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  Subjects -> ENGINEERING (Total: 2266 journals)
    - CHEMICAL ENGINEERING (190 journals)
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    - ELECTRICAL ENGINEERING (100 journals)
    - ENGINEERING (1197 journals)
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ENGINEERING (1197 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 14)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 207)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 1)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 4)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 6)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 3)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 18)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 22)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 7)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 13)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 34)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 28)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access  
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 5)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 6)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 4)
Applied Sciences     Open Access   (Followers: 3)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 8)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 7)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 9)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 24)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 8)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 4)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 1)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 4)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 3)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 4)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 10)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 13)
City, Culture and Society     Hybrid Journal   (Followers: 20)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 4)
Coastal Engineering     Hybrid Journal   (Followers: 10)
Coastal Engineering Journal     Hybrid Journal   (Followers: 3)
Coatings     Open Access   (Followers: 2)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 23)
Composite Interfaces     Hybrid Journal   (Followers: 5)
Composite Structures     Hybrid Journal   (Followers: 241)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 174)
Composites Part B : Engineering     Hybrid Journal   (Followers: 215)
Composites Science and Technology     Hybrid Journal   (Followers: 160)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 25)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 7)
Control Engineering Practice     Hybrid Journal   (Followers: 40)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  
Current Applied Physics     Full-text available via subscription   (Followers: 4)

        1 2 3 4 5 6 | Last

Journal Cover Advanced Engineering Forum
  [4 followers]  Follow
    
   Full-text available via subscription Subscription journal  (Not entitled to full-text)
   ISSN (Print) 2234-9898 - ISSN (Online) 2234-991X
   Published by Scientific.Net Homepage  [14 journals]
  • Preface, Committees
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21



      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Comparing Sliding Block Procedures for Displacement-Based Design of Earth
           Structures in Light of Major Chilean Earthquakes
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Juan Carlos Tiznado, Maria Paz Silva, Natalia Viejo
      Current practice for seismic design of earth structures considers the use of displacement-based methods, which allow a quick and quantitative estimation of the movement of soil masses under earthquake loading. This type of procedures are aimed to establish a relationship between (i) the main earthquake parameters, (ii) the critical acceleration, and (iii) the corresponding permanent displacements of the soil structure. In this sense, based on the well-known Newmark’s sliding block method, several regression models intended for design purposes have been proposed during last decades. However, the selection of an appropriate method to predict the expected permanent displacements of a soil mass remains a difficult and somewhat arbitrary practice. In this paper, strong-motion records from four major Chilean earthquakes, grouped by soil conditions, are used to compare and evaluate the suitability of the reviewed methods for assessing the seismic performance of earth structures. From the results obtained, general conclusions and recommendations for practical applications on sites with similar characteristics to the Chilean subduction zone are elaborated.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • A Study Regarding Smoke Exhaust from an Atrium Type Building in a Fire
           Situation
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Zeno Cosmin Grigoraş, Dan Diaconu-Şotropa
      This paper presents the analysis of the effect of smoke exhaust and hot gases from an atrium type building using techniques for numerical simulation of a fire situation. Several scenarios regarding smoke exhaust are considered for that purpose and the variation of the following parameters is monitored: minimum and maximum temperature of hot gases as well as the smoke layer height inside the atrium. Using engineering techniques, the development of fire, in compliance with the European legislation has been modelled, by means of a specialized computer program in order to simulate the phenomena of both the fluid flow and the heat transfer manifested in a fire situation.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Experimental Study of Partially Masonry Infilled Reinforced Concrete Frame
           under Lateral Loading
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Prachand Man Pradhan, Ramesh Kumar Maskey, Prajwal Lal Pradhan
      The partially infilled frames are considered vulnerable in terms of captive column effect for the events of earthquakes. Many reinforced concrete buildings have been affected due to captive column effects. Experimental study has been done to verify the captive column effect and its failure modes for partially infilled frames and the results have been compared with the ones obtained for a bare frame subjected to lateral loading. The results of experimental study have also been compared with some analytical results and the verification of equivalent strut width proposed by one of the authors has been done. From the experimental point of view, it is understandable that due to lateral loading to partially infilled frames, the damage pattern is diagonal and the failure of column occurs at the column-wall joint at the upper side of the wall. It is also seen that for fifty percent partially infilled frames, the stiffness of bare frame is enhanced slightly, however, the failure in the column during lateral loading indicates that the columns are subjected to high shear due to the presence of partial infill.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • External Fire Spread Analysis
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ruxandra Dârmon, Mircea Suciu
      The fire safety regulations in Romania require that in case of a fire occurring into a building, it should be prevented to spread to any adjacent structure or neighbouring façade. Apart from the minimum prescribed distances between the buildings, there is no other benchmark or guidance for an approved calculation method to prove compliance with this provision. The British regulations have specified that the heat fluxes on the surfaces exposed to radiation from a fire within the adjacent buildings should not exceed a heat flux of 12.6 kW/m2. The purpose of this article is to review some of the empirical calculation methods for the incident radion flux given in the international literature and to compare their results for a practical aplication.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • RETRACTED: Ground Settlement in Urban Structures Exposed to
           Geo-Environmental and Anthropic Hazards: A Case Study for Galati City
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Cornelia Florentina Dobrescu, Elena Andreea Calarasu, Iolanda Gabriela Craifaleanu
      A case study including a detailed ground settlement analysis is made for a particular loess structure located in the city of Galati, Romania, in order to assess the interdependence of geo-environmental and anthropic settlement triggering factors in the urban system context. In the first part of the study, loess behavior and its effects on built environment are analyzed and discussed based on worldwide historic expertise and current issues. An integrative analysis of loess deposits in natural state, with reference to induced-hydraulic and stress conditions, which was performed by laboratory and in-situ investigations, is then reported. An assessment of basic geotechnical parameters, as well as small-scale modeling of loess settlements at wetting under self-weight were conducted in order to select the most representative experimental area, from the point of view of specific soil structure behavior. Field monitoring surveys were performed to obtain information for quantitative evaluation of settlement time-dependent evolution, by the simulation of excessive moisture. The processing and analysis of experimental data gathered for natural and improved ground conditions revealed that the settlement amplitude of loess deposits with high sensitivity to wetting under self-load can be significantly reduced by the selection of adequate consolidation solutions, based on realistic and undisturbed environmental conditions. The study of soil structure behavior under simultaneous settlement-triggering factors can be integrated in multi-hazard analysis as a support for efficient strategies and mitigation measures, with applicability in the urbanization process, building and foundation design and environmental protection.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Investigation of Plastic Hinge Length in Reinforced Concrete Columns on
           Column Behavior
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mehmet Kamanli, Alptug Unal
      In reinforced concrete buildings in case of a possible earthquake, the buildings slamp as they lost their horizontal stability because of hinging of column ends. The assumptions for plastic hinge lengths are present during project stage of reinforced concrete buildings. According to Turkish Earthquake Regulations, although plastic hinge length is determined to be 0.5h, it's known that plastic hinge length is determined via various formulas in some other regulations all over the world. In reinforced concrete columns, it's necessary to indicate the effect of plastic hinge length on the column behavior. For this purpose, pushover analysis of 5 column samples having different plastic hinge lengths was performed with non-linear analysis program. As a result of pushover analysis, situations of plastic hinges formed in columns and their load-displacement curves were determined. The graphs and the data were compared and the results were discussed.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Probabilistic Risk Assessment for an Art Timber Structure within an Atrium
           Space
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ruxandra Dârmon
      The fire safety objectives are primarily focused on life safety issues. In addition, for particular cases, property protection and business continuity are taken into account when developing Fire Safety Strategies. The purpose of this article is to assess the fire risk associated with a timber structure within an atrium space, carrying out a qualitative and quantitative analysis.For probabilistic risk assessments, the criteria are set such that the probability of a given undesirable event is acceptably low, or As Low As Reasonably Practicable (ALARP). The acceptance criteria vary depending on the fire safety objectives, therefore, for this study, the property protection has been considered beside the life safety of the occupants.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Protection of Greenhouses against Wind Damage
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Georgeta Băetu, Sergiu Andrei Băetu, Mihai Budescu
      The paper presents a case study of a greenhouse building affected by wind loads. The building is a lightweight steel structure with a height of 7.1meters, 12.8 meters wide and 171m long. The roof of the building is a lattice cupola. The main purpose of the authors was to find solutions in order to reduce wind loads on the building envelope, using some wind protection barriers. In order to identify the optimal solution, different types of wind barriers were analyzed. Using Ansys CFX, the authors carried out numerical simulation for each type of wind barrier, in order to find out which reduces the most the wind pressures on the walls and on the roof of the analyzed building. The results provided by numerical simulation of wind action on the building were used to make a comparative study between different patterns of wind fences. The comparison between pressures developed on the walls and roof for each type of fence, has allowed the choice of an optimal solution that can be applied also to other similar buildings.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Specific Behavior of Circular Metal Silo
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Alina Elena Toma, Gabriela Maria Atanasiu
      In the current economic climate, agriculture has started to become one of the main areas of economic activity, including economically powerful states. One of the main problems in this industry is lack of storage space and maintaining quality of grain. Storing grain in silo structures ensure their high quality, efficient protection against the factors that lead to damage and allows keeping all season long and against climatic factors. Take into account the demands of modern agriculture productivity and high efficiency, silos have such an important economic role in the industry. The silos are in the top of industrial equipment that might experience during the lifetime cycle structural failure. Among the causes of structural failure it might be also the effect of seismic action. The silos located in seismic areas are exposed to extreme seismic loads. This paper presents the FE analysis results of the behavior of a circular metal silos located in seismic areas, taking into account the interaction of the granular material stored with the silo wall. The simulation of the contact surfaces of granular material and silo wall have been done based on Drucker - Prager model, available in ANSYS software vs.1.5. Influences of granular material characteristics stored up shall be also investigated and the results are highlighted in this paper.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • STM Modelling Methods of Structural Discontinuities
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Vasile Murăraşu, Vasile Mircea Venghiac
      This paper presents Strut and Tie Method (STM) general modelling principles of discontinuity zones of structural members. In order to increase the precision for determining the bearing capacity of reinforced concrete beam ends, the possibility of simultaneously using two complementary versions of STM modelling of these extremities, statically determinate, complying with Eurocode 2, is analysed. To highlight the precision and simplicity of simultaneously applying the two modelling versions a numerical analysis is carried out, where the methodology is presented in detail.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Structural Simplicity vs. Robustness in the Progressive Collapse Risk
           Assessment of a 13-Story RC Framed Structure
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Teodora S. Besoiu, Adrian M. Ioani
      In the present study, the effect of the structural simplicity on the progressive collapse resistance of a 13-story RC framed building is assessed. The existing structure from Brăila (a zone with high seismic risk from Romania) designed in 1972 according to the former seismic code P13-70, was re-designed in accordance to the provisions of the current seismic code P100-1/2013. The original building consists of beams and columns with different cross-sections along the height of the structure. To achieve the objective of this study, a new model with constant cross-sections was designed according to the current seismic and structural concrete codes. Following the provisions of the GSA (2003) Guidelines, nonlinear dynamic analyses are performed using the Applied Element Method incorporated in the ELS® computer software. It was shown that, under the standard GSA loading (DL+0.25LL) the both two numerical models of the 13-story building are not expected to fail when a first-story corner column is suddenly removed. To estimate the ultimate load-bearing capacity of the structural models, a series of nineteen nonlinear dynamic analyses are carried out. The robustness analyses indicate that, the model with different cross-sections can sustain a maximum load 16% larger than the model with constant cross-sections along its height.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Study Concerning the Level of Seismic Risk in Iasi Municipality
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Georgiana Bunea, Cornel Doniga, Gabriela Maria Atanasiu
      Throughout its history, Iasi municipality has been subjected to many important seismic actions caused by earthquakes produced in Vrancea area, Romania. The impact of these extreme events upon the town increased in time as it developed, more buildings were constructed and the population density rose. The classes of buildings identified in Iasi municipality have been designed on different seismic standards, some of them being erected without taking into account the effect of seismic actions. The differences between the seismic norms’ regulations and the important earthquake’s history some of the buildings have, are outlining the need of seismic risk assessment in Iasi municipality. This paper aims to present some of the results of the seismic risk study in Iasi municipality, which was based on the completed seismic risk surveys and on the regulations of seismic standards. In this study, only the dwelling structures built before 1990 were considered, and the results were distributed on neighborhoods, for obtaining a general perspective on the seismic risk state of each area, by considering the buildings’ seismic vulnerability.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Study of the Negative Effects of Railway Transport Systems upon
           Constructions
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Raluca Nerişanu, Delia Drăgan
      This paper presents the negative effects of the vibrations produced by railway transport systems upon the constructions in the neighbourhood of the railways. The railway vehicles in motion produce very high intensity vibrations. Through the soil, these vibrations are transmitted to the foundations of the constructions in the vicinity and consequently settlements, cracks, even collapses of buildings can occur. The paper contains a theoretical part where the features of free and forced vibrations of the track/vehicle system as well as the features of the vibrations of the vehicles displacing along a joint track are described, followed by a practical part in which are shown the results of measurements made to highlight the effects upon the constructions (values of accelerations, velocities and displacements).


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Case Study on Modeling Fire Action Complexity in Fire Safety Engineering
           of Structures
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Constantin Sorin Scutarasu, Dan Diaconu-Şotropa, Marinela Barbuta
      Important goals in the fire safety design, such as preventing loss of life and goods damage, are achieved by maintaining the stability of structures exposed to fire for a period of time established by norms and standards. Real fire scenarios confirm that the specific technical regulations which actually have a prescriptive character (both national and international) do not deal with sufficient possibilities regarding the assessment of structural fire safety. The new approach on structural safety, based on engineering notions, gives us additional prospects on it and it is included in the issues of the fire safety design of structures. A relatively new field of study, known by a few professionals focused on fire safety (but well acknowledged in the research area), fire safety design met with lots of changes and restructuring of the governing concepts and procedures and of the information with which they operate, due to the fast accumulation of experience in this area of engineering activity. Consequently, after countries such as Australia, Canada, New Zeeland or USA provided towards professionals specific technical regulations for fire safety design, groups of experts in these aforementioned countries have joined their forces to try to diminish the differences that exists between those regulations and to give a unitary character to them, a better conceptualized engineering approach of the fire safety design. The result: occurrence of the publication International Fire Engineering Guidelines (last edition from 2005). The systematic approach of fire safety design in constructions pointed, once again, the possibility of modular organization of this field of study, the relations between modules being established according to the objective or objectives in the fire safety design for a specified building. This article aims to put forward, from this modularized perspective, the study of the fire safety design of a building exposed to fire; hence, the practical part of the article exhibits the numerical simulation of initialization and development of the fire process for a large scale religious building. The main features of the building represent the amount of space that facilitates the spreading of smoke and warm gases and which increases the risk of damaging the structural reinforced concrete elements. Application calls to specific numerical simulation with a higher degree of credibility, such as those realized by the FDS (Fire Dynamics Simulation) software.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • System and Subsystems Used in the Engineering Approach of Human Evacuation
           in Case of Fire
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Zeno Cosmin Grigoraş, Dan Diaconu-Şotropa
      The new approach of human evacuation in case of fire, the engineering one, offers additional possibilities of assessment for this activity included in the issue of fire safety of buildings. Being a relatively new field of study, less known to professionals specialized in fire safety (but quite well known to specialized researchers), fire safety engineering undergoes permanent reorganization at the level of concepts and procedures, information by mean of which it operate, due to the rapid accumulation of experience in this area of engineering activity; therefore, after countries such as Australia, Canada, New Zealand, USA have provided to their specialists normative regulations specific to fire safety engineering, groups of specialists from these countries have joined their efforts to try reducing the differences between these regulations and give a unified, better conceptualized approach to fire safety engineering. The result: the development of International Fire Engineering Guidelines (last edition 2005). The systemic approach to fire safety in buildings outlined, once again, the possibility of modular organization of this field of study, the relations between modules depending on the objectives followed in a fire safety analysis for a specified building. This article intends to present in this modularized perspective, human evacuation in case of fire from a building designed for higher education, with a centrally located atrium.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Considerations on Using the Strut and Tie Method for Modelling Coupling
           Beams
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Vasile Murăraşu, Vasile Mircea Venghiac
      This paper presents a synthesis of the numerical analyses regarding the method of modelling the coupling beams of structural walls. The directions of the struts and ties are established according to the results obtained after a linear-elastic finite element analysis. The results obtained after modelling using the Strut and Tie Method, with the struts and ties oriented along the diagonals of the coupling beam, coincide with the results obtained by applying the theory provided by EC8, which proves the viability of the method. This is also confirmed by the results obtained after a non-linear analysis was carried out in the LUSAS finite element environment.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Parameter Estimation of FE Model of a Bridge Using Identification System
           Assisted by Paris Software
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Lăzărică Teșu, Gabriela Maria Atanasiu, Cristian Claudiu Comisu
      Recent studies in the field of Structural Health Monitoring SHM using nondestructive test NDT have shown promising applications for parameter estimation methods based on finite element FE models of bridge structures. Using measurements data, carried out during the experiment on real bridge structures, in situ, one can estimate the structural parameters of the bridge. These parameters can be used further in the process of model updating, model verification, structural evaluation and damage assessment. This paper aims to determine the structural parameters using the PARIS approach from a simulated FE model of a real bridge structure subjected to a typical bridge damage scenario. The MATLAB computer based program, entitled PARIS PARmeter Identification System used for the study case illustrated in this paper is applied for the Finite Element FE model updating of a reinforced concrete bridge, located in Iași municipality. PARIS software takes advantage of the Application Programming Interface API of a standalone structural computing software allowing to perform the necessary computational steps for the model updating process. In the same time the application of this software, recently developed by Prof. Masoud Sanayei permits the use of static and modal measurements, as input data, for the estimation of stiffness and mass parameters at the element level of the bridge. The obtained results of the updated model are useful in the process of further validation of a simulated damage test data. Finally, the results based on FE model parameter estimation can be useful for the structural health monitoring and condition assessment process of the bridge structure.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • The Study of Butt-Welded Connections after Fire Exposure
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Teofil Florin Galatanu, Georgeta Băetu, Christiana Cazacu, Dorin Radu, Radu Muntean, Florin Tamas
      The paper presents a study of fire behaviour of butt-welded connections taken into account the post fire conditions and the possibility of welding strengthening of fire exposed structures. The need of in service life of a steel structure after being exposed to fire raises the problem of strengthening or replacement of some structural elements. The degradation of steel properties with increasing temperature is considered according to Eurocode 3: Part 1-2 provisions. Following the experimental part, the behavior of the welded connections after fire exposure was compared with the original behaviour at the ambient temperature. The results and conclusions can be used for damage assessment and strengthening technique of post fire steel structure.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Analytical Procedures for Calculation of Horizontal Displacement of Timber
           Shear Walls
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ion Florenţa, Nicolae Ţăranu, Alexandru Secu, Ana Raluca Roşu, Dragoş Ungureanu
      The shear wall horizontal displacement is one of the most important parameters involved in the seismic design of the timber framed structures. This paper presents the fundamentals of displacement-based seismic design, along with a description of the requirements for its application: checking of the maximum allowable displacement, checking of the buildings’ separation and determining the stiffness of the walls. The horizontal displacement of a shear wall is determined through the analytical calculation of the wall elements’ displacements. For timber framed structure, the International Building Code (IBC), recommends analytical models for the determination of the horizontal displacement. However, the European norm, Eurocode 5 does not provide any calculation model for the lateral displacement. A comparative study of the available analytical models and the corresponding results are presented in this paper.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Artificial Neural Network Applied to Prediction of Buckling Behavior of
           the Thin Walled Box
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Florin Susac, Elena Felicia Beznea, Nicuşor Baroiu
      Composite materials are mostly used in applications where stiffness-to-weight or strength-to-weight ratios are critical. For example, there can be produced a large number of acceptable designs that support a specific loading condition by varying fibre orientation in each ply, or in a certain number of plies. Due to ease of construction, structural elements, such as box structures, are widely used as a load bearing member in the fields of civil, mechanical and aeronautical engineering. The paper presents an analysis of finite element stability of a thin-walled structure which can be used in civil constructions. The structure is made of FRP composite material. The structure is stiffened with ribs which are made of the same composite, steel and aluminum. The critical buckling pressure was determined for this structure. The advantage of using FRP and sandwich composite, compared to conventional materials as steel or aluminum, consists in high strength to weight ratios, high corrosion resistance, lightweight and excellent fatigue performance. A neural network model was created and used for the prediction of stability behavior of the analyzed elements.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Determination of Internal Forces Using Artificial Neural Networks
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Alexandrina Elena Pandelea, Mihai Budescu, Lucian Soveja, Maria Solonaru
      Design and verification of engineering structures require knowing the numerical values ​​of sectional internal forces as close to reality, considering that the intervention construction works are correlated with these values.Most of the computer programs are working with finite element method, which was designed by engineers and founded by mathematicians. After running the computer program, stresses and deformations maps are generated as results.Considering these results, using artificial neural networks, a computer program has been designed, which is able to determine internal forces of a section, namely axial force, shear force and bending moment.Neural network input parameters consist of color maps resulted from numerical modeling, numerical values ​​of the normal and tangential tensions and dimensions of the structural element.This procedure is particularly useful when using finite element programs that do not have the ability to determine sectional internal forces.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Evaluation of Classical Models for Thermal and Moisture Transport in Stone
           Walls of Historical Buildings
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Iuliia Redikultseva, Dashnor Hoxha, Naima Belayachi
      This paper concerns the evaluation and the validation of a heat and moisture transfer models in stone walls using in situ measurements on an instrumented wall. Firstly, a pure thermal (respectively moisture) diffusion problems are considerate, then this problem was combined with convection on the external edge of model. It is found that, despite of an uncoupled approach, the nonlinear thermal diffusive model performs quite well and reproduces perfectly the measured temperatures. It is the same for the convective-diffusive thermal problem, where the temperature on the surface wall is also reproduced quite well. An improvement of this second type problem results could be expected by taking into account the radiation. Otherwise, the both cases of moisture transfer problem (purely diffusive or diffusive-convective problem) are ill-simulated by the Kunzel’s model.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Experimental Test and Numerical Analysis of Old Masonry Walls Strengthened
           with Glass Fiber Reinforced Mineral Composite
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): George Taranu
      Masonry structures are commonly used in Romania and not only. This is due to its many advantages in terms of mechanical behavior based on increased capacity of stress redistribution. In addition to traditional strengthening solutions, composite materials are an advantageous alternative due to the high strength versus weight ratio. This paper presents an experimental and numerical analysis on old brick masonry specimens made with weak lime mortar and limestone sand, subjected to uniaxial compression. The results were compared with finite element numerical analysis in order to show stress distribution between brickwork and strengthening layers applied. Several forms of strengthening application relative to masonry faces (interior and exterior) were considered in the numerical analysis. The beneficial effect on the mechanical behavior of strengthened masonry in terms of stress and strain distribution of both masonry and strengthening layers is shown to be dependent on the thickness of the strengthening layer.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Influence of Limited Excavation under the Foundation of an Existing Church
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Maria Solonaru, Mihai Budescu, Irina Lungu, Lucian Soveja
      The objective of the present paper represents the optimization of the excavation dimensions within underpinning works. Stress variations within the structural walls of an existing masonry church have been observed and interpreted for different lengths of the excavation section, in order to optimize the section length and to not exceed the allowable deformation limits. In this respect, nonlinear static analyzes using finite element program ANSYS Workbench have been performed, considering soil-structure interaction, for limited excavations that take place underneath the existing stone masonry foundation, laying on a multi-layered soil.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Influences of Repair Materials Properties on Reinforcement
           Corrosion-Induced Cover Cracking Time
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Wanchai Yodsudjai, Ponpan Setpittayakul
      Cover cracking from reinforcement corrosion is one of the major causes of deteriorations in reinforced concrete structure. If the cover cracking time can be predicted, it would be useful for maintenance planning and budget allocation. The objective of this paper was to find the influence of repair materials on concrete cover cracking time. In this study, the corrosion of concrete reinforcement was accelerated by electricity. Using three types of materials, it was found that the cover cracking time of repair mortar was the shortest followed by those of concrete and non-shrink cement grout respectively. In addition, specimens simulating repaired concrete were prepared. The cracking times of the repaired specimens were found to be about the same and were of the same order as those of repair materials only.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Structural Reliability Solutions of a Ground Floor Building under Limited
           Interventions Conditions
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ioan Tuns, Marius Mantulescu, Teofil Florin Galatanu
      Any building must ensure safety conditions during the exploitation, at the level of designed exigencies, throughout the entire lifespan. The completion degree of the structural performance requirements, in the given exploitation conditions, results following the assessment of the technical state of the building. This paper presents a case study performed on an industrial “ground floor” type building, with the purpose to assess the exploitation safety level for the constituent structural elements and engineered consolidation measures. The structural reliability solutions have been designed in compliance with the execution possibilities limited by the existing of ventilation tubing , of big dimensions , made in France, of ,,polyester reinforced with glass fiber’’, which is situated along columns of axis A, at 30 cm approximate and the owner cannot to interrupt the technological process during the works.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Structural Rehabilitation Analyses for a Romanian Cultural Heritage
           Building Located in Seismic Area
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Vasile Mircea Venghiac, Cerasela Panseluţa Olariu, Mihai Budescu
      Structural rehabilitation, especially of historical monuments, is a difficult and widely treated subject in order to achieve a better insight regarding their seismic response. In Romania, a lot of historical monuments that require rehabilitation due to seismic actions are encountered. This paper aims to assess the effects of structural retrofitting on a historical monument located in Botoşani County, which withstood during its life cycle important earthquakes. The 20th century monument is located in a seismic active area of North – Eastern Romania, at a distance less than 300 km from Vrancea region where the epicenter of major earthquakes for the Eastern Europe is situated. Two hypotheses for the FE model of the structure were considered, namely with and without the rehabilitation solution. Nonlinear FEM analyses were performed in computer software environments. Using specific modeling tools of the computer program it is intended to simulate linear behaviour of masonry and global response of the structure. Comparisons between the two models were made. The results are used to validate the rehabilitation solution also consisting a source of information for its effects during structural lifetime cycle of the historical church.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Coatings Innovations on the Inner Shell of Metal Grain Silos
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Alina Elena Toma
      Some of the current research concerns the development of sustainability metallic silos study, highlights aspects of the treatment methods of the inner surface of the silos against the corrosive flow effects of granular material. By repeating the cycle of loading - unloading of granular material silo may lose bearing capacity due to the fatigue phenomenon. As a result, corrosion protection is required because of the silos can lead to a longer lifespan. Studies in this area aimed at finding new protection solutions, compatible with the granular material in store. In the field of metal silos, one of the innovative solutions, it consists of applying a protective coating on the inner wall layer made from ceramic powders and a composite material consisting of a resin reinforced with a specific curing agent. It is obtained such a protective steel with ceramic, applicable for walls silos, basic requirement consisting in achieve a interdiffusion physical, chemical or electrical between the two materials and the production of a minimum residual voltage at ceramic interface. The methodology for creating adhesion to metal-ceramic is described in this paper.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Effects of Marble Waste on Properties of Polymer Concrete
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Marinela Barbuta, Adrian Alexandru Şerbănoiu, Costel Cadere, Catalina Mihaela Helepciuc
      The quantities of wastes, generated in industry are increasing every year. Their utilization became a priority for solving pollution problem and save energy and resources. The wastes are investigated as materials for obtaining new concretes with different applications. Polymer concrete is a composite material, in which the aggregates of different sorts are bound together by a resin. As in the case of cement concrete, different types of wastes (slag, glass, marble, etc.) can replace the aggregates or they can be added in the concrete composition as filler (silica powder, fly ash, calcareous powder, etc). The use of wastes presents some advantages such as: obtaining of new products at lower prices, in some cases with improved properties; consuming of wastes helps to clean the environment; preservation of natural resources which are replaced by wastes; etc.In the experimental study, marble waste is used for obtaining epoxy polymer concrete. The effects of this type of waste on the mechanical properties of polymer concrete were investigated. Two types of concrete were prepared: one with powder of marble as addition and the other type with aggregates of marble waste. The mechanical properties (compressive strength, flexural strength, split tensile strength) were experimentally determined and compared with the characteristics of epoxy polymer concrete (considered as reference mix). The microstructure of polymer concrete with marble waste was analyzed by SEM images. The marble waste influenced the mechanical properties of epoxy polymer concrete. Higher values of mechanical properties were obtained when the marble was used as aggregates. As addition in epoxy polymer concrete, the dosage and finesse of marble had influenced the values of mechanical properties.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Fiber-Reinforced Mortar Incorporating Pig Hair
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Gerardo Araya-Letelier, Federico C. Antico, Pablo Fernado Parra, Miguel Carrasco
      Recycled fibers from food-industry could be added as reinforcement to cement-based materials. Cement-based materials perform well under compression, but tensile strength and post-cracking ductility in tension are poor. Fibers produced from steel, glass and synthetic materials, have been successfully used to overcome some of these shortcomings. Fiber-reinforced mortar has shown an increased post-cracking ductility and improved long-term serviceability due to the crack control provided by fibers. Food-industry waste disposal is globally a major concern because of its environmental impacts. For these reasons, the use of recycled materials in construction applications has been investigated over the last decades.
      This investigation deals with the incorporation of pig hair, which is a waste produced by the food-industry worldwide, in fiber-reinforced mortars. This composite material is intended to reduce the environmental impacts by valuing waste materials in construction applications while improving mechanical properties. To determine compressive, flexural and impact strength, bulk density, porosity and dynamic modulus of elasticity laboratory tests were conducted in mortar specimens with 0%, and 2% of pig-hair content in weight of cement. The results of this research show that the impact strength can increase up to five times when compared to plain mortar. Moreover, the compressive and flexural strengths, bulk density, porosity and the dynamic modulus of elasticity of fiber-reinforced mortar, with the aforementioned pig-hair content, are not significantly affected.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Experimental Assessment Techniques for the Dynamic Properties of Concrete
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mihai Sergiu Stratulat, Oana Mihaela Banu, Ana Maria Toma, Petru Mihai, Ionuț Ovidiu Toma
      Recent progress in measurement techniques have given rise to increasing interest in non-destructive testing. Incorporating non-conventional, recycled materials in concrete (i.e. rubber crumbs from discarded tires), the heterogeneity is increased. Based on this, it is of importance to determine to what degree the accepted protocols, valid for traditional materials, are applicable to newly developed construction materials with particular interest to rubberized concrete. Several tests, including parameters missing from the standardized measurement techniques, such as the increasing rate of the frequency during the sweep for finding the resonant frequency of the specimen, were conducted on two types of concrete: traditional and rubberized concrete. The assessment of the dynamic properties was done by means of the forced vibration method and the impact method. The obtained results indicate the fact that current procedures should be applied with care when considering aggregate replacement in traditional concrete by other recycled materials.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Numerical Analysis of GFRP Interposed Lamella Effect on the Structural
           Behavior of Timber Beams
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Emanuela Decher, Cristina E. Lanivschi, Gabriela Maria Atanasiu
      The use of numerical methods to simulate materials or civil structures behavior is an efficient tool to predict their performance in diverse specific applications and design situations. The authors propose a set of numerical parameters able to describe the effect of the two interposed GFRP lamellae on a structural member composed of three wood battens connected lengthwise with mechanical fasteners, further considered as the reference beam.
      The numerical simulation is carried out in several steps. Firstly, the numerical model is calibrated with the experimental test of the reference beam. Secondly, the two GFRP lamellae are introduced between the timber members and the stress state and deformations both in cross-section`s components and at their interface are examined.
      The material models used in simulations were chosen according to the type of efforts that occur in timber beams and their failure modes when subjected to bending. For the timber components an orthotropic material model was considered. For the GFRP components linear elastic until failure material model was introduced. The interfaces between timber/GFRP lamellae were modeled by using cohesive zone material model with separation-distance based debonding.
      The results show a good correlation with those experimentally obtained and the parameters provided by this numerical analysis may be reliably used for specific design situations.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Hygrothermal Behavior of Clay - Sunflower (Helianthus annuus) and Rape
           Straw (Brassica napus) Plaster Bio-Composites for Building Insulation
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Yoann Brouard, Naima Belayachi, Dashnor Hoxha, Stéphane Méo, Wajih Abdallah
      The aim of this experimental investigation is to study and compare hygrothermal properties of different materials based on vegetable aggregates and clay in order to prove the performance of the developed composite in the framework of BIOCOMP project. Crude earth is known to have very high capacities to regulate indoor humidity. Vegetable aggregate is characterized by high porosity leading also to very effective natural indoor climate regulators. Then, we expect the mix of these two material will to produce an insulation bio-composite with enhanced thermal and hygroscopic performance. Sunflower stem, rape straw and clay used in this investigation are considered as a very low carbon footprint because they are real local agricultural byproducts. Clay-sunflower and rape bio-composites seem to be appropriate and effective biobased insulating plasters, further investigations must be performed in order to characterize more accurately their interesting hygrothermal properties as long as the acoustical and mechanical aspects. Samples have been manufactured with four different vegetable aggregates (rape straw, sunflower bark, sunflower pith and a mix of sunflower pith and bark) at a same binder/aggregate ratio. The same clay soil is used as a binder for the four bio-composites. The thermal properties for the different bio-composites were obtained from the thermal conductivity measurements after various relative humidity, in order to evaluate the impact of the water content on the thermal parameters. For the hydraulic properties, the sorption-desorption isotherms for the four composites are obtained. The results show a significant effect of the different aggregates on the hygrothermal behavior of the bio-composite based on clay.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Experimental Bending Behavior of Glue Laminated Timber Beams
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Vladimir Marusceac, Vlad Mihai
      The aim of this paper is to prove that glue laminated timber is a viable structural material that can easily replace common steel or concrete beams for small and medium spans. It is a much lighter and eco-friendly material with minimal impact on our eco-system by using significantly less energy in it’s production and also by using timber witch is a sustainable material. Experimental four point loading bending tests were conduced on scaled beams according to the EN 408-2010 [1], tests that were meant to study the behavior of these beams under loading and unloading cycles as well as the bending strength and deflection characteristics.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Parametric Study of Structural Performance of Innovative Solutions for
           Hybrid Lintels - Part 1: Input Data for FEM Analysis
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Oana Neculai, Cristina E. Lanivschi, Dorina Nicolina Isopescu, Ionuț Ovidiu Toma, Iulian Zăpodeanu
      The paper presents the analysis of innovative precast hybrid structural elements. The elements are two-layered prefabricated lintels, which are made of AAC (aerated autoclaved concrete) and reinforced concrete, consisting of several hybrid modules used for closing any openings with spans varying between 0.75 m and 3.25 m. The presented study contains the analytical calculus, covered by numerical modelling simulations, which helped determining the modules’ load bearing capacity and support the authors’ conclusion to use these hybrid lintels as structural elements.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Physical and Mechanical Property Characterization of Hemp Shive Reinforced
           Gypsum Composite Board
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Raluca Fernea, Daniela Roxana Tămaș-Gavrea, Daniela Lucia Manea, Claudiu Aciu
      Known and used since Antiquity, the hemp plant comes back to the attention of the researchers focused on making new ecological products used to reduce the environmental impact in the construction sector. A sustainable building environment needs to develop relations with renewable raw materials. This study aims to make an investigation in the products based on gypsum and hemp shives, where hemp shives are an agricultural plant and gypsum a natural resource produced by burning gypsum plaster. Using the multicriterial analysis, the best performing formula is identified, in order to satisfy thermal insulation, sound insulation, mechanical and fire related requirements and in which the variable is the hemp shives percentage in the composite material.
      The three recipes prepared were compared with the normative and other studies. The results presented at the end of this study shows that in terms of acoustic absortion and thermal conductivity, the insulating materials are best when the volume of hemp grows.
      Meanwhile the positive aspect of growing the volume of hemp for insulation materials becomes a disadvantage from the mechanical point of view, where to have high values of strength is recomanded a low volume of hemp.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Self Compacting Concrete Properties of Medium Characteristic Strength
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Aurelia Bradu, Nicolae Cazacu, Nicolae Florea
      Self-compacting concrete is a relatively new material in building industry, able to flow into place under its own weight, filling perfectly the formwork without vibration, avoiding segregation between cement paste and aggregate. The new technology allows to obtain a balance between deformability and stability with similar components of the conventionally vibrated concrete. The use of mineral admixtures provides savings and environmental benefits due to the consumption of by-products. Since its development SCC was widely used in precast industry due to higher powder content necessary to keep the self-compactibility. The use of SCC in situ application remains to be occasionally due to the lack in field research. In this paper are investigated 6 mixtures of SCC with different factorial design w/c ratio, limestone filler content, aggregate skeleton. The fluidity of concrete is attained by adjusted powder content and superplasticiser, no viscosity-modifying admixtures was used. Concrete properties in fresh state are evaluated according to EFNARC, from mechanical characteristic are examined compressive strength on the cube and cylinder specimen at 28 days and tensile strength


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Shear Structural Response of Adhesive Joints for FRP Composites
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Dragoş Ungureanu, Nicolae Ţăranu, Iuliana Dupir, Ion Florenţa, Vlad Lupăşteanu
      Adhesive bonding is a suitable joining technique for composite materials. The thick adherents shear’ tests (TASTs) are common joint-specimen tests performed to determine the adhesive shear properties. This paper presents the results of numerical modelling of several TAST specimen configurations. The numerical models were conceived considering the adherents made of fiber reinforced polymer (FRP) strips and bonded with an epoxy type adhesive. The adhesive layer thickness has varied as 1 mm, 2 mm and 3 mm, while the overlap length has been increased from 50 mm to 70 mm and 100 mm, respectively. Unidirectional tensile load of 500 N, 1000 N and 2000 N are applied and the stress-strain distributions are investigated. The results are presented in terms of total deformation, equivalent stress (von-Mises) and equivalent strain (von-Mises).


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Structural Behaviour Evaluation by Numerical Simulations for Innovative
           Solutions of Hybrid Lintels - Part 2: FEM Analysis
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Cristina E. Lanivschi, Oana Neculai, Dorina Nicolina Isopescu
      The paper presents a detailed analysis on the performance of reinforced concrete (RC)/ aerated autoclaved concrete (AAC) hybrid lintels, studied using finite element method (FEM), through numerical modelling. The analyzed lintels are a combination of modules, made of AAC and RC or pre-stressed concrete, which can be used for closing any span of windows or doors, for any wall thickness. To simulate the hybrid modules lintels in their service state, FEM modelling was used, together with rigorous numerical calculus, in order to better understand their flexural behaviour, the AAC-RC interface area and the way the material properties affect the structural performance of the analyzed lintels.
      The numerical analysis was initiated with validation of the reference model with analytically determined efforts in concrete component of the lintel. A subsequent model was constructed by adding the steel reinforcement and AAC component to the reference model. The analysis was conducted for two scenarios of a perfect and possibly very weak bond of RC/ AAC interface on “bonded interface model”, BIM and respectively “frictional interface model”, FIM models. The results showed that steel reinforcement had greater effect on the lintel`s stiffness than AAC component, while the effect of AAC is almost cancelled in the case of a weak bond of the interface. Future investigation needs to be developed considering an analytical model based on FIM model calibrated with laboratory measurements.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Structural Response of Sandwich Beams with Different Facing Materials
           Subjected to Bending
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Iuliana Dupir, Nicolae Ţăranu, Cristina Vlădoiu, Dragoş Ungureanu, Vlad Lupăşteanu
      Sandwich elements with structural functions are widely used in engineering applications, offering outstanding advantages, such as high strength and stiffness compared to its low specific weight. The sandwich elements consist in two stiff and thin faces, separated by a thick and lightweight core. A numerical analysis is performed in this paper, in order to evaluate the flexural structural response of sandwich beams with foam core and various facing materials. It has been noticed that the deflections decrease when the stiffness of the facings increase. The results are represented in terms of maximum deflections and direct stress distributions.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Studies Regarding the Shear Correction Factor in the Mindlin Plate Theory
           for Sandwich Plates
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mihai Vrabie, Radu Chiriac, Sergiu Andrei Băetu
      The displacement field from the first-order shear deformation plate theory (FSDT) extents the cinematic aspect of the classical theory of laminated plates (CLPT), including a transverse shear deformation, considered constant on the plate thickness.
      In order to correct this aspect, in FSDT (named also the Mindlin plate theory) a coefficient Ks was inserted, named shear correction factor, used as a multiplier in the shear stiffness equation of the plate.
      In this paper are presented the most popular methods for determination of the shear correction factor, identifying the differences between them.
      To emphasize the influence of the shear correction factor on the stress response, a numerical parametric study was done on some sandwich plates filled with polyurethane foam. The processing of the obtained results allow drawing some conclusions useful in the designing of this type of sandwich plates.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Using the Waste of Polyester and Glass Fiber in Cold Recycling Highways
           Superstructure
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mihai Liviu Dragomir, Andrei Florin Clitan, Nicolaie Pop
      This paper wish to make a presentation of the possibility to use glass and polyester fiber waste in making highway cold recycling better, easier and cheaper. For this purpose we have studied the influence of the fibers (glass and polyester) on some experimental sectors, from our country, Sălaj district, Transylvania. Glass and polyester fiber waste can be used like disperse reinforcing materials in highway superstructures in so called cold recycling technology. The fibers are throughput in the matrix for better physical and mechanical properties of the final product. This technique will give better highway surface, cheaper costs per rehabilitated kilometer and diminution of the waste that some industries are making.Most studies from this scientific sector are gravening above the realization of brand new superstructures ignoring the possibility to recycling the existing layers with or without other materials in addition. The period that we are passing is one characterized by intense preoccupations oriented on the economically aspect, much more over the big investments like are highways and bridges - were the cheaper solution is the winner.There are some problems in spreading and dosage of the fibers in the system to ensure the reinforcing function. For the recycled complex (aggregates, bitumen, cement, water and fibers) we will use the generically denomination of matrix. The improvement of physical, mechanical and chemical properties of the matrix constitutes problems that are hard to solve in a very short time. Regarding the fibers the biggest problem is the dosage and homogenization in the structure. To attend this purpose fiber need to have the correct length ant the correct spread in the matrix.We had make a bibliography documentation, that encourage us to believe that using some alternative solutions will obtain very good results also in our country, that have the well-known problems regarding its highway infrastructure.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • A Comparative Study of Hydromechanical Properties in Saturated and
           Partially Saturated Conditions of Two Soils from the Runway of Oran
           Airport
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mohamed Chikhaoui, Dashnor Hoxha, Naima Belayachi, Ammar Nechnech
      This study concerns the ground soils of the second runway of the Es-Sénia airport in Oran (Algeria). This airport was built on a very complex hydro geotechnical site when underground cavities, following the dissolution of gypsum soil, were found during the before-construction geologic studies. Several, techniques are used in laboratory (Permeability, triaxial compression tests at various confining pressure, and hydric tests in saturated and unsaturated conditions) and for in situ it’s used the results of SPT and pressure-meter tests. A comparison of parameters of two soils identified in saturated and partially saturated conditions by in situ and laboratory tests was performed in order to respond to questions of the similarity of hydro mechanical properties of two soils as well as their statistical representativeness of the in-situ reality. It is found that, in respect to the studied parameters, laboratory results are statistically significant and reconstituted soils is statistically representative of natural soil reconstitution.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • An Approach to Identify the Impact of Human Intervention on Major Defects
           in Road Design, Construction and Maintenance
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Andrei Boboc, Ancuţa Rotaru, Vasile Boboc, Gupinath Bhandari
      The need to build and run roads offering structural integrity led to great advances in the fields of material sciences and fracture mechanics, but construction defects occur to either the new roads or the old ones. There are generally four categories of construction defects referring to roads: construction deficiencies, design deficiencies, material deficiencies, and subsurface deficiencies, but it is not uncommon for a design deficiency to link on to construction deficiencies in the structure.The paper aims to emphasise that people think different about hazard and safety especially when they build roads. Differently put, roads rely more heavily on their makers and users to limit both the occurrence and impact of human error in construction and maintenance on the one hand and to rectify and rehabilitate on the other hand to improve the safety performance of road transport systems and keep accidents from occurring.The paper aims to provide information about the defects occurred in the road construction and maintenance affecting human safety bringing forward practical examples. Moreover, it examines the materials widely implemented in the road construction from the viewpoint of their technological restraints and possible deficiencies. It also analyses some of the methods used on fields about how they might positively influence the road reliability and the human security implicitly.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Changes in the Basic Index Properties of Clays in Relation to the Content
           of Diatoms
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Pavlína Frýbová, Alexandra Erbenová, Věra Glisníková, Radka Drápalová
      In the framework of the research project of the Technology Agency of the Czech Republic TA 02011350 “Investigation of properties of diatomaceous clays and methods for improving their structure", clay properties have been investigated depending on the content of diatoms. To investigate the effects of diatom microfossil content on the index properties of clay soils, measuring tests were performed on cohesive soils with different diatom microfossils content.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Bridging New Solutions for Sustainable Rehabilitation of Structures
           Damaged due to Difficult Soils or Foundation Design
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ancuţa Rotaru, Gupinath Bhandari
      The paper presents a consolidation solution to a damaged construction due to its emplacement on difficult foundation soils and inadequate foundation design. Because of the long building operation, many difficulties arise out of structures some frequently met being produced by the unequal settlement of soil, incomplete design of foundation systems or adoption of constructive solutions for foundations apart from design stipulations. To carry out the sustainable performance of structures and actual deformations of structures, foundations, and foundation soils, the current characteristics of the materials being used are necessary to be assessed as well as to evaluate and identify the proper measures to bring them up to the imperative level that ensures safe, reliable and efficient operation.
      The paper aims to bring in practical ways for the rehabilitation of structures influenced by the inappropriate foundation design as well as difficult sites presenting not only some real deficiencies arisen in structural elements but also methods and technologies used to enhance the performance of constructions in terms of structural capacity and serviceability.
      The paper shows specific causes that produce structural degradations and the results got from a case study defining two possible solutions emphasising that the consolidation works are specific to each and every building needing experience in expertise, design and execution.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Laboratory Investigations on the Effects of Bacteria on Fine-Grained Soils
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): S. Sowmya, P.S. Meenu, R. Asha Latha, Devendra Narain Singh
      Over the years, the field of geotechnical engineering focused on physical, chemical and mechanical aspects of the geomaterials. However, recent developments in environmental geotechnics have highlighted the impact of biological processes on geo-materials and their performance. Also, the present day geotechnical problems favour biological interventions to develop eco-friendly and sustainable technology. In view of this, the present study is a preliminary investigation on the impact of microbial loading on fine-grained soils. In addition, a protocol has been developed to establish ‘bio-geo interface’ between bacteria and the geo-material. However, long term studies are demanded in this direction for in-depth understanding of the mechanism for development of prospective application.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Settlement Reduction of an Existing Road Earthworks Using Columns Obtained
           by Deep Soil Mixing Method
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Andreea Cristina Bitir, Claudiu Constantin Popa, Vasile Muşat, Nicolae Boţu
      Deep soil mixing methods have been applied at international level for over 40 years on numerous ground improvement projects aimed to enhance the geotechnical performances. The chemical reactions and physical processes which take place after mixing the natural soil with different stabilizing agents lead to an increase in bearing capacity of the ground foundation for new or existing buildings, settlement reduction and/or stability for road and railway embankments, stability and/or seepage control for deep excavations. This paper presents the geotechnical design of columns obtained by mixing the soil with cement slurry in order to stabilize the manifesting settlements of the earth works of an existing road. Considering the geotechnical conditions of the analyzed site as input data, in this paper various dimensions and geometric configuration of the columns are evaluated, with specific purpose to determine an optimal solution that meets the technical performances of the project. The analysis was performed by numerical modeling using the finite element software Plaxis 2D, aiming to evaluate the strain state of both the treated and untreated soil. Although the stabilised elements are usually installed prior to the construction of the road structure, this article highlights the effectiveness of their application even in cases where the road structure already exists.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Prospect for Implementation of Road Infrastructure Asset Management
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Hiroshi Yokota, Kohei Nagai, Koji Matsumoto, Yi Yi Mon
      Infrastructure has to be adequately planned, designed, executed and maintained to keep its structural performance over respective requirements throughout its life-cycle. However, infrastructure suffering from serious deterioration in structural members and subsequent loss in performance have been often found due to various reasons. To meet these facts, it is extremely important to pursue coordination of engineering work in the stages of design, execution and maintenance. The infrastructure management including the concepts of the life-cycle management and the asset management is an organized system to support engineering-based decision making for ensuring sufficient structural performance and long life of a structure at the design, execution, maintenance, and all related work during its life-cycle. This paper deals with infrastructure management system and an example of its application for a road bridge from seriously deteriorated.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Site Soil Investigations for Road Rehabilitation
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Vasile Boboc, Ancuţa Rotaru, Andrei Boboc, Gupinath Bhandari
      The soil investigation performed on site identifies the physical and mechanical properties of the soil under the present road structure as well as the nature and thickness of the road structure to rehabilitate it when the road surface condition becomes poor or defective due to ageing, weathering and road traffic action. The rehabilitation processes re-assess the soil parameters to restore the pavement surface to the required level of service based on the recommendations of the field stratification as well as of the geotechnical characteristics of the studied emplacement.
      The paper presents the soil investigations on site along DN29 Suceava-Botoşani-Săveni-Manoleasa, Km 18+075 section of national road in Romania to get the information on subsurface conditions. The national road DN29 Suceava-Botoşani-Săveni-Manoleasa is covering the north-eastern part of Romania, in Moldavia region. Since its asphalt works in the '70s and '80s, nothing but partial sections of asphalt works has been carried out having never undergone major repairs. Due to external factors such as rain, snow, and traffic, the minor works that had been made make it usable for a short time, the results of soil investigation clearly attesting the rehabilitation priority.
      Some geotechnical characteristics of the national road DN29 Suceava-Botoşani-Săveni-Manoleasa, Km 18+075 section in Romania appear in comparison with those identified on site on the road DN29A Suceava-Dorohoi-Darabani, Km 50+075, in Romania, under a road structure that needed rehabilitation works as well.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Reinforced Earth Retaining Structures - Failure Surface Shape
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Oana Elena Colț
      As an alternative to classical retaining solutions, as gravity or flexible retaining walls, the reinforced earth retaining structures are successfully used. The interaction between the reinforcement and the soil fill and their failure mode as well, are important issues to take into account for the design of these types of structures and the corresponding calculation methods used for their design. From this point of view, an important element is the shape of the failure surface, considered in the design calculation as: plane, circular, etc., which has an important influence on the tensile forces values within reinforcements. This paper presents a new theoretical method for the calculations of the reinforced earth retaining structures and the corresponding results for failure surface shape and for tensile forces in the reinforcements. Considering the similarities between the theoretical results presented in this paper and the experimental results presented in the specialty bibliography, this method creates the possibilities to design in a more economical way, only by taking into consideration the correct interaction mechanism between the soil and the reinforcements


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Stability Analysis of the Earth Embankments Subjected to Natural Cyclic
           Processes
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Smita Tung, Kaustuv Bhattacharya, Gupinath Bhandari, Sibapriya Mukherjee, Ancuţa Rotaru, Vasile Boboc
      The paper brings out the stability analysis of the earth embankments subjected to specific natural cyclic processes such as tides in India and freeze-thaw in Romania.
      The Sundarban, along the Bay of Bengal, is a low tide-dominated deltaic plain of the Ganga-Brahmaputra-Meghna basin (GBM) spreading over India and Bangladesh around 25,500 sq.km. The 3520km of riverside embankments had been erected to protect the deltaic plain from tidal flooding. The tidal cycle in this region is twice high tide and low tide daily. Presently, the Indian Sundarban Delta is under the threat to embankment failure. The study analyses the stability of an 8 m height embankment in the Gosaba region of Sundarban considering a 2m wide earth filled berm at 6m from the bottom of varying clay core thickness under the transient groundwater flow. Pore pressure, Flow net and Phreatic surface have been obtained by numerical models using FLAC 2D software, thus the factor of safety being analysed.
      In Romania, built on the of the highway A1 Orăştie-Sibiu section crossing the clayey hills from Aciliu and Apoldu known for their instability, the embankment around the abutment pier from Apoldu broke up at the entry to the Aciliu Viaduct. The layers of permeable soil soaked with water become heavy instead the waterproof layers keep the water above them creating sliding surfaces. The water is channelled to dozens of springs that appear or disappear depending on each micro-slip or fallen water amount. By freezing the water expands on the ground determining additional efforts, the cycle iterating with each rain and freeze-thaw.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • A Proposal for Controlling Work Progress on Excavation Projects Using
           Digital Photographs
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mauricio J. Toledo, Valeria Isamitt
      Current practice in excavation projects is characterized by a deficient control of work progress that includes estimates of daily work progress by indirect means such as manual records of truck movements, estimates of soil swelling and occasional topographic measurements (usually at start and end of projects). In this article we propose a procedure to calculate earth work volume and progress by using geotagged digital photographs taken at the construction site. This methodology helps construction managers to improve excavation progress control and it systematizes excavation records. The procedure is grounded on literature review, the experience gained from controlled experiments and its application on a case study. With a relatively low effort (approx. 3 hrs.) the proposal enabled us to measure excavation work progress from around 50 geotagged digital photos with a precision of about 8-10% as compared to the traditional excavation volume estimate obtained from truck movement records. Best results were realized for large earth movements recorded on a weekly basis. Precision decreased for small earth movements (e.g., daily work progress control). The proposal includes recommendations for capturing the digital photos; formation of a point cloud model using photogrammetric software; formation of a mesh model and calculation of the excavation volume. Considerations for obstructing construction equipment and complex geometries are included.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Generating Diagonal Braces Used in Pergola and Pavilion Structures
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Liviu Prună, Andrei Slonovschi
      The diagonal braces are integrated part from pergolas and pavilions and have both functional and decorative role. These may have different shapes and, simultaneously, may have distinct inner models. In this paper, the authors propose a method, easy to use, even for the non-programmers that gives the opportunity to build templates for different diagonal braces. The using of such templates gives the possibility to the users to give different dimensions, depending on the specific requirements, of a given diagonal brace. Furthermore, the authors presents a way which gives the opportunity to obtain a 3D model starting from such a template.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Aspects Regarding Geometrical Representation of Quadrics of Rotation
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Alina Angelica Anghel
      The present paper shows the geometrical representation of the ellipsoid of rotation and hyperboloid of rotation and solves certain geometrical problems of them, with applications in technique.The contribution brought by this paper represents the synthesis and comparison between the solving through analytical and descriptive methods of building tangent planes and the intersections of these categories of quadrics with lines.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Study on the Representation in Projection with Elevations of Conoid-Type
           Surfaces
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Delia Drăgan, Dorin Bărbînță, Claudia Pondichi-Alb
      Abstract. Having a remarkable appearance, conoid type surfaces have frequently been used in architecture and constructions. Conoids are part of the category of ruled surfaces. The representation of this kind of surfaces can be performed with one of the following representation systems: orthogonal projection on two planes of projection (Monge projection), axonometry, projection with elevations. The present paper focuses upon the generation and projection with elevations of three types of conoids, namely the Plücker, the Küper and the Viviani conoids


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Study on the Representation of Rotation Quadrics - The Ellipsoid
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Adrian Tudoreanu, Delia Drăgan
      The ellipsoid is part of the family of rotation quadrics, along with the paraboloid and hyperboloid. This paper presents a study on the representation of the ellipsoid surface using various representation manners from descriptive geometry: the orthogonal projection on two planes of projection (the Monge projection), the axonometric projection and the projection with elevations. Every type of representation is exemplified by drawings.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Efficient Ways of Turning to Account Geothermal Energy for Heating in
           Energy Efficient Buildings
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Raluca Paula Moldovan, Gheorghe Viorel Dragoș, Marina Verdeș, Vasilică Ciocan, Marius Costel Bălan, Andrei Burlacu
      Within the present context of the effects of climate changes upon the environment, social and economic framework, but also of the trend of population growth and urban development, ensuring a sustainable, competitive and secure energy development will be possible, primarily, by reducing the negative impact of buildings upon the environment, improving energetic and ecological performances of systems and buildings envelope and promoting renewable sources of energy. In this sense, the paper analyzes, in dynamic simulation regime, performant solutions to reduce the energy consumption for heating energy efficient buildings and greenhouse gas emissions, by harnessing geothermal energy through the use of heat pumps and earth-to-air heat exchangers. The case study starts from an energy efficient building, analyzing the dynamic thermal behavior of the building and then various configurations of earth-to-air heat exchangers in terms of heating potential. For the selection of the optimum solution in terms of coverage of the heating energy demand, different systems combining heat pumps and earth-to-air heat exchangers are studied.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Case Study on Rehabilitation Solutions for Single Family Homes Using
           Eco-Sustainable, Natural, Local Materials
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Constantin Miron, Livia Miron
      This paper synthesizes the results of a research study concerning the use of thermal rehabilitation solutions for single family homes achieved with eco-sustainable, natural and efficient materials.These solutions are aimed mainly at people living in rural areas, who have the ability to execute these works themselves using local materials, often considered to be waste, which are discarded or burned.The research has involved a case study carried out on an old building, with special attention given to natural thermal insulation materials – straw, wool, wood shavings, clay, lime, used in various forms, compositions and application solutions.Combined methods of in situ and laboratory research have been used in order to determine the thermo-physical state and behavior of the thermal insulation solutions made with thermally efficient natural materials available locally.The study has sought to emphasize the durability of natural materials under actual exploitation conditions based on a comparative analysis between the state parameters of the buildings and constituent materials, correlated with conditions of comfort, hygiene, health and thermal energy efficiency.The conclusions of this research yield a usage model for traditional, natural materials based on instructions, and usage and exploitation rules, which take advantage of the building tradition as well as of the new knowledge elements, allowing for the development of a built fund with local, renewable resources and with the least possible expenses.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Energy Improvement Study of a Double-Skin Façade in Winter
           Conditions
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Theodor Bratosin, Eugen Iavorschi, Cristian Chereches, Catalin Popa
      A numerical study of a natural convection flow coupled with radiation was carried out in a double-skin façade. The solar radiation flux to which the double-skin façade is subjected has been chosen for a cold season month (φ = 66.9 W/m2 ). The double-skin façade is installed on a building whose interior temperature is 293 K given that the temperature at the inlet in winter conditions is 255 K. This study focuses on 5 different widths of the double-skin façade (4, 6, 8, 10 and 12 cm). Three-dimensional numerical simulations have been carried out for a steady and turbulent flow. Transport equations of mass, momentum and energy are solved numerically using finite volume method. Velocity and temperature profiles show the differences between all the above mentioned 5 cases in order to highlight the optimal width of the double-skin façade.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • In Situ Performance Assessment of a Bio-Sourced Insulation Material from
           an Inverse Analysis of Measurements on a Demonstrator Building
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Marouen Slaimia, Naima Belayachi, Dashnor Hoxha
      The purpose of this study is to evaluate the potential of bio-sourced material based on cereal straw for an efficient insulation. Decreasing significantly energy consumption of buildings requires not only the very best insulation material for heat loss reduction through the wall but also the reduction of air permeability which can affect automatically the comfort in the building. This is why, propose an insulation material with low thermal conductivity remains insufficient and the evaluation of the performance of the new insulation material in situ in real conditions is an essential step. The experimental building ( PROMETHE demonstrator) is set up with wood frame and multilayered walls composed with cinder blocks and insulation bio-composite based on cereal straw in order to simulate the thermal rehabilitation conditions according the External thermal insulation principle. Each façade is divided in four part with three different insulation bio-composites and naked part for comparison reasons. Hygrothermal sensors are used both inside and outside of the demonstrator, and heat-flux sensor is placed at the cinder blocks biocomposite interface. These in situ measurements are used to compare the efficiency of three bi-sourced materials and for the modeling the hygrothermal behavior of the multilayer wall by using the set of identified parameters in laboratory.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Experimental Analysis of Temperature Reduction Capacity for Wood
           Ventilated Façades
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Claudiu Romila, Ruxandra Cozmanciuc
      Ventilated façades are increasingly used for retrofitting of exterior walls but also as a passive strategy in the reduction of heat transfer through the envelope of new buildings. If correctly designed and constructed, ventilated façades can lead to energy savings and increased durability of exterior walls. Nevertheless, the main advantage of these constructive systems is the capacity to reduce heat load on the building during the warm season due to the air that flows inside the cavity. The total heat transported by convection is influenced by the temperature distribution inside the channel and depends on many factors, the most important being the channel thickness and the type of the exterior layer. This work presents an experimental study of the temperature reduction capacity for different channel thicknesses and exterior layer tightness on a real scale wooden ventilated façade wall.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Monitoring a Group of Hydraulic Pumps Connected to the Water Feeding
           System of a Civil Building
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Nicuşor Baroiu, Virgil Gabriel Teodor, Florin Iftode
      The paper describes the method that can be used to monitoring of a water feeding system of a civil building and its subsystems, using a graphic interface of a soft-ware pack – SCADA (Supervisory Control and data Acquisition), WinCC Flexible. The effective adjustment of the pressure of the water feeding system implies using specific elements: sensors, execution elements, programmable automatons and monitoring devices. In the paper, also is analysed the situation in which three centrifugal pumps are utilized as execution elements, a pressure sensor – to measure the pressure of the water feeding system of the consumer, three sensors that detect the presence of water in each well and a Siemens programmable automaton, from the SIMATIC S7-300 series, which controls the process and a PC for the acquisition of data and for monitoring. Thus, it presents a schematic system operating water supply, logic operation sequence control, protection, signage and display alarms


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • The Eco-Design Directive ErP for AHUs
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Cătălin George Popovici
      The European ErP-Directive 2009/125/EG (Energy-related-Products-Directive), also called the Eco-Design Directive, defines the minimal requirements for energy-related products. The objective of the ErP-Directive is the reduction of energy consumption and the CO2-emission rates as well as an increase of the overall share of renewable energies. This directive applies for all products placed on the market within the European Economic Area (EEA). Relevant for the AHUs is the EC-Directive 1253/2014/EG that came into force on November 26th 2014. Within the framework of this directive and as of January 1st 2016, new requirements concerning the energy efficiency of AHUs will apply within the European Economic Area (EEA). The paper analyzes the new requirements for Air Handling Units under ErP Directive and its consequences.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Thermal Modeling of Thermo-Active Systems in Subway Tunnels: A Chilean
           Case Study
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Williams Calderón, Mauricio J. Toledo, Raimundo Cirano
      Since the mid 80’s thermo-active structures have been used around the world to take advantage of shallow geothermal energy. However, these systems have just been considered as energy options in Chilean projects.
      In this article we explore the design, numerical modeling, and thermal behavior of a flat heat exchanger integrated to the concrete wall of a subway tunnel in Chile. The thermo-active structure is the concrete tunnel wall (energy tunnel) that has an arrangement of circular pipes with water as the heat carrier fluid. Such a system has a low-cost installation, because pipes are embedded in the concrete tunnel wall during construction.
      The numerical modeling considers actual environmental conditions in the tunnel and the surrounding ground properties. The considered operating condition is restricted to heat transfer from the air within the tunnel and from the surrounding ground to the heat carrier. We studied the dependency of heat absorption on the heat carrier flow rate, and on the spacing of pipe arrangements. Results predict that a 10-meter section of tunnel can capture up to 6.900W in winter and 10.300W in summer. Most heat (75%) is extracted from the air within the tunnel, which allows a reduction of the tunnel air temperature of 5°C during winter and of 8°C during summer. Thus, implementing such a system has a dual effect of cooling the tunnel (a desired outcome) and providing a source of cheap thermal energy.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • The Surface Temperature Factor - An Assessment Criterion of Superficial
           Condensation Risk
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Irina Baran, Mihaela Stela Georgescu, Laura Dumitrescu, Irina Bliuc, Radu Aurel Pescaru
      The emergence of condense phenomenon, generally associated with the mould, on the inner surface of the closing elements affects not only the finishing works quality, but also the comfort conditions and, not least, the occupants’ health. The phenomenon is caused by the simultaneous action of several categories of factors. If factors related to the design and structure of closing elements can be controlled by proper design and execution respecting the quality requirements, those related to users’ behaviour and to indoor and outdoor climate conditions, have a variable and random character. Hence there is the possibility that all or most of parameters, that reflect the action of these factors simultaneously, reach values ​​that can cause mould and condensation on the surface. In these circumstances we can speak of a risk level defined as the possibility of producing an undesirable event. The risk assessment involves the precise definition of it and finding a way to calculate how often such an event may occur under particular conditions. One of the criteria to be taken into account to estimate the risk of superficial condensation is the temperature factor. The effective value of this criterion is influenced by several categories of factors that refer to the indoor climate conditions influenced by users’ behaviour, constructive and architectural features and outdoor climate. The objective of this paper is to integrate a phenomenological approach of producing the surface condensation and mould in a complex analysis, through this global criterion, using the concept of "risk”.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • The Thermal and Optical Behavior of Multilayer Low-E Solar Control Glass
           Surfaces
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mircea Horne Horneț, Raluca Dania Todor, Nicolae Fani Iordan, Cristian Năstac, Mircea Drăghici, Paraschiva Mizgan
      Glass is one of the most popular and versatile building materials used today. One reason is because of its constantly improving solar and thermal performance. And one way this performance is achieved is through the use of passive and solar control low-e coatings. In architecture, the proper use of natural light can help reduce the energy consumption of a building (by reducing the heat load for heating - based on the superior of solar contributions, with an appropriate glass type and daylighting). This paper aims to present the thermal behavior of multilayer glass surfaces, low-e solar control and highlight differences to ordinary glass.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Thermo-Aeraulic Simulation of Mono Façade Natural Ventilation
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Mircea Horne Horneț, Raluca Dania Todor, Nicolae Fani Iordan, Mircea Drăghici, Cristian Năstac, Paraschiva Mizgan
      Natural ventilation is an energy efficient alternative for reducing the energy use in buildings, achieving thermal comfort and maintaining a healthy indoor environment. Differences in wind pressure along the façade and differences between indoor and outdoor temperatures create a natural air exchange between indoor and outdoor air. These physical processes are complex, and predicting ventilation rates is difficult. This paper presents a method for determining natural ventilation air flow in single-façade thermo-air system by simulating the room using the program TRNSYS 16. Theoretical checking of the airflow obtained by simulation was performed by comparing the thermal response in the room following the simulation, with interior temperatures measured during the experiment.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Evolution of the Efficiency of a Photovoltaic/Supercapcitor System with
           Aging
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Pierre Olivier Logerais, Amadou Korka Diallo, Vincent Guihéneuf, Olivier Riou, Fabien Delaleux, Jean Félix Durastanti
      The evolution of the optimization of photovoltaic/supercapacitor system according to its age is inquired. The system is modeled by an accurate equivalent circuit. The durations and energies of charge/discharge cycles are calculated for a 10 year use. The temporal and energy efficiencies are then deduced according to time, and optimal values are hence extracted. Results show that the optimal efficiencies can be kept constant over time at a value around 90% for the energy. However, the amount of energy stored and released by the supercapacitors is reduced over the years and the response time becomes shorter. So, the behavior of the system is modified with aging regarding its initial nominal functioning. This has to be considered to know the real profitability of the system.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • A Software Tool Developed for Simplified Numerical Modeling of Thermal
           Conduction around Distorted Geothermal Boreholes
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Augustin Leiter
      The geometric characteristics of multiple geothermal boreholes organized in a geothermal system affect its thermal efficiency. The location of boreholes and their verticality and straightness is often distorted during drilling process. This distortion then degrades thermal properties of such a system. To study this phenomenon a specialized software tool was developed for numerical modeling based on a simplified mathematical model. This paper describes software tool briefly and presents some initial numerical models of basic borehole arrangements solved by this tool. Paper also contains a verification calculated by specialized software FEFLOW.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • A Probabilistic Model to Estimate Cost of Drinking Water Projects in Rural
           Areas
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Victor Cuevas, Loreto Gatica, Jaime H. Garcia Palacios
      In Chile there are numerous drinking water projects in rural areas, from which it is possible to extract relevant information that could be incorporated into a learning model based on cases to estimate a particular variable. Among the learning models based on cases are Bayesian networks, which have the particularity to predict a variable and quantify its uncertainty. In this paper, a methodology to build a model based on Bayesian networks to estimate the likely investment cost of a new drinking water project in rural areas is proposed. It has a database of 32 projects built between 2009 and 2014, in the region of Los Rios, Chile. Two Bayesian networks structures were created, each with eight common variables to both. The proposed networks were trained with data extracted from 26 randomly selected projects. The remaining 6 projects were used as a control group to evaluate Bayesian networks and compare their results. When each network was evaluated with the control group, it was observed that in general the predicted results were consistent with those observed in 83% of cases. Finally, it was concluded that the constructed model can estimate the likely investment cost of a new drinking water project in rural areas, quantifying prediction uncertainty, expressing the results in probabilistic terms. This model could become a useful management tool, both companies and government agencies whose mission is to assess, allocate resources, and define projects approval and implementation.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • An Assessment of the Noise Level in a Residential Area Crossed by an
           Intensive Traffic Road - Comparative Analysis between on Site Measurements
           and Legal Standards
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Irina Stefan, Mihai Budescu
      Nowadays the noise level increased due to the expanding of the urbanization and the extended number of vehicles. The aim of the study is to assess the level noise in the area of an urban intensive traffic road. The selected road has residential buildings on both sides and it makes the link between two major areas in the town. Last year, along with the rehabilitation of the bridge on this road and of the street’s pavement, a protection barrier has been mounted on the sidewalk.Measurements of the noise levels were taken during a workday, within rush-hours and low-traffic hours, using a sound level measuring instrument. The measurements were taken along the road, in three characteristic spots of the ramp input on the bridge: 1 – close to the traffic light (with the vehicles at rest), 2 - mid ramp (area of maximum acceleration) and 3 - at the end of the ramp, thus determining the noise level in the area. Measurements were also made perpendicular to the road: at the border of the sidewalk, behind the protective barrier and near the facade of the building, to determine the effectiveness of the protection barrier.Maximum, minimum and the mean value of the urban noise level in the area have been determined and compared to the legal standards for urban residential roads.By analyzing measured data it can be concluded that the mean values exceed the maximum permitted levels.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Developing an Innovative Urban Traffic Noise Monitoring System
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ilinca Mirela Beca, Mihai Iliescu
      The transportation policies focusing on minimizing the environmental impact aim at an improved quality of life and health of the population, the urban one in particular. Noise pollution is one of the biggest problems associated with the European urban environment at the present moment, mainly because of the ever-increasing road traffic.
      SUNET system (System for Urban Noise and Eco-Traffic) was designed to improve the management of the noise pollution in Cluj-Napoca and to provide up-to-date public data on a user-friendly interface. The implementation of the application over the entire municipality is highly advantageous as it creates a link between the town’s administration (the local authorities, the City Hall of Cluj-Napoca) and the user (the citizens) through this system which is dynamic, modern and compliant with the European regulations. The graphic interface uses the HTML (HyperText Markup Language) code, while the database is set up in an SQL (Structured Query Language) format and contains information about the characteristics of the system and users alike, all organized in specific tables.
      The need for an online urban noise pollution monitoring system, such as the SUNET one, appears to allow the provision of fairly realistic and up-to-date information and encourage the community to actively assist in the application of proper action plans and the decision-making process when it comes to the population’s exposure to high levels of noise pollution.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Integration of Geohazards in Urban Planning and Management
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Eleftheria Poyiadji, Villy Kontogianni, Nikolaos Nikolaou
      Geological conditions capable of causing damage, or loss of property and life, are called geological hazards and commonly referred to as "geohazards". Geohazards are recognised as a major threat for the society leading the scientific community into introducing various methodologies for susceptibility, hazard and risk assessments.The integration of these assessments into Urban Planning and Management can significantly enlarge society resilience to geohazards. For an effective integration of geohazards into Urban Planning and Management specific actions are needed: common guidelines, legislation for planning policies.Specific methodologies for hazard assessment specially designed for Urban planning with selected case studies are presented together with a description of relevant Greek legislation.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • GPS-Based Study on an Interurban Road Connection
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Rodica Dorina Cadar, Rozalia Melania Boitor
      The paper presents an extensive theoretical background related to the travel time and the studies that were conducted during the recent years on the subject. As a concept, travel time is related to the period of time spent in travelling between two different points in space. The analysis focuses on several aspects related to the travel time concept such as its usefulness, its influencing factors, and data collection methods for its determination. In order to also provide a practical outcome, the main interurban road connection between Cluj-Napoca and Tîrgu-Mureş was studied. The road trespasses both urban and rural localities in the North-Western of Romania. For the data collection process, a GPS-based equipment was placed on a test vehicle to run the route for multiple times, at different days and hours. The collected data were studied by means of statistical analysis in order to establish the most relevant aspects of the travel time. The research goal of the paper was to evaluate the influence exerted by demographics and type of locality on travel time by means of eventual delays. The main findings were employed to analyze the traffic conditions as well as the parameters that have a major impact on them. According to the results of the analysis, the traffic flow on the interurban route is best described by the travel time and consequently the delays registered due to multiple obstructive elements such as railway level crossings, pedestrian crossings within the localities, and level intersections between different roads category. However, according to the study, it can also be concluded that travel time and therefore the eventual delays are not influenced to a great extent by neither the type of transited localities - urban or rural, nor the demographics.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Space-Time Prism Vertices for Morning and Evening Commuters in
           Cluj-Napoca, Romania
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Cristian Tosa, Tomio Miwa, Takayuki Morikawa
      This paper investigates socio-demographic characteristics in the origin and terminal vertices of the time-space prism, by using the stochastic frontier method for morning and evening full time workers in the metropolitan area of Cluj-Napoca, Romania. Observed trip starting and ending times are used as dependent variables, while trip distance and time, as well as spatial characteristics to distinguish among commuters are independent variables. The results discuss spatial and temporal patterns of the commuting trips in estimating the temporal vertices of time-space prisms in a former socialist, developing country context.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Implementing the Life Cycle Cost Analysis in a Building Design
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Raluca Dania Todor, Mircea Horne Horneț, Nicolae Fani Iordan
      In the context of increasing concerns for sustainable development new comprehensive methods are developed by builders and architects in order to reduce the environmental impact of buildings. Life Cycle Cost Analysis (LCCA) is one of these methods, perhaps the most functional one for the evaluation process. Using this LCCA contributes to the integration of the design process and helps identify opportunities for energy efficiency, such as appropriate zoning, natural lighting and design optimization of heating, ventilation and air conditioning (HVAC). It also helps in finding the best solutions for reducing overall costs. LCCA is very little known in Romania and quasi unused practice for building design and for this reason the present paper contains a broad overview of the methodology and it’s uses highlighting its main advantages and a case study of the building design intended for laboratory research. The analyzed building is one of the 12 identical buildings of Transilvania University Research and Development Institute from Brasov.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Actual Trends in Construction Project Management in Romania
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ion Șerbanoiu, Marina Verdeș, Adrian Alexandru Şerbănoiu, Bogdan Vasile Șerbanoiu, Mihaela Munteanu
      The current trends in the construction industry, considering the magnitude and complexity of construction projects required the development of an appropriate methodology in the design, commissioning work and completion of works. The objective imposed creation of the "Office of Project Management" and all processes, tools and techniques of project management respects besides applicable standards and legislation construction, also imposed code of ethics and professional conduct of the PMI that guides practitioners professional project management, construction engineers, installers, architects etc. and describes the expectations that they have of themselves and of others.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Analysis and Value Engineering Applied in Building Restoration - Proposed
           Methodology
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Ioan Ciocan, Catalin Onutu
      The principal route of success in construction is, according to most experts, economic competitiveness, and the main conditions are: the correct management of cost and quality of construction works and services in the competitive market. Analysis Method and Value Engineering allow the development of competitiveness (efficiency) construction firms in a meaningful, durable and this in an economic environment more complex and evolving. The proposed methodology seeks to solve these problems and give a reply in this regard and create the possibility of reducing the price of construction.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Modern Technologies to Achieve Social Housing from Environmentally
           Friendly Materials
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Adrian Alexandru Şerbănoiu, Alexandru Timu
      In an era when the economic crisis is coupled with the immigrants crisis thus exponentially increasing the number of those who need social assistance the need of living spaces is increasingly more. Building of such areas requires a high consumption of resources without fully addressing the requirements of comfort and efficiency.

      The Life cycle assessment of the product LCA is an environmental management technique that identifies flows of materials, energy and waste of a product during a product life-cycle management and environmental impact.

      Life cycle assessment (LCA) models the complex interaction between a product and the environment from cradle to grave. It is also known as life cycle analysis or ecobalance. Even though the LCA methodology is applied in building social housing there are few studies which analyze its impact on the construction phase of design, production, use and post- use as well as how the use of precast technology would meet LCA.

      The study aims is to identify those technologies and building materials that meet both the increasing requirement of achievement of cheap social housing but also meet the quality and environment standards. In this context the LCA (Life-cycle assessment), help us to develop a new methodology which consider the concept of housing as a product made from organic materials, cheap, easy to put into practice, which retain their value over the life of the building with minimal intervention during operation, and when the demolition occurs, the used materials can be exploited with low power consumption and without harming the environment.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Technical and Contractual Trends for Micro Tunneling Projects in Romania
           and Bulgaria
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): George Tsitsas, Chavdar Kolev, Liliana Radoi, Vlad Petrila
      This publication provides an overview of the current technical and contractual trends that govern the execution of micro-tunneling projects in both Romania and Bulgaria. Technical issues discussed include available equipment and technologies, aspects related to the complexity and challenges of these works, comparisons between the open trench and trenchless methods, environmental impact, and other. Legal issues discussed include contractual schemes, relationship between the parties involved, dispute resolution, and contract types in compliance with both the national as well as the European Union law. Appropriate technical equipment is recommended to avoid risk in implementation and ensure the quality of finished products.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Real Estate Administration - Notion, Forms and Legal Regime
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Violeta Herea, Eduard Antohie
      The extent of this field, namely of real estate administration, due to the fact that private property holds the majority compared to public property after 1989, imposed the emergence of profile firms / companies in the field, but also the need to train specialists for this type of activity. Why the real estate administration? Perhaps this question should be the starting point for the reason why we advocate for this type of activity and thus for the training at university level, thus giving it the importance it deserves. The answer to this question is argued by: the capital invested is very small, solvent customers, regular revenues, chances of gains from good to very good, a multilateral activity due to the complexity of administration. On the other hand, this type of activity may be carried out in parallel with the main activity, namely the basic one of each of us. Therefore, many prospective real estate administrators begin to provide services in this area without sacrificing the core business, while performing these along with another activity for another institution. In analysing this issue we invoke the regulations in force which legislate the field which represents the purpose of our analysis. Also, we will present you the advantages of this kind of activity.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Self Compacting Concrete Structures: A Techno-Economic Analysis
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Nicolae Cazacu, Aurelia Bradu, Nicolae Florea
      The concept of self-compacting concrete (SCC) was performed in late 1980 by Japanese researchers as a solution for the lack of skilled workers and decreasing quality in building industry. The high fluidity of SCC allows flowing under its own weight, filling completely the formwork without any vibration or material segregation, providing a higher quality of the concrete surface. Since its discovery, a large number of researcher studied its rheological properties, adjusted mix design methods and analysed mechanical characteristics. The placement method for conventionally concrete is no more valid for SCC, as mixture behaviour changed substantially. This aspect was less examined and the published material is inconsistent, even though it plays an essential role in the assessment of the global cost of a building. The aim of this study is to investigate materials cost, the labour requirements, formwork demands, methods of placement and construction time for building a structure using SCC and vibrated concrete and compare the results.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Techniques and Instruments Used in Construction Projects Management -
           Establishement and Modeling Specific Action Methodology
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Catalin Onutu, Ioan Ciocan
      Construction projects have a number of features which clearly differentiate industrial production problems that may occur as are many, very diverse and no t lea st very difficult to solve. This difficulty in solving the weight comes from modeling phenomena regarding specific construction activity. So it requires a good knowledge of the content and implementation stages of a construction project and to ensure compliance with the rules and specific requirements.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
  • Technical Assessment of Constructions in Real Estate Appraisal
    • Abstract: Publication date: 1 March 2017
      Source: Advanced Engineering Forum Vol. 21
      Author(s): Svetlana Albu
      One of the modern society priorities is the tendency towards sustainable social and economic development. Sustainable development is possible through the preservation and efficient use of the values created by our ancestors and the ability to meet current needs so as not to endanger the ability of future generations to meet their own needs. Real estate appraisal activity evaluates the changes in property value over time. Physical or legal actions on the property are justified only if the future value is not affected.Theory and practice of appraisal activity quantifies three approaches to value:The Sales Comparison Approach – value is examined in terms of current market preferences;The Income Approach – determine the income the property is expected to generate over time as a result of the most probable use;The Cost Approach – value is perceived in terms of replacement cost of real estate with one with comparable utility.Technical assessment of constructions is applied as a rule mainly in the cost approach, and has a major impact on the estimate of market value. The role of technical assessment is reduced, even ignored and not taken into account in other approaches.The present research examined the role of technical assessment of constructions in the process of real estate appraisal and the impact of inspection on the real estate value.


      PubDate: Wed, 1 Mar 2017 00:00:00 +0100
       
 
 
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