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Journal Cover American Journal of Civil Engineering and Architecture
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2328-398X - ISSN (Online) 2328-3998
   Published by Science and Education Publishing Homepage  [72 journals]
  • Performance of Concrete Filled Steel Tubular Columns

    • Authors: T. Kibriya
      Pages: 35 - 39
      Abstract: Recent advancements in the availability of higher strength steels, better coating materials for protection and high strengths/performance concretes have expanded the scope of concrete filled steel composite columns with wide ranging applications in various structural systems with ease of construction, highly increased strengths and better performance. This experimental study is carried out on the behavior of short, concrete filled steel tubular columns axially loaded in compression to failure. Three dimensional confinement effect of concrete along with support provided by concrete to the thin walls of steel tube to prevent local buckling had a composite effect on the strength of the composite column increasing the compressive strengths by almost 300 to 400%. In addition to the concrete core, the parameters for the testing were shape of the steel tube and its diameter-to-thickness ratio. It has been observed that ultimate strength of concrete filled steel tubes under concentric compression behavior is considerably affected by the thickness of the steel tube, as well as by the shape of its cross section. Confining effect in circular CFST columns improves their strength, appreciably. The axial load-deformation behavior of columns is remarkably affected by the cross-sectional shape, diameter/width-to-thickness ratio of the steel tube, and the strength of the filled concrete. The load deformation relationship for circular columns showed strain-hardening or elastic perfectly plastic behavior after yielding.
      PubDate: 2017-2-18
      Issue No: Vol. 5, No. 2 (2017)
       
  • Response of Domestic Damascene Architectural Elements to the Climatic
           Factors between the Traditional and Modern Times

    • Authors: Hiba. A. Alhawasli; Zeinab B. Farhat
      Pages: 40 - 46
      Abstract: The climatic factors (temperature, humidity, earth geology, wind speed and direction, solar radiance) are considered one of the most important effects on any site prepared for construction. Thus, these factors are studied before suggesting any schematic regulations and plans for its influence on the building form, allocation, materials options, and suitable green cover, and the functional distribution between parts. This study is trying to analyze the effects of climatic and regional factors on the design elements of the domestic architecture of Damascus. We are going to select different cases of traditional houses that evolved and transformed through several transitions of history. Then we will analyze these transformations and the extent of the response and maintenance of respecting climatic conditions. Research method is descriptive and interpretative. For literature review the descriptive method is used and analyzing of cases is done by interpretative method. Samples are selected from saurian traditional and modern hoses. Building materials, shape of spaces and opening are studied variables in this study. Comparative method is used for comparison of mentioned variables in related to climate factors. The result of study shows that the traditional house in Damascus is considered a reflection of serious attempts in the environmental design which is compatible with regional climate. New buildings completely ignored climate closed central space, called (the sofa) replaced the interior courtyard within the traditional dwelling, with a deficit of this space to insuring sufficient light and air inside the building. Also it relied on those structural materials of medium or high energy content, such as cement, glass and aluminum, which are widely used today in constructing modern residential buildings, despite the lack of suitability of climate in the region. This was accompanied by the excessive use of heaters and air-conditioners to achieve the thermal comfort inside the building, without considering the amount of energy consumed.
      PubDate: 2017-3-4
      Issue No: Vol. 5, No. 2 (2017)
       
  • Sustainable Construction – Use of Blended Cements in
           High-Performance Concrete Pavements

    • Authors: T. Kibriya; L. Tahir
      Pages: 47 - 50
      Abstract: This study aimed at evaluating the properties of high performance concrete pavements made from blended cements using agricultural wastes i.e. rice husk ash, Portland cement, natural aggregates and sand. Large quantities of agricultural wastes like rice husk are generated from rice processing units worldwide. Rice husk ash blended with Portland cement has proved to improve cement strength as well as durability however its use in high performance concrete pavements has not been investigated to-date. Keeping in view the typical problems of pavements mainly due to dynamic loading, larger exposed surfaces, use of deicing chemicals, effects of groundwater containing sulphates etc, wide ranging investigations covering most aspects of mechanical behavior, permeability and durability aspects including sulphate and chloride resistance and shrinkage were carried out for various mixes for compressive strengths of 60N/mm2 and 80N/mm2. Compressive strengths of concrete specimen with blended cements were observed to be higher by about 5 to 10% than the control specimen, higher values for concrete with 75% Portland cement blended with 25% rice husk ash whilst lower values correspond to concrete with 50% Portland cement blended with 50% rice husk ash. Similarly, higher flexural strength, improved moduli of elasticity, higher density, lower permeability, improved sulphate and chloride resistance and reduced shrinkage were observed. Better strengths and improved durability of such pavement concretes is likely to make it a more acceptable material for major road construction projects.
      PubDate: 2017-3-7
      Issue No: Vol. 5, No. 2 (2017)
       
  • Effects of the Environmental Factors on Decision Consistency

    • Authors: Anett Rácz; Tibor István Rácz
      Pages: 51 - 56
      Abstract: Responsible decisions are taken both in our everyday lives and in business processes of big enterprises. Decisions have an effect on our future, the efficiency of our work, our successes. There are decisions which need an especially substantial and persuasive decision process because taking them is complex problem or their consequences are important to us. In these cases the decision process is particularly important to be well-established and clear from the point of initialization to the point of defining the final solution. The most sensitive part of a decision process is the human factor, the inconsistency of the Decision Maker(s) (DMs). Hence we should pay due attention not only to developing the most appropriate algorithm but also to improving the intuitive efficiency of the DMs. The impact of internal factors on inconsistency like the type of the problem (subjective or objective), the size of the pairwise comparison matrix or the order of filling have been studied in several papers (i.e. [2,9]). However, the authors of these papers usually ignore the human factor of the decision process. We investigated what by what means and how we can enable the DMs to make the most consistent decision inspired by design.
      PubDate: 2017-3-27
      Issue No: Vol. 5, No. 2 (2017)
       
  • ICAO Overloading Practice versus Airport Pavement Design Life Using
           FAARFIELD 1.3 and COMFAA 2.0, 3.0

    • Authors: Ahmed Mohamady Abdallah Wahba
      Pages: 57 - 65
      Abstract: The objective of the study is to evaluate the impact of New Large Aircraft (NLA) on airport flexible pavement versus overloading in ICAO Practice. The study is conducted using Hurghada, Egypt Airport air fleet composition at four annual departure levels, four standard subgrade strength categories, and adding NLA at five different percentages. On the basis of the results of this research, it is concluded that, The statement in ICAO Practice “the annual number of overload movement should not exceed approximately 5 per cent of total annual aircraft movement” must be re-evaluated due to many factors as new large aircraft type ,annual departures and soil characteristics which High reduction in pavement life that has an average of 8.2% of 20 years design life due to introduction of A380-800 by 5% of annual departures, occurred at 3% CBR ., and The statement in ICAO Practice “For flexible pavement occasional movement by aircraft with Aircraft Classification number (ACN) not exceeding 10 per cent above the reported Pavement Classification number (PCN) should not adversely affect the pavement” must be re-evaluated because there is no restriction for adding new large aircraft with 5% Annual departure at any annual departures, soil characteristics comparing between COMFAA 2,3 software which High reduction in pavement life that has an average of 8.2% of 20 years design life due to introduction of A380-800 by 5% of annual departures, occurred at 3% CBR.
      PubDate: 2017-4-1
      Issue No: Vol. 5, No. 2 (2017)
       
 
 
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