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  Subjects -> ENGINEERING (Total: 2282 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (186 journals)
    - ELECTRICAL ENGINEERING (102 journals)
    - ENGINEERING (1204 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (68 journals)
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CIVIL ENGINEERING (186 journals)                     

Showing 1 - 186 of 186 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 17)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 34)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 27)
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 30)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 1)
ATBU Journal of Environmental Technology     Open Access   (Followers: 3)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 9)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Berkeley Planning Journal     Open Access   (Followers: 7)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 15)
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 11)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 10)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 17)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 2)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 5)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 7)
Civil And Environmental Engineering Reports     Open Access   (Followers: 5)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 17)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 9)
Civil Engineering Dimension     Open Access   (Followers: 8)
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 258)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 10)
Computers & Structures     Hybrid Journal   (Followers: 36)
Concrete Research Letters     Open Access   (Followers: 6)
Construction Economics and Building     Open Access   (Followers: 2)
Construction Engineering     Open Access   (Followers: 8)
Construction Management and Economics     Hybrid Journal   (Followers: 21)
Construction Science     Open Access   (Followers: 4)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 2)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 16)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 14)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 8)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 16)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 4)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 6)
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 22)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 13)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 8)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Pavement Research and Technology     Open Access   (Followers: 4)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 10)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 6)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 11)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 7)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Society     Hybrid Journal   (Followers: 3)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 24)
Journal of Construction Engineering     Open Access   (Followers: 7)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 19)
Journal of Construction Engineering, Technology & Management     Full-text available via subscription   (Followers: 4)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 8)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Fluids and Structures     Hybrid Journal   (Followers: 6)
Journal of Frontiers in Construction Engineering     Open Access   (Followers: 2)
Journal of Green Building     Full-text available via subscription   (Followers: 11)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 12)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 21)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Marine Science and Engineering     Open Access   (Followers: 1)
Journal of Materials and Engineering Structures     Open Access   (Followers: 4)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Offshore Structure and Technology     Full-text available via subscription  
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 4)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 7)
Journal of Rehabilitation in Civil Engineering     Open Access   (Followers: 3)
Journal of Solid Waste Technology and Management     Full-text available via subscription   (Followers: 1)
Journal of Structural Engineering     Full-text available via subscription   (Followers: 39)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Architecture and Civil Engineering     Open Access   (Followers: 3)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 4)
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil dan Perencanaan     Open Access  
Konstruksia     Open Access  
KSCE Journal of Civil Engineering     Hybrid Journal   (Followers: 2)
Latin American Journal of Solids and Structures     Open Access   (Followers: 4)
Materiales de Construcción     Open Access  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 6)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 2)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 7)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 11)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Recent Trends In Civil Engineering & Technology     Full-text available via subscription   (Followers: 4)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 9)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 4)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 9)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 11)
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 12)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 8)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 6)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)

           

Journal Cover Hormigón y Acero
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   ISSN (Print) 0439-5689
   Published by Elsevier Homepage  [3044 journals]
  • Carta del Director
    • Authors: Gonzalo Ruiz López
      Pages: 1 - 2
      Abstract: Publication date: January–April 2017
      Source:Hormigón y Acero, Volume 68, Issue 281
      Author(s): Gonzalo Ruiz López


      PubDate: 2017-05-11T15:31:48Z
      DOI: 10.1016/j.hya.2017.03.001
       
  • Modelización de vigas mixtas con interacción imperfecta
    • Authors: Ricard Caus; Jose Antonio Lozano-Galant; Enrique Mirambell Arrizabalaga; Dong Xu; Jose Turmo
      Abstract: Publication date: Available online 12 September 2017
      Source:Hormigón y Acero
      Author(s): Ricard Caus, Jose Antonio Lozano-Galant, Enrique Mirambell Arrizabalaga, Dong Xu, Jose Turmo
      En la mayoría de vigas mixtas, la conexión entre el hormigón y el acero es imperfecta y, por tanto, aparece un mayor o menor deslizamiento relativo entre ambos materiales. Este deslizamiento afecta tanto a las deformaciones como a los esfuerzos de la viga. Para simular este fenómeno, en este trabajo se propone un nuevo modelo de elementos finitos bidimensional basado en elementos tipo viga, facilitando así la interpretación y la aplicación práctica de los resultados. Para validar la precisión del modelo, se comparan los resultados obtenidos mediante el modelo con los derivados de las ecuaciones analíticas propuestas en la literatura, en dos estructuras mixtas con diferentes estados de carga. In most composite beams, the concrete and steel connection is flexible to some extent. For this reason, a relative slip always appears at the interface. This slip is of primary importance because it affects both the deflections and the stresses in the beam. To simulate this phenomenon, a two-dimensional finite element based on frame elements model is proposed. The main advantage of this model is its easy interpretation of the results and its applicability on design practice. To validate the accuracy of the proposed model, this has been verified against those results obtained by analytical equations available in the literature for different loading cases.

      PubDate: 2017-09-19T09:40:59Z
      DOI: 10.1016/j.hya.2017.07.003
       
  • Mejora de la sostenibilidad y el comportamiento en servicio de estructuras
           de hormigón mediante el uso de fibras metálicas recicladas
    • Authors: Giancarlo Groli; Alejandro Pérez Caldentey
      Abstract: Publication date: Available online 30 August 2017
      Source:Hormigón y Acero
      Author(s): Giancarlo Groli, Alejandro Pérez Caldentey
      En este trabajo se presenta un estudio teórico y experimental relativo a la mejora del comportamiento en servicio del hormigón estructural mediante la adición de fibras metálicas recicladas obtenidas a partir de neumáticos usados. Este trabajo recopila tres series de ensayos: una sobre elementos de tamaño reducido, otra sobre vigas de gran tamaño sometidas a dos cargas puntuales, con una amplia zona de momento constante, y una última campaña relativa a soportes sometidos a desplazamientos impuestos en cabeza. En el caso de las vigas isostáticas de gran tamaño, se dispone de una serie de ensayos gemelos realizados con un hormigón convencional. Se examinan los resultados experimentales incidiendo en la influencia de la adición de fibras en el comportamiento en servicio. Los resultados experimentales se comparan con resultados teóricos obtenidos, incorporando a la ecuación constitutiva del hormigón la rama de ablandamiento en tracción a la que contribuyen las fibras, además del efecto de contribución entre fisuras propio del hormigón estructural convencional. Estos resultados se comparan también con los obtenidos mediante aplicación del modelo propuesto por el MC2010. Finalmente, se introducen estudios que se están llevando a cabo en el marco del proyecto de investigación Anagennisi (renacimiento), que busca reciclar en aplicaciones relativas al hormigón estructural todos los componentes de los neumáticos. Estos estudios se centran en cómo se puede mejorar la sostenibilidad de las estructuras de hormigón mediante el uso de fibras metálicas recicladas, buscando aplicaciones concretas en las que su influencia puede resultar determinante, tanto a efectos de reducir los costes de construcción como de reducir el impacto medioambiental (huella de CO2 y consumo de energía). Estos estudios se centran en el proyecto de estructuras de contención de aguas y en aumentar la esbeltez de losas en estructuras de edificación. In this work, a theoretical and experimental study is presented as regards the improvement in the performance in service of concrete structures by adding recycled metal fibres obtained from used tyres. This work compiles three series of tests: one on reduced size elements, another on large beams subjected to two particular loads, with a wide constant moment area, and lastly a series on supports subjected to imposed head movements. In the case of large-sized isostatic beams, a series of twin trials carried out with conventional concrete is presented. An analysis is made of the experimental results that have a bearing on the influence of adding fibres on the in-service performance. The experimental results are compared with the theoretical results obtained, incorporating into the constitutive equation of the concrete the tension softening branch to which the fibres contribute, as well as the effect of the contribution between cracks of the conventional structural concrete itself. These results are also compared with those obtained by applying the model proposed by MC2010. Finally, studies are presented that are being conducted within the framework of the Anagennisi (Re-Birth) Research, which looks to recycle all the components of tyres in applications relative to structural concrete. These studies are focused on how the sustainability of concrete structures can be improved with the use of recycled metal fibres, as well as looking for particular applications in which their influence could be a determining factor, both as regards reducing construction costs, as well as reducing the environmental impact (CO2 footprint and energy consumption). These studies are focused on the project of water containment structures and in increasing the slenderness of the flagstones in building structures.

      PubDate: 2017-09-01T03:35:50Z
      DOI: 10.1016/j.hya.2017.07.002
       
  • Patología en estructuras resueltas con elementos prefabricados de
           hormigón
    • Authors: Miguel Ángel Liébana Ramos; Ramón Álvarez Cabal
      Abstract: Publication date: Available online 24 August 2017
      Source:Hormigón y Acero
      Author(s): Miguel Ángel Liébana Ramos, Ramón Álvarez Cabal
      En este trabajo se exponen, a través de ejemplos y casos reales, algunos de los problemas más frecuentes en estructuras resueltas con elementos prefabricados de hormigón. Estos problemas suelen estar asociados a una infravaloración de las tolerancias de fabricación y montaje durante la fase de proyecto, así como a la ausencia de arriostramientos o mecanismos de anclaje que garanticen su estabilidad frente a acciones horizontales. Adicionalmente, se reflexiona sobre las exigencias de la normativa vigente y los procedimientos de calidad que se aplican en este tipo de elementos, que parecen no estar resultando totalmente eficaces. Some of the most common problems in precast concrete structures are shown in this work, through examples and real situations. These problems are associated with an underestimation of the manufacturing and assembly tolerances during the design phase, as well as, with a lack of bracing or anchoring mechanisms to ensure its stability against horizontal actions. Additionally, the requirements of current standards and quality procedures that apply to this type of elements have been examined, which in our opinion are not being enough effective.

      PubDate: 2017-09-01T03:35:50Z
      DOI: 10.1016/j.hya.2017.07.001
       
  • La doble célula triangular: mejora sustancial de la resistencia a carga
           concentrada transversal en puentes empujados
    • Authors: Tomás Ripa Alonso
      Abstract: Publication date: Available online 23 August 2017
      Source:Hormigón y Acero
      Author(s): Tomás Ripa Alonso
      Este artículo presenta la mejora resistente frente a carga concentrada transversal que aporta una célula triangular acoplada al ala inferior, a modo de nervio de rigidez. Los análisis con un modelo híbrido de elementos finitos permiten identificar el mecanismo de resistencia local y el mecanismo adicional de contribución de los rigidizadores por flexión del nervio. Se propone un modelo de cálculo que cuantifica esta mejora, solventando la insuficiencia que presenta la vigente formulación normativa. Las conclusiones se aplican a un caso real, consistente en diseñar el empuje del viaducto del río Sava en Croacia, suprimiendo toda la rigidización longitudinal. This paper deals with the improvement in patch loading resistance achieved by a bottom triangular cell attached to a T-shaped girder flange. The analyses performed with hybrid non-linear finite element models reveal two resistant mechanisms: web resistance and an additional contribution of vertical stiffeners induced by the bottom cell stiffness. A numerical model is proposed for evaluating the contribution of vertical stiffeners to patch loading resistance, in order to improve present formulation deficiency. The conclusions are applied to a real case design of a launched bridge, the viaduct across river Sava in Croatia, eliminating all longitudinal web stiffeners.

      PubDate: 2017-09-01T03:35:50Z
      DOI: 10.1016/j.hya.2017.06.002
       
  • Propuesta de unión viga-pilar mediante pernos conectores: Análisis por
           Método de Elementos Finitos y Ensayos Experimentales
    • Authors: Antonio Aznar López; José I. Hernando García; Jesús Ortiz Herrera; Jaime Cervera Bravo
      Abstract: Publication date: Available online 18 August 2017
      Source:Hormigón y Acero
      Author(s): Antonio Aznar López, José I. Hernando García, Jesús Ortiz Herrera, Jaime Cervera Bravo
      El objetivo principal de este trabajo consiste en proponer una alternativa más económica y viable para las uniones entre forjados de hormigón y pilares metálicos. La solución que se propone en este trabajo consiste en un grupo de pernos conectores destinados a transferir las solicitaciones desde los forjados de hormigón hasta los pilares metálicos; consiste en una unión primaria, que es válida tanto para vigas de hormigón como para losas, y que aporta numerosas ventajas respecto a las uniones habituales, entre las que se destaca la simplicidad, la posibilidad de industrialización, la seguridad y la alta capacidad de transmisión de cortante. The main aim of this work is to propose an alternative beam-to-column joint for use in building structures. This novel solution consists of a group of headed studs, and has been conceived to connect reinforced concrete floors to steel columns. It is a primary structural joint and it can be used both in conventional concrete beams and in slabs. The alternative approach presented in this work offers significant benefits compared to conventional joints. Some of these advantages are regarding simplicity, industrialisation possibilities, shear strength capacity, as well as the excellent weld safety due to the use of headed studs.

      PubDate: 2017-09-01T03:35:50Z
      DOI: 10.1016/j.hya.2017.04.018
       
  • Influencia de la orientación y la densidad de las fibras en la
           resistencia a tracción por flexión de hormigones
    • Authors: Jesús Mínguez Algarra; Dorys González Cabrera; Miguel Ángel Vicente Cabrera
      Abstract: Publication date: Available online 28 July 2017
      Source:Hormigón y Acero
      Author(s): Jesús Mínguez Algarra, Dorys González Cabrera, Miguel Ángel Vicente Cabrera
      Esta investigación se centra en analizar la relación que existe entre la orientación de las fibras y su densidad, por un lado, y la resistencia residual a tracción del hormigón reforzado, por otro. Para ello se fabricó una viga pared de hormigón reforzado con fibras metálicas, del que se extrajeron una serie de probetas prismáticas, de diferentes zonas. En primer lugar, todas las probetas fueron sometidas a un ensayo de tomografía axial computarizada (CT-Scan) para obtener la posición y orientación de sus fibras. A continuación, dichas probetas fueron sometidas al ensayo de flexión en tres puntos, de acuerdo a la normativa vigente, y se obtuvieron los valores de resistencia residual a tracción del hormigón (fR,i). In this paper, a study is conducted on the relationship between fibre orientation and fibre volume fraction and residual flexural tensile strength. In order to do this, one steel fibre reinforced concrete deep beam was casted. A set of prismatic specimens were extracted from different parts of this deep beam and with different orientations. First, all these specimens were subjected to a computed tomography (CT-Scan) study in which the fibre orientation and fibre volume fraction was determined. These specimens were then subjected to 3-point bending testing, in accordance with current standards, and the residual flexural tensile strengths values were obtained (fR,i).

      PubDate: 2017-07-28T11:09:11Z
      DOI: 10.1016/j.hya.2017.05.007
       
  • Estaciones enterradas de la línea 3 del Metro de Riad. Estaciones
           profundas con contrabóveda
    • Authors: Francisco Javier Gómez Corral; Antonio Martín Colecha; Gonzalo Zarrabeitia Ullibarri
      Abstract: Publication date: Available online 27 July 2017
      Source:Hormigón y Acero
      Author(s): Francisco Javier Gómez Corral, Antonio Martín Colecha, Gonzalo Zarrabeitia Ullibarri
      Las estaciones profundas con contrabóveda de la línea 3 de Metro de Riad están formadas por cuatro niveles subterráneos que constituyen la caja profunda, donde un gran atrio central configura el flujo peatonal. El sistema constructivo es bottom-up, y en uno de los casos la excavación se realiza con la ayuda de una pantalla de pilotes secantes con diferentes niveles de apeo. La estación se cierra con una contrabóveda de hormigón armado con llaves de cortante continuas en los laterales que contrarrestan el empuje del agua (mecanismo arco). El resto de niveles se ha diseñado con vigas prefabricadas pretensadas y losas de compresión in situ, con un funcionamiento estructural evolutivo. The deep stations with counter-vault of Riyadh Metro Project Line 3 are formed by four underground levels that constitute the deep box, where a central atrium configures all passenger flows. The temporary works consist of a bottom-up construction method. In one station, a continuous retaining wall has been designed based on secant piles with three retaining levels. The bottom slab of the deep box is a reinforced concrete counter-vault with continuous shear keys that resist the water pressure transmitting the axial compressive forces to the rock (arch mechanism). The intermediate and top levels have been designed with precast pre-stressed beams and concrete in-situ slabs, with an evolutional structural behaviour.

      PubDate: 2017-07-28T11:09:11Z
      DOI: 10.1016/j.hya.2017.05.008
       
  • Ripollet viaduct for the Bus-HOV lane on the C-58 motorway (Barcelona)
    • Authors: José Antonio Llombart Jaques
      Abstract: Publication date: Available online 8 July 2017
      Source:Hormigón y Acero
      Author(s): José Antonio Llombart Jaques
      Recently built for the Bus-HOV lane on the C-58 Motorway, the Viaduct consists of an elevated structure, the piers of which are located in the space between the two decks of an existing viaduct. The new deck consists of a spatial steel tubular structure that supports a concrete platform, on which the carriageway runs. Unknown for this type of structure, the design of the construction system involved erecting the piers and deck 100% without the support of the existing viaduct decks which were only occasionally used for auxiliary aid jobs, control and inspection so that traffic was not cut off at any time.

      PubDate: 2017-07-21T17:04:58Z
      DOI: 10.1016/j.hya.2017.05.005
       
  • Análisis de un puente de tablero continuo sujeto a múltiples
           excitaciones sísmicas
    • Authors: Alexander Kagermanov
      Abstract: Publication date: Available online 5 July 2017
      Source:Hormigón y Acero
      Author(s): Alexander Kagermanov
      En fase de diseño es habitual suponer que los desplazamientos sísmicos del terreno son uniformes entre apoyos de la estructura. Sin embargo, este no es necesariamente el caso para grandes estructuras, como viaductos, cuando existen importantes variaciones topográficas y/o geológicas a lo largo de la traza. En el presente caso se compara la respuesta de un puente continuo de 850m de longitud situado en una zona sísmica de PGA=0,1g, sometido a una serie análisis dinámicos con acelerogramas sintéticos, con y sin variación espacial del sismo, obtenidos por propagación de ondas hacia la superficie de cada apoyo. In the design phase, seismic ground displacements are usually assumed to be uniform between the structure supports. However, this is not necessarily the case for extended structures, such as bridges, especially when there are different soil and/or topographic conditions along the structure. In the present study, the response of an 850m continuous bridge located in a seismic region of PGA=0.1g, is investigated. A set of synthetic accelerograms is generated from 1D site-response analysis at each bridge support. Furthermore, a number of linear time-history analyses are performed, with and without uniform support excitation, in order to quantify its influence on the bridge performance.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.05.015
       
  • Influencia del tipo de rótula plástica en el análisis no lineal de
           estructuras de hormigón armado
    • Authors: Andrés Tomás López López; Antonio Tomás Espín; Gregorio Sánchez Olivares
      Abstract: Publication date: Available online 5 July 2017
      Source:Hormigón y Acero
      Author(s): Andrés Tomás López López, Antonio Tomás Espín, Gregorio Sánchez Olivares
      La obtención de resultados precisos en un análisis estático no lineal requiere una adecuada modelización de las rótulas plásticas generadas en la estructura, para lo que conviene emplear expresiones empíricas capaces de modelizar la relación fuerza-deformación de la rótula. El objetivo principal de esta contribución es estudiar la influencia de diferentes modelos de rótula plástica en el comportamiento no lineal de estructuras aporticadas de hormigón armado. Se realizan análisis no lineales considerando diversos modelos de rótula, como el incluido en el código FEMA-356 y dos modelos desarrollados a partir de expresiones empíricas calibradas con diferentes bases de ensayos experimentales. Los resultados obtenidos muestran que el modelo propuesto por los autores refleja con mayor precisión el comportamiento de edificios convencionales de hormigón armado situados en zonas sísmicas. Además, el modelo puede emplearse para contrastar los resultados ofrecidos por otros modelos incluidos en la diversa normativa de diseño sísmico de edificación. An adequate modelling of the plastic hinges generated during the pushover analysis is crucial in order to obtain accurate results. Thus, empirical expressions must be used appropriately in order to model the generalised force-deformation relationship of plastic hinges. The main aim of this article is to study the influence of different plastic hinge models on the non-linear structural behaviour of reinforced concrete structures. To that end, several non-linear analyses have been performed using the following plastic hinge models: the model included in the code FEMA-356 and two additional models developed by some researchers by using empirical expressions calibrated with different experimental data. The results obtained show that plastic hinges modelled with empirical expressions can be used to more precisely model the behaviour of structural elements in ordinary buildings located in seismic areas, and to compare with the results offered by the models included in seismic building design codes.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.04.006
       
  • Mantenimiento y rehabilitación de sistemas de atirantamiento:
           tecnologías, patologías tipo, inspección, monitorización y
           reparaciones
    • Authors: Nicolas Trotin; Jorge Sánchez de Prado; Patrick Ladret; Pablo Vilchez Motino
      Abstract: Publication date: Available online 2 July 2017
      Source:Hormigón y Acero
      Author(s): Nicolas Trotin, Jorge Sánchez de Prado, Patrick Ladret, Pablo Vilchez Motino
      Este artículo trata de las tecnologías más comunes de sistemas de atirantamiento y las principales patologías que se han registrado a lo largo de las inspecciones llevadas a cabo en los últimos años. A medida que se va observando y conociendo mejor la variada casuística de problemas en tirantes, se desarrollan nuevas técnicas de inspección de sus distintos componentes y nuevas soluciones para su mantenimiento o mejora. Las publicaciones al respecto son numerosas, así que este artículo se centrará en los métodos de inspección y mantenimiento con aplicaciones más recientes This article presents the most common technologies for stay cables systems, and the main defects that have been registered during the inspections carried out in the last few years. When the defects on stay cables are observed and their understanding improves, new methods for the inspection of the components of a stay cable are developed, as well as new solutions for their maintenance and upgrade. There are many publications on this issue, thus this article will mainly focus on the inspection and maintenance methods more recently developed and used on site.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.05.014
       
  • Puente de La Florida. Conexión del barrio de La Florida con la calle
           Martínez Cachero, Oviedo
    • Authors: Guillermo Capellán Miguel; Alejandro Godoy Ansótegui; Marianela García Pérez; Santiago Guerra Soto; Juan Ruiz Escobedo; Julio González Zalduondo
      Abstract: Publication date: Available online 30 June 2017
      Source:Hormigón y Acero
      Author(s): Guillermo Capellán Miguel, Alejandro Godoy Ansótegui, Marianela García Pérez, Santiago Guerra Soto, Juan Ruiz Escobedo, Julio González Zalduondo
      El Puente de La Florida es un proyecto promovido por el Ayuntamiento de Oviedo para conectar los barrios de La Florida y el Parque del Oeste. El diseño representa una novedad en los puentes urbanos, resolviendo la conexión mediante una rotonda volada semicircular suspendida de su borde interior mediante un sistema de péndolas. Los cables de suspensión y de retenida cuelgan de un cable principal cerrado, con forma de lazo, que se ancla en un mástil central articulado. La estructura se completa con un viaducto de acceso de hormigón postesado, un vano de conexión mixto entre rotonda y viaducto, dos pasarelas voladas y un anillo de retenida de hormigón. La Florida Bridge is a project promoted by Oviedo City Council to connect La Florida and Western Park neighborhoods. The design is an innovation in urban bridges, solving the connection with a flying semi-circle roundabout suspended from its inner edge by a system of cables. Hangers and backstays hang from a loop shaped closed main cable, anchored to a central articulated mast. The structure is completed with a post-tensioned concrete approach viaduct, a composite connection span between roundabout and viaduct, two cantilever footbridges and a concrete counterweight ring.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.05.011
       
  • Cálculo de torres atirantadas sin utilizar elementos finitos
    • Authors: Pablo M. Páez; Berardi Sensale
      Abstract: Publication date: Available online 30 June 2017
      Source:Hormigón y Acero
      Author(s): Pablo M. Páez, Berardi Sensale
      En este trabajo se desarrolla una nueva formulación, basada en el método de la viga-columna, para el análisis de mástiles atirantados. El método propone el cálculo de las deformaciones producidas por los efectos de segundo orden a partir de las funciones de estabilidad. A tales efectos, la torre se modela como una viga-columna equivalente, continua, sobre apoyos elásticos no-lineales, cuyas rigideces axial, flexional y de corte se calculan según sea el patrón de construcción de la torre. Los cables son reemplazados por apoyos elásticos no-lineales cuya constante elástica se obtiene a partir de la utilización de módulo de elasticidad secante de los cables. A los efectos de validar el método propuesto se realiza un estudio comparativo analizando un mástil atirantado de 150m de altura mediante el método de los elementos finitos con el programa comercial SAP2000. Based on the equivalent beam-column method, this paper develops a new formulation for the analysis of guyed towers. The method proposes the calculation of the second order deformation using the stability functions. For this purpose, the tower is modelled as a continuous equivalent beam-column, on non-linear elastic supports, for which the axial stiffness, flexural stiffness, and shear stiffness are calculated depending on the pattern construction of the tower. The guys are replaced by non-linear elastic supports for which the spring constant is obtained from the secant modulus of the cables. In order to validate the proposed method, a comparative study is carried out between the proposed method and the finite element method on a 150metre-high guyed tower using the SAP2000 software.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.05.012
       
  • Puente de Barra Vieja, México
    • Authors: Leonardo Fernández Troyano; Guillermo Ayuso Calle; Lucía Fernández Muñoz; Alberto Muñoz Tarilonte; Raúl González Aguilar
      Abstract: Publication date: Available online 28 June 2017
      Source:Hormigón y Acero
      Author(s): Leonardo Fernández Troyano, Guillermo Ayuso Calle, Lucía Fernández Muñoz, Alberto Muñoz Tarilonte, Raúl González Aguilar
      El puente de Barra Vieja está situado en Lomas de Chapultepec, al sur de Acapulco, en la desembocadura del río Papagayo, en el estado de Guerrero, México. La estructura proyectada es un puente de velas de hormigón con una luz principal de 220m. La longitud total del puente es de 470m y 5 vanos de luces de 30+40+90+220+90m. La estructura se proyectó sin pilas en el cauce dado que la cimentación era inviable debido a posibles fenómenos de licuefacción de los terrenos bajo la acción sísmica, que en esta zona es muy elevada. The Barra Vieja Bridge is situated in Lomas de Chapultepec, south of Acapulco, over the Papagayo River, in the Guerrero state, Mexico. The structure is a bridge of ‘concrete sails’ with a main span of 220m. The total length of the bridge is 470m, with five spans of 30+40+90+220+90m. The structure was projected without piers in the riverbed as foundations were not feasible due to the liquefaction risks of the ground under the seismic action, which in this zone is very high.

      PubDate: 2017-07-08T00:52:59Z
      DOI: 10.1016/j.hya.2017.05.013
       
  • Modelo analítico para el análisis de la flexión y la fisuración en
           secciones de hormigón armado como alternativa al diagrama de pivotes
    • Authors: Jacinto Ruiz Carmona; Gonzalo Ruiz López
      Abstract: Publication date: Available online 27 June 2017
      Source:Hormigón y Acero
      Author(s): Jacinto Ruiz Carmona, Gonzalo Ruiz López
      En el presente trabajo se propone un modelo analítico basado en Mecánica de Fractura aplicada al hormigón armado que permite estudiar el fallo de secciones sometidas a flexión. Se incorpora una ecuación de compatibilidad que relaciona la apertura de fisura con el alargamiento de la barra de refuerzo; de esta forma la adherencia entre hormigón y acero se incorpora como parámetro al modelo. La formulación propuesta permite obtener la relación entre el momento aplicado en la sección y la apertura de fisura correspondiente. Asimismo, permite evaluar la capacidad de rotación de las secciones de hormigón armado. An analytical model is presented in order to study the failure of reinforced concrete sections subjected to bending, based on fracture mechanics concepts applied to concrete. It determines the stress in the reinforcement by introducing an additional compatibility equation that relates the crack opening with the stretching of the reinforcement. The proposed formulation assumes a cohesive behaviour of the fractured concrete introducing a force that depends on the cohesive stresses at the crack tip. Model results are validated against several beam tests. The crack opening and the rotational capacity of reinforced concrete sections can be obtained with the model.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.007
       
  • Estudio de la sensibilidad a su propia deformación de escorias de alto
           horno activadas alcalinamente y reforzadas con fibra de carbono
    • Authors: F. Javier Baeza de los Santos; Josep Lluís Vilaplana Abad; Óscar Galao Malo; Pedro Garcés Terradillos
      Abstract: Publication date: Available online 26 June 2017
      Source:Hormigón y Acero
      Author(s): F. Javier Baeza de los Santos, Josep Lluís Vilaplana Abad, Óscar Galao Malo, Pedro Garcés Terradillos
      La adición de fibras de carbono en materiales cementicios permite, además de mejorar sus prestaciones mecánicas, su utilización en otras funciones no estructurales, p.ej., sensor de deformaciones. Al incluir adiciones crecientes de fibras en pastas de escoria de alto horno activada alcalinamente se consiguió mejorar su resistencia a compresión y flexión, reducir su retracción por secado, y relacionar su resistividad con la deformación sufrida por el material en ciclos de compresión. Sin embargo, para optimizar la percepción de su deformación es necesario modificar las condiciones de saturación del material, al no funcionar correctamente estando saturado. The addition of carbon fibres is used in cement composite materials with a twofold objective: enhancement of their mechanical performance, and functionalisation of the composite, e.g. as strain sensor. Alkali-activated blast furnace slag pastes were reinforced with carbon fibres, which increased bending and compressive strengths, controlled drying shrinkage, and their resistivity could be related to strains during cyclic compression tests. However, in order to optimise this strain self-sensing property, changes in water saturation of samples are necessary, because fully saturated samples did not work properly as a strain sensor.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.008
       
  • Estrategias de intervención estructural sobre edificios del patrimonio
           histórico industrial de Madrid: realizaciones recientes
    • Authors: Juan Rey Rey; Pablo Vegas González; Jacinto Ruiz Carmona
      Abstract: Publication date: Available online 26 June 2017
      Source:Hormigón y Acero
      Author(s): Juan Rey Rey, Pablo Vegas González, Jacinto Ruiz Carmona
      Madrid cuenta con un número importante de edificaciones industriales de carácter histórico de gran valor arquitectónico y patrimonial que, una vez cesado su uso industrial original, habían quedado durante largo tiempo en desuso. Afortunadamente, en los últimos años han sido varias las actuaciones encaminadas a recuperar ese importante patrimonio histórico, destinando los edificios a nuevos usos que requieren en muchos casos grandes transformaciones tanto a nivel arquitectónico como estructural, las cuales deben acometerse no solo pensando en cumplir la nueva función, sino en preservar y potenciar el valor de las edificaciones existentes. El presente artículo expone algunas estrategias comunes aplicadas a la intervención estructural sobre varios edificios en los que dicha tarea ha sido desarrollada por Mecanismo Ingeniería. Madrid has a large number of industrial buildings with historical character and great architectural heritage value that after their original industrial activity have been closed for a long period of time. Fortunately, in recent years, several actions have been taken to recover this important historical heritage. These buildings have new uses, which in many cases require major architectural and structural transformations, and these transformations must be done, not only thinking of fulfilling the new role, but also preserving and enhancing the value of existing buildings. This paper discusses some common strategies applied to structural interventions on several buildings in which this task has been developed by Mecanismo Structural Engineering.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.05.009
       
  • Hormigón autocompactante con fibras para premoldeados
    • Authors: Gemma Rodríguez de Sensale; Luis Segura-Castillo; Iliana Rodríguez Viacava; Rosana Rolfi Netto; Darío Miguez Passada; María Esther Fernández Iglesias
      Abstract: Publication date: Available online 26 June 2017
      Source:Hormigón y Acero
      Author(s): Gemma Rodríguez de Sensale, Luis Segura-Castillo, Iliana Rodríguez Viacava, Rosana Rolfi Netto, Darío Miguez Passada, María Esther Fernández Iglesias
      Como referencia se tomó un hormigón autocompactante (HAC) usual en premoldeados. Las variables analizadas fueron el tipo de fibras y su cuantía. Se estudiaron propiedades de los hormigones en estado fresco y endurecido. La incorporación de fibras en estado fresco influye significativamente en la reología; en estado endurecido mejora la resistencia mecánica en relación al HAC sin fibras. En relación a la permeabilidad al aire y la resistencia a penetración de cloruros, los resultados obtenidos no difieren significativamente entre sí. A self-compacting concrete (SCC), which is usual in local precast, was used as reference. The variables analysed were the type of fibres and their amount. Properties of concretes in fresh and hardened state were studied. The use of fibres, compared to the SCC without fibres, significantly influences the rheology in the fresh state and improves mechanical resistance in the hardened state. As regards the air permeability and the resistance to chloride penetration, the results obtained do not differ significantly between the two states.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.017
       
  • Empuje con doble curvatura, planta y alzado, en viaducto de línea de alta
           velocidad Orense-Monforte-Lugo, Variante de San Julián
    • Authors: Carlos J. Bajo Pavía; Marta Pérez Escacho; Juan Sevillano Gacho
      Abstract: Publication date: Available online 24 June 2017
      Source:Hormigón y Acero
      Author(s): Carlos J. Bajo Pavía, Marta Pérez Escacho, Juan Sevillano Gacho
      El proceso constructivo mediante empuje de tablero para alineación curva en planta y una rasante mixta, ha requerido la adaptación del método tradicional de empuje hacia un método híbrido que, respetando las ventajas inherentes al sistema constructivo, ha permitido trabajar en condiciones geométricas no habituales. El establecimiento del empuje en dos fases: empuje sobre trayectoria transitoria afectada por la propia flexibilidad vertical del tablero, y la posterior rectificación de cota a nivel de apoyos mediante procedimiento secuencial de descenso controlado, ha permitido dar viabilidad a este método con un resultado global altamente competitivo. The construction sequence by means of incremental-launching for curved plan alignment and a straight and convex parabolic elevation, has required the adaptation of the traditional method of launching towards a hybrid method that, preserving the inherent advantages of the primary construction system, has allowed to work with these unusual geometrical conditions. The establishment of the launching procedure in two phases: launching on a transitional trajectory affected by the vertical flexibility of the deck, and the further rectification of the deck elevation by a sequential controlled support descent, has provided viability for this method with a highly competitive result.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.05.010
       
  • Structures with chloride attack. Application of cathodic protection in the
           bridge to Illa de Arousa
    • Authors: José Antonio Becerra Mosquera; José Enrique Pardo Landrove; José Manuel Millán Pérez; Diego Carro-Lopez
      Abstract: Publication date: Available online 21 June 2017
      Source:Hormigón y Acero
      Author(s): José Antonio Becerra Mosquera, José Enrique Pardo Landrove, José Manuel Millán Pérez, Diego Carro-Lopez
      The bridge of this project is a reinforced concrete structure of 1980m divided in 40 spans. The deck is a single-cell box girder and a total width of 13m including sidewalks and shoulders. After 25 years in marine environment, the structure showed reinforcement corrosion, especially in piles and deck bottom. It was repaired with four types of intervention: conventional reparation with patches, corrosion inhibitors, cathodic protection with sacrificial anodes and an hybrid cathodic protection system with an initial impressed current and galvanic current. In this research it is described the refurbishment and comparative results of the evolution of the repairs and therefore data of the corrosion progression and its effect in service life. The hybrid system, by the moment, is the system with the best results.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.05.006
       
  • Estudio de la influencia de los principales parámetros que definen un
           solapo de barras
    • Authors: Ismael Vieito; Fernando Martínez-Abella; Javier Eiras-López; Manuel F. Herrador; Juan Luís Pérez-Ordóñez
      Abstract: Publication date: Available online 21 June 2017
      Source:Hormigón y Acero
      Author(s): Ismael Vieito, Fernando Martínez-Abella, Javier Eiras-López, Manuel F. Herrador, Juan Luís Pérez-Ordóñez
      En este documento se recogen los resultados de una campaña experimental en la que se han estudiado los principales parámetros geométricos que definen un solapo de barras: diámetro de la armadura, recubrimiento, separación entre barras solapadas y distancia entre familias de barras solapadas. Para realizar esta investigación se recurrió a un ensayo de arrancamiento múltiple, recientemente desarrollado en la Universidade da Coruña, y se planteó una metodología estadística basada en el diseño de experimentos. En estas condiciones, el recubrimiento y la distancia entre familias de barras solapadas se muestran como los factores más determinantes. This document shows the results of an experimental work in which the main geometric factors defining lap splices were studied. The diameter of the reinforcement bar, the concrete cover, the gap between the two overlapped bars and the distance between families of overlapped bars were taken into account. The multiple pull-out test, recently developed at the University of A Coruna, was used to perform the experimental work, in combination with a statistic methodology based on the design of experiments techniques. In these conditions, the concrete cover and the distance between families of overlapped reinforcement bars resulted to be the most important factors.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.05.003
       
  • Numerical analysis of reinforced concrete beams strengthened in shear by
           externally bonded (EB) fibre reinforced polymer (FRP) sheets
    • Authors: Eva Oller Ibars; Denise Ferreira; Antonio Marí Bernat; Jesús Miguel Bairán García
      Abstract: Publication date: Available online 20 June 2017
      Source:Hormigón y Acero
      Author(s): Eva Oller Ibars, Denise Ferreira, Antonio Marí Bernat, Jesús Miguel Bairán García
      In this paper, a fibre beam model previously developed by the authors for the nonlinear analysis of strengthened elements, including the effects of shear, is used to predict the response of reinforced concrete (RC) beams strengthened in shear with fibre reinforced polymers (FRP) sheets. This model has been extended not only for wrapped configurations but also for debonding failure in order to allow for its application to beams strengthened with U-shaped and side-bonded configurations. When simulating existing experimental tests, the model reproduces, with reasonable accuracy the behavior of the beams, being then a useful tool for practical engineering.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.022
       
  • Analysis of shear resisting actions by means of optimization of strut and
           tie models taking into account crack patterns
    • Authors: Jesús Miguel Bairán; Antonio Marí; Antoni Cladera
      Abstract: Publication date: Available online 20 June 2017
      Source:Hormigón y Acero
      Author(s): Jesús Miguel Bairán, Antonio Marí, Antoni Cladera
      The shear resisting actions in reinforced concrete elements without transverse reinforcement is analyzed by means of optimized strut-and-tie models with concrete ties. Biaxial failure criteria are used for uncracked and cracked regions. The stress transfer capacity across cracks is accounted for by including the inclination between the stress field and the crack opening and sliding. An experimental case-study is analyzed. It is shown that that different shear resisting actions can occur in different regions of the beam. The strut-and-tie scheme in the critical region is consistent with the Multi-Action Shear Strength Model (MASM).

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.009
       
  • Puentes mixtos continuos de ferrocarril en zona sísmica en el norte
           de Argelia
    • Authors: Diego Cobo del Arco; Ingrid Raventós Dudous; Steffen Mohr
      Abstract: Publication date: Available online 20 June 2017
      Source:Hormigón y Acero
      Author(s): Diego Cobo del Arco, Ingrid Raventós Dudous, Steffen Mohr
      El proyecto de puentes de ferrocarril continuos en zona sísmica es complejo, puesto que los criterios de interacción vía-estructura requieren esquemas estructurales muy rígidos en la dirección longitudinal, lo que genera en situación sísmica esfuerzos muy grandes en los puntos fijos y dimensionamientos de la subestructura poco económicos. La utilización conjunta de un tablero mixto (para reducir la masa) y de aislamiento sísmico (mediante aparatos de acero de tipo elastoplástico) ha permitido construir de manera competitiva 3 viaductos ferroviarios en el norte de Argelia adaptándose a los requisitos impuestos por la administración ferroviaria argelina. The design of continuous railway bridges in an active seismic zone is complex, due to rail-structure interaction criteria that require very rigid structural systems in the longitudinal direction. This generates large seismic forces at the fixed points and usually results in an uneconomical substructure design. The use of a composite deck (in order to reduce the mass), together with seismic isolation (using steel devices with elastic-plastic properties) has permitted the construction of 3 railway viaducts in Northern Algeria, adapting them to the requirements imposed by the Algerian railway administration.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.024
       
  • Robustez estructural: la cualidad que echó de menos Ribera en 1905
    • Authors: Eduardo Díaz-Pavón Cuaresma; Javier León González; Jorge Ley Urzáiz
      Abstract: Publication date: Available online 19 June 2017
      Source:Hormigón y Acero
      Author(s): Eduardo Díaz-Pavón Cuaresma, Javier León González, Jorge Ley Urzáiz
      El 8 de abril de 1905 se produjo el colapso de la cubierta del Tercer Depósito del Canal de Isabel II, hecho terrible que provocó la muerte de 30 personas durante la construcción y dio pie a una polémica extraordinaria de la que sin embargo no se extrajeron conclusiones convincentes. A los efectos del presente artículo, este episodio es un buen ejemplo de estructura proyectada con ausencia de análisis de robustez, cualidad que se supone de implícita satisfacción si se cumplen los requisitos normativos de los códigos modernos, pero que fue obviada por el proyectista de la cubierta, el insigne y emprendedor José Eugenio Ribera, lo que motivó que un defecto en la ejecución tuviera consecuencias desproporcionadas. On April 8th 1905 the roof of the 3rd reservoir of the Canal de Isabel II in Madrid collapsed, being one of the most disastrous accidents that have occurred in the history of Spanish construction: 30 people died and 60 were injured. At the time, the event was subject to great speculation and investigation, both in the engineering society as well as in the court of law. Despite this, there were no convincing conclusions as to the cause of such a disaster. As far as the scope of this article is concerned, this collapse serves as a great example of the disproportionate consequences a lack of structural robustness can have. Modern codes contain specific requirements for which compliance is believed to implicitly guarantee a robust design. However, such requirements were not accounted for by the designer José Eugenio Ribera, one of Spain's leading civil engineers. As a result, a single defect in execution could lead to disastrous consequences.

      PubDate: 2017-06-27T17:06:33Z
      DOI: 10.1016/j.hya.2017.04.011
       
  • Problemática en la inspección de puentes metálicos antiguos
    • Authors: Ismael Carpintero García
      Abstract: Publication date: Available online 17 June 2017
      Source:Hormigón y Acero
      Author(s): Ismael Carpintero García
      La inspección de puentes metálicos antiguos tiene como uno de sus objetivos principales identificar los posibles riesgos de que se produzcan fallos frágiles que puedan resultar catastróficos. Son diversos los factores que influyen en este problema: la baja tenacidad que en ocasiones tienen los materiales metálicos con los que fueron construidos; el incremento de las cargas que soportan (tanto permanentes como vivas); la posibilidad de desarrollar fisuras por fatiga habida cuenta de que los detalles de sus uniones se diseñaron cuando aún no se conocía este problema; el desarrollo de la corrosión, que debilita secciones resistentes y puede producir concentraciones de tensiones, etc. Se presentan una serie de puentes en los cuales esta problemática se ha puesto de manifiesto de distinta manera. Finalmente se propone a partir de su análisis un conjunto de actuaciones complementarias que pueden desarrollarse sin grandes incrementos de coste, facilitando la estima del riesgo de la estructura a desarrollar este tipo de fallos. One of the main objectives in the inspection of old metal bridges is to identify the risk of brittle crack failures. There are many factors involved in this problem: the usual low toughness in old metal structures, the increased loads supported by the old bridges (permanent and also live loads); the possibility of fatigue fissures appearing, taking into account that their connection details were designed when this problem was unknown; development of corrosion, which could weaken sections, create tensile concentrations, etc. Some bridges with those problems are then analysed. Finally, from this analysis, some complementary actions are proposed that would lead to a better risk assessment of these bridge structures without a great increase in costs.

      PubDate: 2017-06-19T20:40:17Z
      DOI: 10.1016/j.hya.2017.04.020
       
  • New opportunities for the conceptual design of material-efficient
           antifunicular structures
    • Authors: Leonardo Todisco; Hugo Corres
      Abstract: Publication date: Available online 17 June 2017
      Source:Hormigón y Acero
      Author(s): Leonardo Todisco, Hugo Corres
      Non-structural design criteria (e.g., usability, architectural needs, esthetics) may prohibit the selection of purely funicular or anti-funicular shapes. In response to this issue, this paper illustrates the possibility of achieving an axial-only behavior, even if the geometry departs from the ideally bending-free shape. This is achieved by adding forces through an external post-tensioning system, with a layout defined through graphic statics. The paper briefly illustrates examples of this approach and its implementation within a design-driven software where structural performance and geometric variation are embedded within an interactive and parametric working environment.

      PubDate: 2017-06-19T20:40:17Z
      DOI: 10.1016/j.hya.2017.04.010
       
  • Diseño y construcción del puente Frank Gehry. Primer acceso a la nueva
           isla de Zorrotzaurre en Bilbao
    • Authors: Pablo Alfonso Domínguez; Guillermo Capellán Miguel; Héctor Beade Pereda; Marianela García Pérez; Alejandro Godoy Ansótegui; Jorge López Tamames; Víctor José García Martín
      Abstract: Publication date: Available online 16 June 2017
      Source:Hormigón y Acero
      Author(s): Pablo Alfonso Domínguez, Guillermo Capellán Miguel, Héctor Beade Pereda, Marianela García Pérez, Alejandro Godoy Ansótegui, Jorge López Tamames, Víctor José García Martín
      Nombrado Frank Gehry como homenaje del Ayuntamiento de Bilbao, este puente materializa la primera conexión de la futura isla de Zorrotzaurre con el resto de la trama urbana, salvando el curso de agua mediante un vano principal de 76,9m y una anchura media de 28m. Es un puente de especial interés por su sistema estructural, que combina un esquema de viga Fink invertida con una viga de tres vanos con canto variable, sin precedentes en puentes para tráfico rodado. La construcción del puente se realiza sobre tierra firme, contando durante la puesta en carga con instrumentación en tiempo real de todos los elementos con acceso remoto por Internet. Named after Frank Gehry as homage by Bilbao's City Council, the bridge will materialize the first connection of this island with the rest of the urban fabric. It saves the watercourse with a main span of 76.9m and an average width of 28m, using an innovative design concept which combines two structural schemes: an inverted Fink Truss and a three span variable height beam. It is a bridge of major interest due to the structural type used, without any precedent in road bridges. The bridge construction is carried out on land, counting on real time monitoring of all structural elements during bridge cables tensioning, with Internet remote access.

      PubDate: 2017-06-19T20:40:17Z
      DOI: 10.1016/j.hya.2017.04.021
       
  • Modelos mecánicos para el diseño de encepados de tres y cuatro pilotes
           solicitados por cargas centradas y excéntricas
    • Authors: Miguel Luis; Rubio Pedro Miguel Sosa
      Abstract: Publication date: Available online 10 June 2017
      Source:Hormigón y Acero
      Author(s): Lucía Miguel Tórtola, Luis Pallarés Rubio, Pedro Miguel Sosa
      A partir de los resultados obtenidos de ensayos experimentales propios sobre 30 encepados, solicitados por carga centrada y excéntrica, se proponen dos modelos de bielas y tirantes (MBT) complementarios: uno de descarga directa a los pilotes y otro adicional para captar el efecto de la armadura secundaria horizontal y vertical. Estos MBT definen la carga de plastificación del sistema de armaduras dispuesto, pero el posterior incremento de carga registrado tras la plastificación queda limitado por la rotura por punzonamiento de cada encepado. Se presenta una formulación de punzonamiento basada en la del Código Modelo 2010, adaptando los parámetros que caracterizan la rotura de los encepados de pilotes. Se obtiene así una propuesta de diseño segura, más racional y con un coeficiente de variación menor que el que proporcionan los MBT tradicionales. Using the results obtained from experimental trials on 30 pile caps tested under centric and eccentric loads, two complementary strut-and-tie models (STM) are proposed: the traditional STM by direct load on piles, and the new STM which describes the vertical thrust along sides of the pile caps. These STMs define the yielding load of the reinforcement, but further load increase after yielding is limited by the punching failure of each pile cap. A punching formulation based on Model Code 2010 is presented. Parameters that define the failure surface are adapted to the particular case of deep pile caps. Conservative predictions and a reduced coefficient of variation confirm the good agreement with the proposal.

      PubDate: 2017-06-10T16:34:44Z
       
  • Proyecto de ferrocarril Awash-Kombolcha-Hara Gebaya, Etiopía. Diseño
           orientado a obras en países en desarrollo
    • Authors: Maria Estany Blázquez; Alexandre Correia Paulo; Ricard Leal Baró
      Abstract: Publication date: Available online 7 June 2017
      Source:Hormigón y Acero
      Author(s): Maria Estany Blázquez, Alexandre Correia Paulo, Ricard Leal Baró
      Los proyectos localizados en países en desarrollo presentan dificultades logísticas que requieren una estrecha colaboración entre los equipos de proyecto y ejecución. El diseño debe resolver los problemas logísticos simplificando y reduciendo el número de operaciones a realizar in situ. Soluciones basadas en diseños modulares recurriendo a elementos metálicos prefabricados permiten minimizar los equipos y las operaciones a realizar in-situ reduciendo considerablemente los plazos de ejecución. El proyecto Awash-Kombolcha-Hara Gebaya incluye 59 puentes ferroviarios y 6 pasos superiores de carretera. Projects located in developing countries present logistic difficulties that require a close partnership between the design and construction teams. The design team needs to solve the logistic problems by simplifying and reducing the amount of in-situ operations. Modular design solutions using prefabricated steel elements minimise the teams and operations necessary in-situ, reducing considerably the execution deadlines. The Awash-Kombolcha-Hara Gebaya project includes 59 railway bridges and 6 road overpasses.

      PubDate: 2017-06-10T16:34:44Z
      DOI: 10.1016/j.hya.2017.05.002
       
  • Red Line South. Metro de Doha (Qatar). Estructuras singulares construidas
           in-situ de ancho o canto variable
    • Authors: Jordi Revoltós Fort; Javier Antón Díaz; Silvia Criado Catalina; Juan Miguel Cereceda Boudet; Manuel Palomo Herrero
      Abstract: Publication date: Available online 7 June 2017
      Source:Hormigón y Acero
      Author(s): Jordi Revoltós Fort, Javier Antón Díaz, Silvia Criado Catalina, Juan Miguel Cereceda Boudet, Manuel Palomo Herrero
      La Línea Roja Sur del Metro de Doha discurre elevada en viaducto en su mayor parte. Aunque se planteó como una sucesión de vanos tipo de fácil prefabricación, otros condicionantes obligaron a tramos complejos. Esto dio lugar a estructuras construidas in situ, unas de ancho variable (tanto isostáticas como continuas de 3 vanos) y otras de canto variable para alcanzar hasta 59m de luz en doble vía y 75m de luz en vía simple. De todas ellas, la estructura más compleja fue la de doble vía, pues presenta varios mecanismos resistentes complementarios, cuya aportación al comportamiento global depende de la relación de rigideces entre dichos mecanismos resistentes. The Doha Metro Red Line South runs on a viaduct along most of the line. At the beginning, the design consisted of typical precast spans, but external constraints made complex structures necessary. For this reason, several cast in-situ bridges were built. Some of them have variable width (either simply-supported decks or continuous ones up to three spans), whereas other bridges are of variable depth, so they can reach 59m for a double track section and 75m for single track. The most complex bridge is the variable-depth one for the double track railway because the structural behaviour depends on several resistant mechanisms.

      PubDate: 2017-06-10T16:34:44Z
      DOI: 10.1016/j.hya.2017.04.014
       
  • Hormigones de escorias activadas alcalinamente. Comportamiento
           mecánico y durable
    • Authors: Manuel Torres-Carrasco; Maria del Mar Alonso; Paz Guarner; Ana Zamora; Francisca Puertas
      Abstract: Publication date: Available online 30 May 2017
      Source:Hormigón y Acero
      Author(s): Manuel Torres-Carrasco, Maria del Mar Alonso, Paz Guarner, Ana Zamora, Francisca Puertas
      El trabajo tiene como objetivo evaluar las resistencias mecánicas y la durabilidad de hormigones de escorias activadas alcalinamente (AASC) utilizando como activador una disolución de silicato sódico hidratado. El comportamiento de estos hormigones en términos de resistencia y porosidad es comparable al rendimiento observado en los hormigones de cemento Portland. Los ensayos realizados mostraron que los hormigones de escoria activada alcalinamente exhibieron una buena durabilidad frente a la penetración de cloruros (multirrégimen UNE 83987) y un buen comportamiento de adherencia a barras de acero corrugado (ensayo de pull-out) comparable a los hormigones de cemento Portland. The present study aimed to evaluate the mechanical strengths and durability in alkali activated slag concretes (AASC) using a solution of sodium silicate hydrate as activator. The behaviour of these concretes, in terms of strength and development of porosity, was comparable to the performance observed in ordinary Portland cement concretes. The trials conducted in this study showed that alkali-activated slag concretes exhibited good durability against chloride permeability (UNE 83987) and good adherence behaviour of corrugated steel bars (pull-out test) comparable to Portland concretes.

      PubDate: 2017-05-31T14:03:24Z
      DOI: 10.1016/j.hya.2017.04.016
       
  • Aspectos particulares que condicionan la efectividad de los refuerzos de
           pilares
    • Authors: David Fernández Montes; Elena Díaz Heredia
      Abstract: Publication date: Available online 29 May 2017
      Source:Hormigón y Acero
      Author(s): David Fernández Montes, Elena Díaz Heredia
      Los refuerzos de pilares de hormigón armado más comunes, con hormigón o estructura metálica, han sido el zunchado o el encamisado del pilar existente. En los últimos años, en el caso de zunchado se ha incorporado el empleo de materiales compuestos (FRP) como material de refuerzo. En general, el dimensionamiento de cualquiera de estos refuerzos no es complejo, sin embargo, la resolución de sus detalles condiciona su efectividad. Aspectos aparentemente sencillos, como pueden ser el paso del axil al refuerzo o la continuidad de este, deben ser cuidadosamente evaluados. El presente artículo ilustra con ejemplos concretos algunos detalles de refuerzo que han sido obviados, poniendo en entredicho la validez del mismo. The upgrading techniques of reinforced concrete columns conventionally have been jacketing or confinement of the existing column using concrete or steel. In recent years the use of composite materials, or fibre-reinforced plastic (FRP), has been incorporated as an alternative material in upgrading solutions by confinement. Although there is no problem in the dimensioning of any of these solutions, the resolution of details has often influenced its effectiveness. Thus, apparently simple aspects, such as transmission of the axial force to the upgrading system, must be carefully evaluated. Using particular examples, this article illustrates some reinforcements that have been overlooked by calling its validation into question.

      PubDate: 2017-05-31T14:03:24Z
      DOI: 10.1016/j.hya.2017.04.013
       
  • Análisis de un caso de inestabilidad lateral de un viga de hormigón
           pretensado de gran luz en fase de izado
    • Authors: Albert de la Fuente Antequera; Sergio Henrique Pialarissi Cavalaro; Jesús Miguel Bairán García
      Abstract: Publication date: Available online 26 May 2017
      Source:Hormigón y Acero
      Author(s): Albert de la Fuente Antequera, Sergio Henrique Pialarissi Cavalaro, Jesús Miguel Bairán García
      Las mejoras tecnológicas de la prefabricación con hormigón han hecho competitivo el uso de vigas prefabricadas de luces cada vez mayores en comparación con otras alternativas. Sin embargo, el peso de las vigas es limitante en las operaciones de izado y transporte, por lo que se tiende a reducir el ancho de las alas, produciendo elementos más propensos a la inestabilidad lateral. En este artículo se describe un caso de estudio real de inestabilidad lateral de una viga pretensada de puente de gran luz y se realiza un estudio paramétrico. Se analizan las actuales provisiones del Código Modelo 2010 y se muestra que pueden resultar inseguras en casos límites. Improvements in concrete prefabrication technology makes the use of long-span concrete girders more competitive compared to other alternatives. However, the weight of the element is determining factor in transportation and lifting operation costs, hence the width of the flanges tends to be reduced. This results in elements more prone to lateral instability. In this paper, a real case study of lateral instability of a long pre-cast girder is presented. A parametric analysis is carried out to determine the limits of application of the solution. The current provisions of the Model Code 2010 are analysed, and it is shown that they may be insufficient in some limit cases.

      PubDate: 2017-05-31T14:03:24Z
      DOI: 10.1016/j.hya.2017.04.012
       
  • A proposal of a beam-to-column joint using shear studs: FEM and
           experiments
    • Authors: Antonio Aznar López; José I. Hernando García; Jesús Ortiz Herrera; Jaime Cervera Bravo
      Abstract: Publication date: Available online 24 May 2017
      Source:Hormigón y Acero
      Author(s): Antonio Aznar López, José I. Hernando García, Jesús Ortiz Herrera, Jaime Cervera Bravo
      The main aim of this work is to propose an alternative beam-to-column joint for use in building structures. This novel solution consists of a group of headed studs, and has been conceived to connect reinforced concrete floors to steel columns. It is a primary structural joint and it can be used both in conventional concrete beams and in slabs. The alternative approach presented in this work offers significant benefits compared to conventional joints. Some of these advantages are regarding simplicity, industrialization possibilities, shear strength capacity, as well as the excellent weld safety due to the use of headed studs.

      PubDate: 2017-05-26T12:36:39Z
      DOI: 10.1016/j.hya.2017.05.001
       
  • El Elogio del horizonte de Chillida, un encuentro entre ciencia y arte
    • Authors: Deborah García Bello; Moisés Canle
      Abstract: Publication date: Available online 23 May 2017
      Source:Hormigón y Acero
      Author(s): Deborah García Bello, Moisés Canle
      A través de la investigación de los aspectos ingenieriles del Elogio del horizonte de Chillida tales como materiales, ejecución de la obra, localización, forma y escala, se pretende demostrar la inequívoca relación entre la ciencia y el arte. Se describen de forma divulgativa los procesos fisicoquímicos implicados en la dosificación, encofrado, fraguado, curado, etc. del hormigón empleado, así como la interpretación artística de esta elección. Se constata el vínculo entre formas de conocimiento, ya que la obra no podría haber sido ejecutada, pensada, ni interpretada, de no disponerse de conocimientos y herramientas propias de la ingeniería. By studying the engineering aspects of Chillida's ‘Elogio del horizonte’ (Praise of the Horizon), such as the materials, work execution, location, shape and scale, an attempt is made to show the unambiguous relationship between science and art. A description is presented on the physicochemical processes involved in the dosage, formwork, hardening, curing, etc. of the concrete, as well as the artistic interpretation of the author's choice. We show the link between different forms of knowledge, as the work could not be executed, nor be interpreted, without the necessary body of knowledge from engineering.

      PubDate: 2017-05-26T12:36:39Z
      DOI: 10.1016/j.hya.2017.04.002
       
  • Caracterización del comportamiento en flexión del hormigón reforzado
           con fibras sometido a impacto
    • Authors: Gonzalo Sanz-Díez de Ulzurrun Casals; Carlos Zanuy Sánchez
      Abstract: Publication date: Available online 16 May 2017
      Source:Hormigón y Acero
      Author(s): Gonzalo Sanz-Díez de Ulzurrun Casals, Carlos Zanuy Sánchez
      El hormigón reforzado con fibras metálicas (SFRC por sus siglas en inglés) ha mostrado su eficacia mejorando las propiedades del hormigón. Una aplicación interesante de dicho material es en las estructuras sometidas a impactos. Con el objetivo de caracterizar las propiedades dinámicas del SFRC se ha llevado a cabo una campaña experimental con una máquina de impactos instalada recientemente en el Laboratorio de Estructuras de la Universidad Politécnica de Madrid. Las probetas ensayadas, reforzadas con distintos tipos de fibras metálicas en diferentes dosificaciones, muestran que las mezclas de SFRC presentan mejores propiedades dinámicas y una sensibilidad a la velocidad de carga diferente que el hormigón convencional. Steel-fibre-reinforced concrete (SFRC) has demonstrated its effectiveness in improving concrete properties. An interesting application of this material may be for structures subject to impact loads. An experimental camping was conducted in order to determine the dynamic properties of SFRC, with a drop weight testing machine recently installed in the UPM Structures Laboratory. The tested specimens, reinforced with different types of steel fibres and fibre content, showed that SFRC mixes have improved mechanical properties and a strain-rate sensitivity different than that of plain concrete.

      PubDate: 2017-05-20T20:43:23Z
      DOI: 10.1016/j.hya.2017.04.003
       
  • Estudio de las propiedades mecánicas residuales de hormigones
           expuestos a altas temperaturas
    • Authors: Francisco B. Varona; Francisco J. Baeza; Salvador Ivorra
      Abstract: Publication date: Available online 16 May 2017
      Source:Hormigón y Acero
      Author(s): Francisco B. Varona, Francisco J. Baeza, Salvador Ivorra
      La versión actual del Eurocódigo 2 aporta datos tabulados para la evolución de las propiedades mecánicas de hormigones de resistencia convencional. Pero en el caso de hormigones de alta resistencia de áridos calizos se reconoce la falta de datos suficientes. Este trabajo presenta los resultados experimentales obtenidos en un hormigón convencional y otro de alta resistencia de áridos calizos sometidos a altas temperaturas. Los resultados presentaron buena correlación con antecedentes de investigación y se aportan ecuaciones para describir la evolución de algunas propiedades mecánicas de los hormigones de resistencia convencional y de alta resistencia. The current version of the European standard for concrete structures gives tabulated data for the evolution of the mechanical properties of normal strength concrete. However, the standard acknowledges the lack of sufficient data for the case of high strength concrete with limestone aggregate. This paper presents the experimental results obtained on two batches of normal and high strength concrete subjected to high temperatures. Those results gave a good correlation with previous studies and equations are provided to describe the evolution of some mechanical properties of both normal and high strength concretes at elevated temperatures.

      PubDate: 2017-05-20T20:43:23Z
      DOI: 10.1016/j.hya.2017.04.004
       
  • Viaducto de Ripollet, para el carril Bus-Vao, en la autopista C-58
           (Barcelona)
    • Authors: José Antonio Llombart Jaques
      Abstract: Publication date: Available online 15 May 2017
      Source:Hormigón y Acero
      Author(s): José Antonio Llombart Jaques
      El viaducto, recientemente construido para el carril Bus-Vao en la autopista C-58, está constituido por una estructura elevada cuyas pilas se sitúan en el espacio comprendido entre los dos tableros de un viaducto existente. El tablero del nuevo viaducto está formado por una estructura metálica espacial de tubos, que soporta una plataforma de hormigón, sobre la que discurre la calzada. El sistema constructivo desarrollado, inédito para este tipo de estructura, ha consistido en el montaje del 100% de pilas y tablero sin contar con el apoyo de elementos de obra sobre los tableros del viaducto existente, que tan solo han sido utilizados ocasionalmente para labores auxiliares de ayuda, control e inspección, de tal forma que en ningún momento se ha precisado cortar el tráfico de vehículos. Recently built for the Bus-HOV lane on the C-58 Motorway, the Viaduct consists of an elevated structure in which the piers are located in the space between the two decks of an existing viaduct. The new deck consists of a spatial steel tube structure which supports a concrete platform, on which the carriageway runs. Unknown for this type of structure, the construction system developed consisted in erecting 100% of the piers and deck without the support of the existing viaduct's decks which were only occasionally used for auxiliary aid jobs, control, and inspection, whilst traffic did not have to be cut off at any time.

      PubDate: 2017-05-16T15:31:50Z
      DOI: 10.1016/j.hya.2017.04.005
       
  • Introducción
    • Authors: Carlos Pozo; Moya
      Abstract: Publication date: January–April 2017
      Source:Hormigón y Acero, Volume 68, Issue 281
      Author(s): Carlos Pozo Moya


      PubDate: 2017-05-11T15:31:48Z
       
  • Criterios de diseño sísmico en viaductos de alta velocidad en la
           zona de Levante
    • Authors: Jorge Cascales Fernández; Ricardo Rico Rubio; Sergio Couto Wörner
      Abstract: Publication date: Available online 23 March 2017
      Source:Hormigón y Acero
      Author(s): Jorge Cascales Fernández, Ricardo Rico Rubio, Sergio Couto Wörner
      Se exponen en este artículo los criterios de diseño seguidos para dimensionar las estructuras de tres tramos diferentes de la línea de alta velocidad de Levante. Estos tramos se sitúan en una de las zonas de España con mayor riesgo sísmico, con aceleraciones de cálculo de hasta 0,29g. No se ha encontrado una solución única válida para todas las estructuras, sino que para cada una de ellas se ha estudiado la mejor alternativa posible valorando tanto los esfuerzos sísmicos actuantes, como las labores de mantenimiento y conservación. En particular, se muestran en el presente artículo soluciones convencionales de vinculación rígida tablero-subestructura, viaductos con dispositivos antisísmicos (amortiguadores y apoyos pendulares) y estructuras dimensionadas con criterio de ductilidad limitada. In this article the seismic design criteria that was taken into account to design different high speed railway bridges in the Spanish Levante region is discussed. This is one of the areas with more seismic activity in Spain with a peak ground acceleration of 0.29g. No unique solution has been found for all the structures. Each bridge has been studied individually to find the most suitable alternative taking into account seismic forces, maintenance and conservation works. In this article conventional solutions with rigid joints between deck and substructure, bridges with antiseismic devices (dampers and pendulum bearings) and structures with limited ductile behaviour are shown.

      PubDate: 2017-03-26T01:02:01Z
      DOI: 10.1016/j.hya.2017.02.001
       
  • Recimentación y hundimiento inducido de un edificio industrial mediante
           uso de pilotes de control y extracción de material
    • Authors: Bernardo Orozco Rivas; Mabel Mendoza Pérez
      Abstract: Publication date: Available online 28 January 2017
      Source:Hormigón y Acero
      Author(s): Bernardo Orozco Rivas, Mabel Mendoza Pérez
      Se presenta el caso de la reparación y hundimiento inducido de la cimentación de un edificio industrial de acero, cuya cimentación consiste en zapatas aisladas y pilotes de fricción, ubicado en una zona sísmica y de grandes hundimientos en México. El procedimiento de reparación consistió en la construcción de una celda de hormigón armado para convertir los pilotes de fricción a pilotes de control y además permitir la extracción de material por debajo de la cimentación, logrando que el edificio siga el hundimiento regional. Mediante este proceso el edificio asentó 0,27m. Durante los trabajos ocurrieron 2 sismos de magnitudes 6,6 y 5,4, respectivamente, y en ninguno de ellos se detectó daño o mal funcionamiento del sistema, manteniendo en todo momento la seguridad del personal, de la estructura y el tránsito de vehículos. The case of repair and induced subsidence of the foundation of an industrial building, whose foundation consists of isolated footings and friction piles, is presented; located in a seismic zone and of great subsidence in Mexico. The repair procedure consisted in the construction of a reinforced concrete cell to convert the friction piles to control piles and also to allow the extraction of material underneath the foundation, making the building follow the regional subsidence. Through this process the building settled 0.27m. During the work, two earthquakes of magnitude 6.6 and 5.4 occurred, in none of them was detected damage or malfunction of the system, maintaining at all times the safety of workers, the structure and the traffic of vehicles.

      PubDate: 2017-01-30T21:02:10Z
      DOI: 10.1016/j.hya.2016.12.001
       
  • Distintos sistemas de aislamiento empleados en puentes
    • Authors: Leonardo Fernández Troyano; Guillermo Ayuso Calle; Lucía Fernández Muñoz
      Abstract: Publication date: Available online 4 January 2017
      Source:Hormigón y Acero
      Author(s): Leonardo Fernández Troyano, Guillermo Ayuso Calle, Lucía Fernández Muñoz
      En Carlos Fernández Casado, S.L. Oficina de Proyectos se han diseñado y construido en los últimos 40 años muchos puentes en zonas sísmicas como México, Colombia y Chile. En estos puentes se han dispuesto diferentes sistemas de aislamiento frente a la acción sísmica, eligiendo el sistema que parecía más adecuado para cada uno de ellos. Cabe indicar que no existe una solución única para resistir la acción sísmica, pudiendo disponer en cada puente un sistema diferente y que sea igualmente válido. In the company Carlos Fernández Casado, S.L. Oficina de Proyectos have been designed and built many bridges in seismic areas such as Mexico, Colombia and Chile in the last 40 years. In these bridges have been arranged different isolation systems against seismic action, choosing the system that seemed best suited for each of them. It is noted that there is no single solution to resist the seismic action, each bridge may have a different system and that is equally valid.

      PubDate: 2017-01-06T09:12:15Z
      DOI: 10.1016/j.hya.2016.09.003
       
 
 
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