The Experts below are selected from a list of 267 Experts worldwide ranked by ideXlab platform

Michael D. Kotsovos - One of the best experts on this subject based on the ideXlab platform.

  • Conflicts between Reinforced Concrete Design assumptions and actual Concrete behaviour
    Proceedings of the Institution of Civil Engineers - Structures and Buildings, 2020
    Co-Authors: Michael D. Kotsovos
    Abstract:

    Reinforced Concrete (RC) Design is in a state of perpetual revision of ever-increasing complexity. However, preventing the recurrence of unexpected types of brittle failure is yet to be achieved. I...

  • Reappraisal of Concepts Underlying Reinforced-Concrete Design
    Compressive Force-Path Method, 2013
    Co-Authors: Michael D. Kotsovos
    Abstract:

    Since the mid-eighties, there has been an increasing amount of experimental evidence which shows that many of the concepts underlying current-code provisions for the Design of Reinforced-Concrete (RC) structures are in conflict with fundamental properties of Concrete at both the material and the structure levels.

  • Concepts Underlying Reinforced Concrete Design: Time for Reappraisal
    Aci Structural Journal, 2007
    Co-Authors: Michael D. Kotsovos
    Abstract:

    Experimental evidence over the past 20 years has demonstrated that the underlying concepts of the provisions of some current codes of practice for the shear and flexural Design of Reinforced Concrete structures conflict with fundamental properties of structural Concrete at both the material and the structure levels. This study seeks to collate and present in a unified manner all available research on the conflict between the concepts underlying current code provisions and the causes of the observed and/or measured structural behavior. Findings show that this conflict is the cause of various types of unexpected premature brittle failure of Reinforced Concrete structures. Triaxial stress conditions that invariably develop in Concrete at the ultimate-limit state of an Reinforced Concrete structure or element are not taken account by the methods adopted by current codes. Experimental evidence is presented that indicates the aforementioned types of failure can be prevented by adopting alternative Design methods that allow for a more realistic description of structural Concrete behavior.

Rodrigo Helou - One of the best experts on this subject based on the ideXlab platform.

  • CAD/CAE in a Complex Structural Reinforced Concrete Design: Case Study of a Cathedral
    Computing in Civil Engineering (2012), 2012
    Co-Authors: C.A. Issa, Rodrigo Helou
    Abstract:

    The main issues that significantly contribute to problems and delays on construction sites are changing client's requirements, incomplete Design information, and poor site monitoring and control. Although experienced Designers and construction managers control or minimize such problems during the Design stage, the complexity and amount of the information in construction project make such a task very difficult to accomplish effectively. This paper presents an actual case study model for an integrated system which aims at presenting CAD/CAE in 3D using virtual reality. Firstly, the technology enables the Designer to walk-through the proposed building perhaps at different construction time intervals-giving a vivid appreciation of the whole situation. Secondly, its enables the users to interrogate the building structural elements to present its details progress thus giving total virtual structural view of the project. Thirdly, the Design effect of any changes in the building configuration can be modeled, visualized, and even the cost effect could be calculated. Finally the system enables virtual models to be shared and thus facilitates collaborative global Design and construction. A case study involving the Design of a 1600 m2 Cathedral with a roof height of 13m and a span of 33m is explored.

  • CAD/CAE in a complex structural Reinforced Concrete Design: Case study of a cathedral
    Congress on Computing in Civil Engineering, Proceedings, 2012
    Co-Authors: C.A. Issa, Rodrigo Helou
    Abstract:

    The main issues that significantly contribute to problems and delays on construction sites are changing client's requirements, incomplete Design information, and poor site monitoring and control. Although experienced Designers and construction managers control or minimize such problems during the Design stage, the complexity and amount of the information in construction project make such a task very difficult to accomplish effectively. This paper presents an actual case study model for an integrated system which aims at presenting CAD/CAE in 3D using virtual reality. Firstly, the technology enables the Designer to walk-through the proposed building perhaps at different construction time intervals-giving a vivid appreciation of the whole situation. Secondly, its enables the users to interrogate the building structural elements to present its details progress thus giving total virtual structural view of the project. Thirdly, the Design effect of any changes in the building configuration can be modeled, visualized, and even the cost effect could be calculated. Finally the system enables virtual models to be shared and thus facilitates collaborative global Design and construction. A case study involving the Design of a 1600 m2 Cathedral with a roof height of 13m and a span of 33m is explored. © 2012 American Society of Civil Engineers.

Fahed Abdullah S. Alrshoudi - One of the best experts on this subject based on the ideXlab platform.

  • Textile Reinforced Concrete: Design Methodology and Novel Reinforcement
    2015
    Co-Authors: Fahed Abdullah S. Alrshoudi
    Abstract:

    Fibre reinforcement has been used to reinforce Concrete members for decades. It has combined well with Concrete to help control cracking and increase toughness and other properties such as corrosion resistance. The use of traditional fibre reinforcement has led to the development of a new material called textile reinforcement (multifilament continuous fibre) which can also be used as the main reinforcement instead of steel reinforcement. This study experimentally investigates Concrete beams Reinforced only with carbon textile material (TRC beams). The tensile strength of textile reinforcement and pull out strength of TRC were measured. Four-point bending tests were performed on 76 beams (small and large scale beams). Several parameters such as volume fraction and reinforcement layout were studied in order to investigate their effect on TRC beam behaviour. The results showed that with the correct layout and geometry of textile reinforcement, these Reinforced Concrete beams, providing they had sufficient cover thickness, would perform well. Also, the results confirmed that the bond between the Concrete and textile reinforcement plays a vital role in TRC beam performance. The behaviour of the TRC beams was compared with that of the steel Reinforced Concrete (SRC) beams; a major advantage of the TRC beam was the reduced crack widths. This study finishes by proposing a Design methodology for TRC beams. Guidance covers flexural Design, predictions for moment-curvature, and predictions for crack width of TRC beams.

Gebrail Bekdaş - One of the best experts on this subject based on the ideXlab platform.

  • Optimum Design of Reinforced Concrete Retaining Walls
    Advances in Computational Intelligence and Robotics, 2018
    Co-Authors: Rasim Temür, Gebrail Bekdaş
    Abstract:

    Methodologies based on metaheuristic algorithms such as particle swarm optimization, harmony search algorithm, and teaching-learning-based optimization are proposed for optimum Design of Reinforced Concrete cantilever retaining walls. The objective function of optimization is to find a Design providing minimum cost, including material and construction costs. For this purpose, the best combination of 11 Design variables (heel and toe projections, stem thickness at the top and bottom of a wall, slab thickness and rebar diameters, and spacing between the bars) that satisfy 29 Design constraints including stability (overturning, sliding, and bearing) and Reinforced Concrete Design of the wall are searched during the optimization process. The rules of ACI 318 14 (building code requirements for structural Concrete) are used for the Reinforced Concrete Design. In order to determine the strengths and weaknesses of algorithms, several different cases are investigated. As conclusions, some suggestions have been obtained that will lead to future work in this field.

  • Optimum Reinforced Concrete Design by Harmony Search Algorithm
    Metaheuristics and Optimization in Civil Engineering, 2015
    Co-Authors: Gebrail Bekdaş, Sinan Melih Nigdeli, Xin-she Yang
    Abstract:

    The music-inspired metaheuristic method, called harmony search (HS), is an effective tool in optimization of engineering Design problems. HS has been applied for the optimum Design of Reinforced Concrete (RC) members so as to find the best solution, balancing the usability of the Design and economy. In this chapter, the optimum Design of RC members is presented after optimization of RC members. Then, HS-based optimization applications, such as RC slender columns, RC shear walls, and post-tensioned RC axially symmetric cylindrical walls, are also discussed. The HS-based methods are feasible in finding the optimum Design in such problems.

C.A. Issa - One of the best experts on this subject based on the ideXlab platform.

  • CAD/CAE in a Complex Structural Reinforced Concrete Design: Case Study of a Cathedral
    Computing in Civil Engineering (2012), 2012
    Co-Authors: C.A. Issa, Rodrigo Helou
    Abstract:

    The main issues that significantly contribute to problems and delays on construction sites are changing client's requirements, incomplete Design information, and poor site monitoring and control. Although experienced Designers and construction managers control or minimize such problems during the Design stage, the complexity and amount of the information in construction project make such a task very difficult to accomplish effectively. This paper presents an actual case study model for an integrated system which aims at presenting CAD/CAE in 3D using virtual reality. Firstly, the technology enables the Designer to walk-through the proposed building perhaps at different construction time intervals-giving a vivid appreciation of the whole situation. Secondly, its enables the users to interrogate the building structural elements to present its details progress thus giving total virtual structural view of the project. Thirdly, the Design effect of any changes in the building configuration can be modeled, visualized, and even the cost effect could be calculated. Finally the system enables virtual models to be shared and thus facilitates collaborative global Design and construction. A case study involving the Design of a 1600 m2 Cathedral with a roof height of 13m and a span of 33m is explored.

  • CAD/CAE in a complex structural Reinforced Concrete Design: Case study of a cathedral
    Congress on Computing in Civil Engineering, Proceedings, 2012
    Co-Authors: C.A. Issa, Rodrigo Helou
    Abstract:

    The main issues that significantly contribute to problems and delays on construction sites are changing client's requirements, incomplete Design information, and poor site monitoring and control. Although experienced Designers and construction managers control or minimize such problems during the Design stage, the complexity and amount of the information in construction project make such a task very difficult to accomplish effectively. This paper presents an actual case study model for an integrated system which aims at presenting CAD/CAE in 3D using virtual reality. Firstly, the technology enables the Designer to walk-through the proposed building perhaps at different construction time intervals-giving a vivid appreciation of the whole situation. Secondly, its enables the users to interrogate the building structural elements to present its details progress thus giving total virtual structural view of the project. Thirdly, the Design effect of any changes in the building configuration can be modeled, visualized, and even the cost effect could be calculated. Finally the system enables virtual models to be shared and thus facilitates collaborative global Design and construction. A case study involving the Design of a 1600 m2 Cathedral with a roof height of 13m and a span of 33m is explored. © 2012 American Society of Civil Engineers.