The Experts below are selected from a list of 345 Experts worldwide ranked by ideXlab platform
Max A N Hendriks - One of the best experts on this subject based on the ideXlab platform.
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a critical evaluation of topology optimization results for strut and tie modeling of reinforced Concrete
Computer-aided Civil and Infrastructure Engineering, 2020Co-Authors: Yi Xia, Matthijs Langelaar, Max A N HendriksAbstract:Defining a suitable truss model is one of the most important steps of applying the strut-and-tie modeling (STM) method to design D-regions in reinforced Concrete (RC) structures. The truss model is a discrete representation of the stress field developed within a region of a Concrete Element. Topology optimization (TO) methods have been investigated by researchers for about two decades to generate suitable models for the STM method. Several truss models and numerous continuum TO results that could serve as an inspiration for suitable truss models have been proposed. However, limited attention has been paid to the evaluation of various TO results in the perspective of the STM method. As a result, it is at present unclear to what extent TO results offer a benefit for STM modeling, and which method should be preferred. In order to address this gap, an automatic and objective evaluation procedure is proposed in this paper. First, a TO result extraction method is proposed to systematically convert optimized topologies to truss-like structures. Next, based on the extracted structures, three evaluation measures are formulated to evaluate TO results. These measures indicate whether an analyzable truss model could be extracted, to which extent tensile stress regions are covered by tensile ties and how economical the design will be. The effectiveness of the proposed evaluation procedure is validated using known STM solutions. Subsequently, the evaluation procedure is applied to 23 TO results from the literature, covering three different design problems. Most TO results show a good performance in covering tensile regions and would result in economical designs, and some undesired topologies are also identified by the evaluation method. Nevertheless, the use of continuum TO is most hampered by difficulties in identifying a suitable truss from the TO results.
Constantin E Chalioris - One of the best experts on this subject based on the ideXlab platform.
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analytical approach for the evaluation of minimum fibre factor required for steel fibrous Concrete beams under combined shear and flexure
Construction and Building Materials, 2013Co-Authors: Constantin E ChaliorisAbstract:Abstract The use of steel fibres as shear resistance mass reinforcement has been well-documented and the possibility of partially or even fully replacing of stirrups with steel fibres has been examined. However, issues of common engineering practice about the optimum content of steel fibres in shear-dominated fibrous Concrete beams have not yet been fully clarified. This study presents an analytical approach to the aforementioned question. The proposed methodology is initially based on the calculations of the flexural and shear capacities of a steel fibrous Concrete Element and to the concept that a pure flexural response should be achieved. The target of this method is to evaluate the minimum fibre factor, F , required in order that a fibrous Concrete beam to satisfy pre-set strength and ductility requirements. The well-known fibre factor expresses the effect of both the volume fraction and the geometrical characteristics of the used steel fibres and its calculation is achieved by a concluding cubic formula derived from the proposed procedure. Steel fibres can be used either as the only shear reinforcement or in combination with a minimum or a desirable amount of stirrups. A database of 256 tested beams collected from 17 existing works around the world is used to establish the validity of the proposed approach. Comparisons between experimental data and predicted results derived from the analytical procedure showed a very good agreement. Two numerical examples of a typical shear-critical beam and a rather short edge-loaded cantilever slab that illustrate the application of the described method are also presented herein. Further, analytical curves and design charts have been plotted by the implementation of the proposed approach as an analysis tool for parametrical study. The influence of the Concrete strength, the span-to-depth ratio, the tension steel longitudinal reinforcement and the amount of the provided stirrups on the value of the fibre factor has also been investigated and discussed.
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experimental validation of smeared analysis for plain Concrete in torsion
Journal of Structural Engineering-asce, 2000Co-Authors: Chris G Karayannis, Constantin E ChaliorisAbstract:This is the second of two papers concerned with the development and the application of a smeared crack model for the description of the behavior of Concrete Elements in torsion. The first paper presented the development of an efficient model for the torsional analysis of Concrete that utilizes a special numerical technique, which is properly adapted to include the smeared crack approach. This paper presents the validation of the analytical model by providing comparisons between analytically predicted behavior curves and experimentally obtained ones. The experimental data used in this paper comprise a series of tests in pure torsion conducted for this purpose and a database of experimental information compiled from works around the world, in an attempt to establish the validity of the proposed approach based on a broad range of parametric studies. From the comparisons between the predicted and the measured data, it is concluded that the proposed approach describes very well the behavior of Concrete Element...
Shweta Goyal - One of the best experts on this subject based on the ideXlab platform.
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acoustic emission vis a vis electrochemical techniques for corrosion monitoring of reinforced Concrete Element
Construction and Building Materials, 2014Co-Authors: Shilpa Patil, Bilavari Karkare, Shweta GoyalAbstract:Abstract Corrosion of steel reinforcement and subsequent cracking of Concrete is a major cause for deterioration of reinforced Concrete (RC) structures. For safety of structures early detection of deterioration by means of non-destructive testing is the need of the day. Comparative study of acoustic emission (AE) and electrochemical techniques for an experimental investigation of corrosion of steel embedded in Concrete is presented here. The results show two stages of corrosion process and also indicate that, cumulative signal strength can be used as a promising parameter of AE technique to monitor progress of damage in RC due to corrosion.
Yi Xia - One of the best experts on this subject based on the ideXlab platform.
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a critical evaluation of topology optimization results for strut and tie modeling of reinforced Concrete
Computer-aided Civil and Infrastructure Engineering, 2020Co-Authors: Yi Xia, Matthijs Langelaar, Max A N HendriksAbstract:Defining a suitable truss model is one of the most important steps of applying the strut-and-tie modeling (STM) method to design D-regions in reinforced Concrete (RC) structures. The truss model is a discrete representation of the stress field developed within a region of a Concrete Element. Topology optimization (TO) methods have been investigated by researchers for about two decades to generate suitable models for the STM method. Several truss models and numerous continuum TO results that could serve as an inspiration for suitable truss models have been proposed. However, limited attention has been paid to the evaluation of various TO results in the perspective of the STM method. As a result, it is at present unclear to what extent TO results offer a benefit for STM modeling, and which method should be preferred. In order to address this gap, an automatic and objective evaluation procedure is proposed in this paper. First, a TO result extraction method is proposed to systematically convert optimized topologies to truss-like structures. Next, based on the extracted structures, three evaluation measures are formulated to evaluate TO results. These measures indicate whether an analyzable truss model could be extracted, to which extent tensile stress regions are covered by tensile ties and how economical the design will be. The effectiveness of the proposed evaluation procedure is validated using known STM solutions. Subsequently, the evaluation procedure is applied to 23 TO results from the literature, covering three different design problems. Most TO results show a good performance in covering tensile regions and would result in economical designs, and some undesired topologies are also identified by the evaluation method. Nevertheless, the use of continuum TO is most hampered by difficulties in identifying a suitable truss from the TO results.
Shilpa Patil - One of the best experts on this subject based on the ideXlab platform.
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acoustic emission vis a vis electrochemical techniques for corrosion monitoring of reinforced Concrete Element
Construction and Building Materials, 2014Co-Authors: Shilpa Patil, Bilavari Karkare, Shweta GoyalAbstract:Abstract Corrosion of steel reinforcement and subsequent cracking of Concrete is a major cause for deterioration of reinforced Concrete (RC) structures. For safety of structures early detection of deterioration by means of non-destructive testing is the need of the day. Comparative study of acoustic emission (AE) and electrochemical techniques for an experimental investigation of corrosion of steel embedded in Concrete is presented here. The results show two stages of corrosion process and also indicate that, cumulative signal strength can be used as a promising parameter of AE technique to monitor progress of damage in RC due to corrosion.