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Evaluation of Non-linear Modeling Parameters for Diagonally Reinforced Coupling Beam
Performance Based Design (PBD) using nonlinear analysis techniques is a well– established method to evaluate the seismic performance of RC coupled wall structural systems and their associated components like coupling beams. In principle, it is crucial to precisely define component behavior (Force–Deformation relation) for an exact evaluation of the global performance of the system. However, it is noticed that at present extensive information is not available for this purpose. ASCE 41 provides nonlinear modeling parameters and numerical acceptance criteria for components but this information is inadequate specifically for Diagonally Reinforced Coupling (DRC) beams. Moreover, vital effects of many key factors are not taken into account in ASCE 41 recommendations for Force–Deformation behavior of the DRC beam. In view of above, this study was intended to evaluate the impact of various key factors on nonlinear behavior of DRC beam at first and eventually to estimate nonlinear modeling parameters with practical considerations of the vital effects of these key factors. Specifically, these key factors were aspect ratio, shear stress levels, confinement, and compressive strength of concrete. The definitive goal of the study was to advocate a reasonable framework for ASCE 41 to incorporate the key factors in the recommendations for DRC beam. However, this study does not warrant the accuracy, content, completeness or suitability of the information provided in the proposed framework.
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