The purpose of this research was to propose an extension of the displacement-based approach for the assessment of the seismic response of infilled RC frames. In order to evaluate the behaviour of these structures, it was fundamental to define an appropriate analytical model. In this study the equivalent strut model for monotonic loading proposed by Al-Chaar was considered. This model was extended to the case of cyclic loading by calibrating the degradation of strength and stiffness, the residual strength and the loading and unloading branches through comparisons with available experimental results. The model was then applied for investigating the seismic response of infilled RC frames: pushover and nonlinear dynamic analyses were carried out for obtaining the response in terms of base shear-top displacement and for estimating the configuration of collapse. On the basis of the results of these analyses, a displacement-based method for the assessment of infilled frames was proposed. The method is based in particular on simplified criteria for the estimate of the equivalent damping and of the collapse displacement profile of infilled RC frames. The effectiveness of the method was verified through comparison between the displacement demand estimated with the proposed procedure and the one obtained from nonlinear dynamic analyses.

Application of displacement-based procedures for the assessment of infilled RC frames

LANDI, LUCA;TARDINI, ANNALISA;DIOTALLEVI, PIER PAOLO
2014

Abstract

The purpose of this research was to propose an extension of the displacement-based approach for the assessment of the seismic response of infilled RC frames. In order to evaluate the behaviour of these structures, it was fundamental to define an appropriate analytical model. In this study the equivalent strut model for monotonic loading proposed by Al-Chaar was considered. This model was extended to the case of cyclic loading by calibrating the degradation of strength and stiffness, the residual strength and the loading and unloading branches through comparisons with available experimental results. The model was then applied for investigating the seismic response of infilled RC frames: pushover and nonlinear dynamic analyses were carried out for obtaining the response in terms of base shear-top displacement and for estimating the configuration of collapse. On the basis of the results of these analyses, a displacement-based method for the assessment of infilled frames was proposed. The method is based in particular on simplified criteria for the estimate of the equivalent damping and of the collapse displacement profile of infilled RC frames. The effectiveness of the method was verified through comparison between the displacement demand estimated with the proposed procedure and the one obtained from nonlinear dynamic analyses.
Proceedings of the Second European Conference on Earthquake Engineering and Seismology
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10
Landi, Luca; Tardini, Annalisa; Diotallevi, Pier Paolo
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/552488
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