Abstract
One of the efficient tools in evaluating the seismic collapse in structures is to establish their fragility curves. In this study, an attempt has been made to evaluate the fragility curve in steel and concrete structures undergoing progressive seismic collapse. Tensile strength of concrete and steel was equal to 4 MPa and 109 MPa, respectively. The nonlinear dynamic analysis and the alternate path method have been carried out on the four types of buildings with 5, 10, 15 and 20 stories using SAP2000 computer code. By evaluating incremental dynamic analysis curves, it was observed that the greater number of stories results in the structure’s collapse at lower load factors. This issue is of significance because if this progressive damage is not considered in designing structures with combined columns, collapse of the structure is not adequately considered. For example, life safety (LS) performance is obtained in structures designed with an IO (immediate occupancy) performance level. In addition, based on these curves, the progressive damage occurs at higher levels; the structure will collapse under a greater loading factor and will endure greater force, which also indicates the significance of the story undergoing progressive damage.
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Haeri, H., Maleki, M., Shahvali, H. et al. Evaluating the Fragility Curve in Steel–Concrete Structure Undergoing Seismic Progressive Collapse by Finite Element Method. Iran J Sci Technol Trans Civ Eng 46, 2275–2288 (2022). https://doi.org/10.1007/s40996-021-00764-y
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DOI: https://doi.org/10.1007/s40996-021-00764-y