Progressive Collapse Assessment of a Seismically Designed RC Moment-resisting Building according to the Iranian Design Codes

Progressive Collapse is considered as a chain effect following a small portion failure and at last results in a disproportional collapse of building. In last decades many researches have been conducted on different structural systems concerning progressive collapse. This study mainly focuses on progressive collapse assessment of a RC moment-resisting frame which is designed according to the Iranian building codes. The seven storied building with moderate ductility detailing is located in Tehran which is high seismicity zone due to Iranian building code (2800 code). To investigate progressive collapse potential, several non-linear dynamic procedures (NDP) with preceded column removal scenarios due to GSA2013 are carried out and the ability of model to successfully absorb member loss with alternate load path is assessed. Moreover for further investigation, nonlinear static analysis is conducted to compare the analysis outcomes. Results demonstrate progressive collapse is triggered at the beams of higher stories but for the considered column removal approaches, the vertical displacement time history responses of joints above removed columns continue to converge and reach a stable state. According to the conventional seismic loading and design methods, in moment resisting frames, columns and beams of upper stories are mainly weaker than lowers, and therefore tends to be more vulnerable to instantaneous column loss which must be taken into account for progressive collapse design

کلیدواژه ها:

Progressive Collapse ، RC Building ، non-linear dynamic assessment