Research on dynamic response analysis and evaluation method of resistance to progressive collapse of reinforced concrete frame structures at high temperatures

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 298-307.

LI Zhi1,2,HUANG Xinhui2,JI Fuquan3,ZHONG Yu3,DENG Xiaofang*1,2

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Abstract

To investigate the collapse performance of reinforced concrete (RC) frame structures under high temperatures, this paper utilizes ABAQUS finite element software to establish a finite element model for a two-story RC frame structure with instantaneous corner column removal. Based on the full validation of the model's accuracy, the study examines the impact of different durations and areas of fire exposure on the dynamic response of the RC frame structure to progressive collapse following corner column failure, through sequential thermo-mechanical coupling modeling. Furthermore, considering the uncertainty of parameters, a probabilistic assessment of the resistance to progressive collapse of RC frame structures under high temperatures is conducted. The results show that with the increase of fire time, when the first layer corner lattice is exposed to fire, the maximum peak displacement of the structure without columns increases by 153.26% compared with that at room temperature, and its resistance mechanism is mainly cantilever action and vierendeel effect, and the tensile membrane effect occurs when 60min is exposed to fire. When the first and second floor corner grids are exposed to fire, the maximum peak displacement of the structure after column removal is increased by 145.81%. Compared with the first layer corner lattice exposed to fire, the vierendeel effect is weakened, but when exposed to fire 60min, the floor produces a more obvious tensile membrane effect to resist collapse. Based on the uncertainty of structure and load, the cumulative distribution function obtained by fitting can better evaluate the collapse probability of RC frame structure at high temperature.

Key words

reinforced concrete structures / corner column removal scenario / dynamic response / high temperature / progressive collapse

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LI Zhi1, 2, HUANG Xinhui2, JI Fuquan3, ZHONG Yu3, DENG Xiaofang1, 2. Research on dynamic response analysis and evaluation method of resistance to progressive collapse of reinforced concrete frame structures at high temperatures[J]. Journal of Vibration and Shock, 2025, 44(12): 298-307

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