Seismic risk analysis for inter-story isolation structure collapse under main aftershock sequence
LIU Jieya1, HUANG Xiaoning1, 2, HE Ting1, WANG Ning1, DU Yongfeng3
1. School of Civil Engineering, Qinghai University, Xining 810016, China;
2. Institute of Advanced Engineering Structures, Zhejiang University, Hangzhou 310058, China;
3. Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China
Abstract:In order to quantitatively evaluate the damage of isolation structure caused by the aftershock, a method for constructing main shock-aftershock sequence suitable for the isolation structure was presented, which considered the randomness of seismic wave and the complexity of the structure. Then, seismic waves were selected as the excitation based on constructing method of this paper, carried out seismic risk analysis for the inter-story isolation structure subjected to the main shock-aftershock sequences, which employed damage index as structure seismic demand parameter and spectral acceleration as ground motion intensity parameter. The result indicate that structural damage index is increased obviously with the action of aftershock and the decrease of the exceeding probability, comparing with the exceeding probability of the single main shock is 2% in 50 years, after an exceeding probability of the aftershock is 2% in 50 years, the damage state of inter-story isolation structure from minor to moderate, the damage of the target structure is increased by 23.26%, the damage of the isolation layer is increased by 33.33%, and probability of the structure collapse risk is increased by 75%, which illustrate that the aftershock will lead to the aggravation of structural damage and increase the possibility of collapse.
刘洁亚1,黄小宁1,2,何婷1,王宁1,杜永峰3. 主余震序列作用下层间隔震结构倒塌地震风险分析[J]. 振动与冲击, 2023, 42(19): 194-203.
LIU Jieya1, HUANG Xiaoning1, 2, HE Ting1, WANG Ning1, DU Yongfeng3. Seismic risk analysis for inter-story isolation structure collapse under main aftershock sequence. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(19): 194-203.
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