主余震序列作用下层间隔震结构倒塌地震风险分析

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振动与冲击 ›› 2023, Vol. 42 ›› Issue (19) : 194-203.

论文

刘洁亚1，黄小宁1,2，何婷1，王宁1，杜永峰3

作者信息 +

Seismic risk analysis for inter-story isolation structure collapse under main aftershock sequence

LIU Jieya1, HUANG Xiaoning1, 2, HE Ting1, WANG Ning1, DU Yongfeng3

Author information +

文章历史 +

摘要

为了定量评估余震对隔震结构造成的损伤，基于地震波的随机性和结构的复杂性，本文提出一种适用于隔震结构的主余震序列构造方法。其次，利用本文构造方法挑选的地震波作为激励，采用损伤指数作为结构地震需求参数，谱加速度作为地震动强度参数，对层间隔震结构进行主余震序列作用地震风险分析。研究结果表明：随着余震的作用和地震发生超越概率的降低，结构损伤指数会明显增加，与50年超越概率为2%的单独主震作用相比，在50年超越概率为2%的余震发生后，层间隔震结构从处于轻微破坏状态进入中等破坏状态，余震的作用使目标结构的损伤增大23.26%，隔震层的损伤增大33.33%，结构发生倒塌的风险概率增加75%，说明余震的作用会导致结构损伤加剧，发生倒塌的可能性增加。

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.

导出引用

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[J]. Journal of Vibration and Shock, 2023, 42(19): 194-203

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