考虑多次余震作用的地下结构抗震性能研究

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摘要一次强地震过后通常伴有多次余震发生，结构在历次地震中的损伤累计会降低其面临再一次强震作用时的安全储备。针对地下结构抗震设计与性能提升不考虑多次余震影响的现实情况，以1995年日本阪神地震中的大开地铁站为原型，选取含有多次余震的真实主余震记录，对比研究了多次余震作用、地震单独作用以及仅考虑最大峰值加速度（PGA）余震与主震构成主余震序列等3种不同工况下的结构地震响应特征。结果表明：余震作用对地下结构造成的地震损伤通常要比仅考虑单次地震激励时严重，余震强度较小时该现象不明显；在多次余震作用下，结构的峰值位移大于或等于相应单独地震的激励结果，但小于各单独地震的累计值；中柱的残余变形随余震次数的增多呈现出一定增大趋势，这将不利于结构的震后修复工作。

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	王建宁1
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	张广宇4
	徐建2
	潘鹏1
	庄海洋4

关键词 ：地下结构, 多次余震, 主余震, 抗震性能, 地震损伤

Abstract：Multiple aftershocks generally occur following a significant earthquake in a short time. When faced with aftershocks, the seismic safety reserve of underground structures will be reduced due to the accumulation of previous earthquake damages. At present, the influence of multiple aftershocks is ignored in the seismic design and performance improvement of underground structures. In this paper, the Daikai subway station during the 1995 Osaka-Kobe Earthquake was taken as the prototype and a nonlinear numerical model of soil-underground structure interaction was established based on Abaqus software. Real seismic records containing multiple aftershocks were selected and used to compare the seismic response characteristics of underground structures subjected to different earthquakes, including multiple aftershocks, single earthquake case and main shock-aftershock sequence. The results show that the seismic damage to underground structure caused by aftershocks is more serious than that caused by single earthquake excitation, and this result is not obvious when the aftershock intensity is small. The peak displacement of structures for the action of multiple aftershocks is equal or higher than that for the corresponding single earthquakes, but less than the cumulative value of a single earthquake. Moreover, the residual displacement of the middle column increases with the number of aftershocks, which is not conducive to post-earthquake structural repair.

Key words： underground structure multiple aftershocks mainshock-aftershock seismic performance earthquake damage

收稿日期: 2022-01-07 出版日期: 2023-09-15

引用本文:

王建宁1，2，3，张广宇4，徐建2，潘鹏1，庄海洋4. 考虑多次余震作用的地下结构抗震性能研究[J]. 振动与冲击, 2023, 42(17): 70-77.
WANG Jianning1,2,3, ZHANG Guangyu4, XU Jian2, PAN Peng1, ZHUANG Haiyang4. Aseismic performance of underground structure considering multiple aftershocks. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(17): 70-77.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I17/70

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