基于耐震时程法的地下结构序列地震作用抗震性能研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (15) : 261-268.

论文

王国波1，王鸿杰1，王建宁2，金立国3，赵丁凤4

作者信息 +

Aseismic performance of underground structure under mainshock-aftershock sequences based on endurance time analysis

WANG Guobo1, WANG Hongjie1, WANG Jianning2, JIN Liguo3, ZHAO Dingfeng4

Author information +

文章历史 +

摘要

针对当前地铁地下结构抗震性能研究大多仅考虑主震影响而忽略地震后可能伴随发生的多次余震作用问题，开展了地下结构在主余震序列作用下的动力响应规律研究，选取典型两层三跨地铁车站为原型，建立了土–地下结构相互作用的有限元数值模型，基于耐震时程法基本概念并结合我国相关抗震标准设计反应谱生成2条耐震时程曲线，构造了12条主余震序列输入，研究了地铁地下车站在主余震序列作用下的侧向变形特征以及损伤破坏规律。结果表明：耐震时程法可以作为主余震序列作用下地下结构抗震性能研究的一种新的高效方法；主震后带损伤结构的侧向变形应充分考虑主余震序列峰值强度比α影响，主震水平与破坏状态越高，则产生余震增量损伤的临界值强度比α越小，结构面临更严重破坏的风险也越高。研究成果为结构在序列型地震作用下的抗震分析与评估提供了新的思路。

Abstract

At present, most researches on the seismic performance of underground subway structures only consider the influence of mainshock, ignoring several aftershocks that may occur later. In this paper, the dynamic response of underground structures under mainshock-aftershock sequences is studied. A typical 2-story and 3-span subway station is selected as the prototype, and the finite element model of soil-underground structure interaction is established. Based on the basic concept of s endurance time analysis (ETA) method and the design response spectrum of relevant seismic standards in China, 2 endurance time acceleration functions (ETAs) are generated, and 12 mainshock-aftershock sequence inputs are constructed. The lateral deformation characteristics and damage failure law of subway stations under the action of mainshock-aftershock sequences are studied. The results show that the ETA method can be used as a new and efficient method to study the seismic performance of underground structures under the action of mainshock-aftershock sequences. The influence of the peak intensity ratio α of the mainshock-aftershock sequence on the lateral deformation of damaged structures after the mainshock should be fully considered. The higher the mainshock level and the failure state, the smaller the critical value of the aftershock incremental damage, and the higher the risk of more serious damage to the structure. The research results provide a new idea for seismic analysis and evaluation of structures under subjected to sequential earthquakes.

导出引用

王国波1，王鸿杰1，王建宁2，金立国3，赵丁凤4. 基于耐震时程法的地下结构序列地震作用抗震性能研究[J]. 振动与冲击, 2024, 43(15): 261-268

WANG Guobo1, WANG Hongjie1, WANG Jianning2, JIN Liguo3, ZHAO Dingfeng4. Aseismic performance of underground structure under mainshock-aftershock sequences based on endurance time analysis[J]. Journal of Vibration and Shock, 2024, 43(15): 261-268

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