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Effect of Near-Fault Pulsed Ground Motions on Seismic Response and Seismic Performance to Tunnel Structures
Shock and Vibration ( IF 1.6 ) Pub Date : 2021-06-12 , DOI: 10.1155/2021/9999007
Xiancheng Mei 1, 2 , Qian Sheng 1, 2 , Zhen Cui 1, 2
Affiliation  

Seismic analysis of tunnels close to or crossing seismogenic faults is a complex problem, which is often neglected at the design stage for the lack of specific codes or guidelines and also because underground structures are considered less vulnerable than that of the corresponding above-ground facilities. Near-fault ground motions are generally assumed to providing more powerful energy to tunnel structures. Therefore, a recently developed velocity pulse equivalent model is proposed to synthesize the artificial near-fault pulsed ground motion for the seismic response behavior of the tunnel structure. A newly proposed nonlinear dynamic time history methodology, the incremental dynamic analysis method, is introduced into the analysis of seismic performance and fragility for tunnel structures. This study takes the Zheduoshan tunnel as a case study to illustrate the effects of velocity pulse on the seismic response behavior and seismic performance. The applicability of different seismic intensity measures is preliminarily discussed, and the vulnerability of the tunnel structure at different characteristic locations is analyzed. Afterward, the seismic vulnerability probabilities of the tunnel structure under the action of the near-fault pulsed ground motions and the far-field ground motions are presented, and then, the failure probabilities of the tunnel structure under the three-level support requirements are obtained. Research results provide an objective assessment of the velocity pulse effects and acts as a reference for the likely seismic damage assessment of tunnel structures.

中文翻译:

近断层脉冲地面运动对隧道结构的地震响应和抗震性能的影响

靠近或穿越发震断层的隧道的地震分析是一个复杂的问题,由于缺乏具体的规范或指南,并且地下结构被认为不如相应的地上设施脆弱,因此在设计阶段往往被忽视。通常假设近断层地震动为隧道结构提供更强大的能量。因此,提出了一种最近开发的速度脉冲等效模型来合成人工近断层脉冲地面运动,用于隧道结构的地震响应行为。一种新提出的非线性动力时程方法——增量动力分析法,被引入到隧道结构的抗震性能和易损性分析中。本研究以折陀山隧道为例,说明速度脉冲对地震反应行为和抗震性能的影响。初步探讨了不同地震烈度措施的适用性,分析了隧道结构在不同特征位置的易损性。然后给出近断层脉冲地震动和远场地震动作用下隧道结构的地震易损概率,进而得到三级支护要求下隧道结构的破坏概率。 . 研究结果提供了对速度脉冲效应的客观评估,并为隧道结构可能的地震损伤评估提供了参考。
更新日期:2021-06-13
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