上覆荷载对浅埋地下结构抗震性能的影响

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摘要保障地下结构具备足够的抗震性能对于降低结构损伤和提升灾后恢复效率均具有重要意义。为此，利用静-动力耦合的非线性数值分析方法，对不同上覆荷载作用下典型地铁车站的塑性铰发展特性及承重构件截面的弯曲延性需求进行了分析。研究表明：地震作用下弯曲塑性铰首先出现在中柱端部，高轴压比极大削弱了中柱的抗震性能并导致结构整体水平变形能力劣化；结构上覆荷载条件对中柱截面曲率延性系数的影响显著，但对侧墙的影响较为有限；车站承重构件截面延性系数与层间位移角的关系可采用二次多项式函数描述，给出的相应拟合关系式可为抗震设计中构件截面延性比需求的评估提供相关参考。

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	张静堃1
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	于仲洋3
	张鸿儒1
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	张泽1
	2

关键词 ：轴压比, 地下结构, 抗震性能, 地震损伤破坏, 动力有限元分析

Abstract：It is of great significance to ensure the sufficient seismic performance of underground structures for reducing structural damage and improving post-disaster recovery efficiency. Therefore, based on the static-dynamic coupling nonlinear numerical analysis method, the developing characteristics of bending plastic hinges of typical subway stations and the ductility demand of critical load-bearing component sections under different overburden loads were analyzed. The results showed that the bending plastic hinge first appears at the end sections of central columns under seismic action, and the high axial compression ratio significantly weakens the seismic performance of columns, which leads to the degradation of the structural horizontal deformation capacity. The influence of the overburden load conditions on the ductility coefficient of the central column sections is significant, but the influence on the side wall is limited. The relationship between the sectional ductility coefficient of the load-bearing components and the interlayer drift ratio can be described by quadratic polynomial functions, and the corresponding fitting functions can provide relevant references for evaluating column ductility demand in the seismic design.

Key words： axial compression ratio underground structures seismic performance seismic damage dynamic finite element analysis

收稿日期: 2022-08-07 出版日期: 2023-05-28

引用本文:

张静堃1,2，于仲洋3，张鸿儒1,2，张泽1,2. 上覆荷载对浅埋地下结构抗震性能的影响[J]. 振动与冲击, 2023, 42(10): 263-272.
ZHANG Jingkun1, 2， YU Zhongyang3， ZHANG Hongru1, 2， ZHANG Ze1, 2. Influence of overburden load on seismic performance of shallow buried underground structures. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(10): 263-272.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I10/263

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