基于静力推覆分析的穿越地裂缝浅埋地铁车站地震破坏模式研究

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摘要以处于西安f4地裂缝场地的浅埋地铁车站为研究对象，通过开展振动台试验，探讨了地裂缝场地和结构的震害特征。同时，考虑场地地震响应的非一致性，采用静力推覆分析方法，分析了穿越地裂缝浅埋地铁车站的地震破坏模式。结果表明：针对地裂缝场地地下结构的Pushover分析方法能够较真实地反应地震作用下地裂缝场地的活动特征和地下结构的破坏特点。在水平地震作用下，趋于稳定状态的地裂缝上、下盘土体主要进行张合活动（相互挤压与分离）。其中，相互挤压会对结构中柱施加明显附加压弯作用。地裂缝场地土体的水平剪切变形是结构破坏的主要外在因素，而地裂缝活动造成的附加压弯作用会进一步增大中柱轴压比，降低中柱的变形能力，加速结构的地震破坏。在地裂缝场地特征变形作用下，结构底层中柱水平剪切变形能力相对较弱，且结构剪力表现出明显的空间分布规律，上盘结构底层中柱是结构的抗震关键构件。研究结果对该类结构的抗震设计具有重要参考价值。

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	熊仲明 1
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	陈帜 1
	陈轩 1
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	郑坤 1
	阿鑫 3
	4

关键词 ：地裂缝, 地铁车站, 静力推覆分析, 破坏模式

Abstract：The earthquake damage characteristics of the shallow buried subway station crossing the ground fissure (SSGF) were explored through the shaking table test. Then, considering the nonuniformity of the dynamic response of the ground fissure site, a pushover analysis method for the SSGF was used to study the earthquake damage mode of the SSGF. The results show that the pushover method can realistically simulate the activity of the ground fissure site and the damage characteristics of the SSGF in the earthquake. Under the horizontal seismic action, the mutual compression and separation activity mainly occurs in the hanging wall and foot wall, in which the mutual compression will exert the compression-bending effect on the central columns of the SSGF. The horizontal shear deformation of the soil is the main external factor of structural damage, and the additional compression-bending effect will further increase the axial compression ratio of the central column, reduce its deformation capacity, and accelerate the seismic damage of the SSGF. Under the unique deformation of the ground fissure site, the horizontal shear deformation capacity of the columns in the bottom of the SSGF is relatively weak, and the shear force of the structural members shows an obvious spatial distribution pattern. Therefore, the central column at the bottom of the SSGF in the hanging wall is the key seismic member of the SSGF. The research results have important references for the seismic design of these structures.

Key words： ground fissure subway station pushover analysis failure mode

收稿日期: 2022-11-02 出版日期: 2024-01-15

引用本文:

熊仲明 1,2，陈帜 1，陈轩 1,2，郑坤 1，阿鑫 3,4. 基于静力推覆分析的穿越地裂缝浅埋地铁车站地震破坏模式研究[J]. 振动与冲击, 2024, 43(1): 54-63.
XIONG Zhongming1,2, CHEN Zhi1, CHEN Xuan1,2, ZHENG Kun1, A Xin3,4. Seismic failure mode of shallow buried subway station crossing ground fissures based on static pushover analysis. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(1): 54-63.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I1/54

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