Investigations of seismic response to an irregular-section subway station structure located in a soft clay site
Investigations of seismic response to an irregular-section subway station structure located in a soft clay site
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软粘土场地不规则断面地铁站结构地震反应研究
DOI：
10.1016/j.engstruct.2020.110799
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发表时间：
2020
影响因子：
5.5
通讯作者：
Chen Hua-Peng
中科院分区：
文献类型：
--
作者：
Tang Baizan;Li Xiaojun;Chen Su;Zhuang Haiyang;Chen Hua-Peng
通过振动台试验研究了粉质粘土与地铁异形截面车站的动力相互作用。试验过程中，采用形状加速度阵（SAA）测量模型土体的侧向变形，采用非接触式动态位移测试方法，将车站结构的地震破坏过程可视化和数字化。典型的测试结果，包括动土压力，地震沉降，变形，和加速度的不同层次的结构，解释。结果表明，地铁车站的位移在相位和幅值上更受周围粉质粘土的控制。SAA可以有效地测量土体变形，相对侧向位移与土层深度的关系可以很好地拟合为余弦函数，特别是在强震作用下。地震沉降与阿里亚斯烈度显著相关，地铁车站经历了显著的不均匀沉降，导致土-结构在垂直方向上分离。多层异形截面地铁车站的变形模式为剪切模式。最大层间位移比约为1/171。浅埋地铁车站结构的下层构件，特别是中心柱，经历了累积损伤。因此，在地铁车站结构抗震设计中，应充分考虑结构构件的鲁棒性和中心柱的延性。
In this study, shaking table tests were performed to investigate the dynamic interaction of a silty-clay soil with an irregular-section subway station. During the tests, a shape acceleration array (SAA) was used to measure the lateral deformation of the model soil, and a non-contact dynamic displacement testing method was applied to visualize and digitalize the seismic damage process of the station structure. Typical test results, including the dynamic earth pressure, seismic settlement, deformation, and acceleration of different levels of the structure, were interpreted. The results indicated that the movement of the subway station was more controlled by the surrounding silty-clay soil in terms of phase and amplitude. SAA can effectively measure the soil deformation, and the relationship between the relative lateral displacement and soil depth can be well fitted in a cosine function, especially when subjected to strong earthquakes. Seismic settlement is significantly linked to Arias intensity, and the subway station experienced significant uneven settlement, resulting in soil-structure separation in the vertical direction. The multi-story irregular-section subway station deforms in a shear mode. The maximum inter-story drift ratio was approximately 1/171. The components in the lower layers of the shallow-buried subway station structure, particularly in the central columns, underwent cumulative damage. Hence, more robust forms of structural members and the ductility of central columns should be carefully considered in the seismic design of subway station structures.