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为了分析斜入射地震作用下地铁车站结构的抗震性能,以苏州地铁一号线星海广场车站双层地下结构为分析对象,建立了地震反应三维实体有限元模拟模型,模拟了斜入射地震作用下地下结构与围岩土体系统的三维地震反应,系统分析了大型地下结构地震反应的空间效应与永久变形规律.结果表明:土体在地震作用下产生了不可恢复的塑性变形,主要为地表沉降,并显著受地震动入射角度的影响.大型地下结构地震反应的空间效应显著,纵向地震反应表现为中柱较边柱强烈,永久变形大;横向地震反应表现为内侧柱较外侧柱强烈,永久变形大.中柱是地下结构抗震最薄弱的部位,结构设计时建议中柱采用铰接,只承担竖向荷载,不承担水平剪力,将有利于提高地下结构的整体抗震性能.
In order to analyze the seismic performance of the subway station under the effect of oblique incident earthquake, the three-dimensional finite element simulation model of seismic response is established by taking the double-layer underground structure of Xinghai Square Station of Suzhou Metro Line 1 as the analysis object. Structure and seismic response of surrounding rock and soil system, the spatial effect and permanent deformation law of large-scale subsurface seismic response are systematically analyzed.The results show that the soil has irreversible plastic deformation under the action of earthquake, mainly including surface subsidence, Which is significantly affected by the incident angle of ground motion. The spatial effect of seismic response of large-scale subsurface structures is remarkable, and the longitudinal seismic response is characterized by strong and permanent deformation of the center column compared with the side columns. The transverse seismic response is that the medial column is stronger and permanent deformation than the lateral column Large.Central column is the weakest part of the earthquake resistance of underground structures, the structural design of the proposed hinge column, only to bear the vertical load, does not assume horizontal shear, will help improve the overall seismic performance of underground structures.