饱和场地中异跨地铁车站地震响应特性分析

Analysis of Seismic Response of an Unequal-span Metro Station in Saturated Sites

为研究饱和场地中异跨地铁车站结构体系地震动力响应特性问题,以某异跨地铁车站为研究对象,基于有限元分析软件MIDAS-GTS(Midas Geotechnical and Tunnel analysis System)建立异跨地铁地下车站结构体系三维有限元数值模型,选取弹性模量、黏聚力、泊松比、摩擦角作为敏感性影响参数,采用正交试验方法和饱和两相介质动力分析方法进行参数敏感性分析。研究结论表明:剪力墙和悬挑跨附近易发生受弯破坏,中柱易发生受剪破坏;在单一横向地震动作用下或者水平与竖向地震动共同作用下,弹性模量影响最大,泊松比和摩擦角的敏感性次之,黏聚力影响最小。此动力响应特性分析流程方法可为异跨地铁车站抗震设计提供参考。

The seismic response characteristics of an unequal-span subway station structure system in saturated site are studied.A three-dimensional finite element numerical model of this structure system is established based on the finite element analysis software MIDAS-GTS.The elastic modulus,cohesion,Poisson's ratio and friction angle are selected as the sensitivity influence parameters.The saturated two-phase medium dynamic analysis method and the orthogonal test method are used for parameter sensitivity analysis to obtain the range of the corresponding seismic response.The research results show that the shear wall and overhang span are prone to yield bending damage,while the central columns are prone to yield shear damage;Under the action of a horizontal ground motion or the combination action of the horizontal and vertical ground motions,the influence of elastic modulus is the largest,the sensitivity of Poisson's ratio and friction angle is the second,and the influence of cohesion is the smallest.This procedure of seismic response characteristics analysis for the unequal-span subway station structure system may provide a reference for the seismic design of unequal-span subway station structures.