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反应位移法作为一种较合适的地下结构拟静力抗震分析方法,其等效动荷载的确定对地下结构抗震结果的影响较大。借助一维土层地震反应分析,获得土体在地震动荷载作用下的动力反应,从而取得地下结构顶底标高处产生最大相对变形时刻的荷载参数,并以此作为确定反应位移法等效动荷载的依据。结合上海轨道交通圆形区间隧道工程实例,阐述了具体抗震分析过程,可为地下交通隧道结构的抗震设计提供借鉴。
As a more appropriate method of quasi-static seismic analysis of underground structures, reaction displacement method has a great influence on the seismic response of underground structures. With the help of the one-dimensional seismic response analysis of soil, the dynamic response of soil under dynamic ground motion can be obtained, and the load parameters at the time of maximum relative deformation at the top and bottom elevation of underground structure can be obtained. Basis of load. Combining with the example of roundabout tunnel in Shanghai rail transit, the specific seismic analysis process is expounded, which can provide reference for the seismic design of the underground traffic tunnel.