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在地震作用下,探究上下近接、最小竖向净距2 m——地下商场和地铁车站的危险截面和相互影响规律。结合地铁抗震规范相关要求确立该工程的6种计算工况,建立三维模型运用时程分析法进行计算得出:相比两个结构单独存在,上下近接组合形式的结构动力响应均发生了一定量的增幅;结构构件距两结构相邻面越近,动力响应的增幅越大。因此,两个结构相邻面是地震发生时的危险截面。上下近接的地下结构的相互影响规律和危险截面等结论对以后的设计、施工能起到一定的指导作用。
Under the action of the earthquake, explore the next up and down, the minimum vertical spacing 2m - underground shopping malls and subway stations of the dangerous cross-section and interaction law. Six kinds of calculation conditions of the project are established according to relevant requirements of subway seismic code. The establishment of three-dimensional model is calculated by using the time-history analysis method. Compared with the two structures alone, the dynamic responses of the structures in the upper and lower adjacent combinations all occur a certain amount ; The closer the structural member is to the adjacent surface of the two structures, the greater the dynamic response increases. Therefore, the two structural adjacent faces are dangerous cross-sections when an earthquake occurs. The results of the interaction between the upper and lower adjacent structures of underground structures and the dangerous cross sections can play a guiding role in the future design and construction.