某大型火车站多维多点地震响应时程分析

Multidimensional seismic response time history analysis of a large railway station

某大型火车站南北长358m,东西宽178m,属于超长大跨度空间结构,规范要求进行多维多点输入下的地震响应时程分析。考虑建筑规模和场地条件等因素,对该火车站结构进行了考虑行波效应影响的多维多点输入下的地震响应计算,分析了行波效应对结构变形和构件内力的影响。将多维多点地震输入与一致地震激励输入进行了比较,结果表明:行波效应对站房分隔缝附近的竖向构件和角柱的剪力和弯矩影响较大,其中Y向剪力尤为明显,从而使得结构分隔缝附近的局部变形也偏大,在设计中需要采取加强措施。

The building of a large railway station is 358 m long in North and South and 178 m wide in East and west. It is a super long-span spatial structure,and requires multi-dimensional and multi-point seismic response time history analysis according the code. Considering the factors of building scale and site conditions,the seismic response of this station under multi-point and multi-dimensional input considering the effect of traveling wave is calculated,and the effects of traveling wave on structural deformation and internal forces of components are analyzed. Comparing the multi-dimensional and multi-point seismic input with the uniform seismic excitation input,the results show that the traveling wave effect has a great influence on the shear and moment of the vertical members and corner columns near the partition joints of the station buildings,especially the Y-direction shear force,which makes the local deformation near the partition joints of the structure bigger.