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地震波的传播是随时间和空间的不同而变化的,即对于大跨度结构应该考虑地震动的多点输入。本文首先考虑地震波的行波效应,对北京LG大厦进行了时程分析,给出了该结构顶部典型节点的位移、速度和加速度以及两塔楼框架柱位移、层间位移和内力等信息并与在一致激励下的地震反应进行比较分析,探讨了这些节点和框架柱的相关物理量在地震行波作用下的变化规律,结果表明,行波效应对结构地震反应的改变较大。然后,通过对典型框架柱的位移差时程曲线和加速度差时程曲线的比较,分析了行波效应对结构地震反应影响很大的原因。文中根据结构的特点,还进行了结构在不同基础分块行波输入下的地震反应计算,数值结果表明:分块行波输入不能模拟结构基础的地震行波输入。
The propagation of seismic waves varies with time and space, that is, multi-point input of ground motion should be considered for long-span structures. In this paper, we first consider the traveling wave effect of seismic wave, and analyze the time history of Beijing LG Building. The displacement, velocity and acceleration of the top typical node of the structure and the displacement, internal displacement and internal force of two towers’ The results show that the traveling wave effect greatly changes the seismic response of the structure. The results show that the seismic response of the seismic response under the uniform excitation is comparatively analyzed, and the variation of the related physical quantities of these nodes and the frame column under the action of the seismic traveling wave is discussed. Then, by comparing the displacement difference time-history curve and the acceleration difference time-history curve of a typical frame column, the reason why the traveling wave effect greatly affects the seismic response of the structure is analyzed. According to the characteristics of the structure, the seismic response of the structure under the different basic block traveling wave input is also calculated. The numerical results show that the input of the traveling wave of the block traveling wave can not simulate the input of seismic traveling wave based on the structure.