【摘要】 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。更多还原

【Abstract】 The seismic wave dissemination is different changes along with the time and the space,that should be considered for long-span structures of multi-point input.First,time-history analysis of Beijing LG Building under uniform excitation and traveling wave excitation were studied.The displacement,velocity and acceleration of the typical node at the top of the structure as well as the displacement,story displacement and internal force of the frame columns were given,and compared with those under the excitation of uniform input.The rules of the respective physical variables of those nodes and frame columns under the excitation of seismic traveling wave were studied.The results show that,traveling wave effect makes the seismic responses of the structure a great change.Then,the reasons of great influence of traveling wave effect was analyzed through comparison of typical frame columns by difference-time history curve of displacement and acceleration.Finally,the seismic response of the structure were calculated under the excitation of the different sub-blocks traveling wave at the structural basis according to structural characteristics.The numerical results show that the sub-blocks traveling wave input can’t be instead of the seismic traveling wave input at the structural basis.更多还原