【摘要】 介绍了多点激励下结构运动方程的求解方法。以某大跨度铁路连续刚构桥为工程背景,用有限元软件MIDAS建立了结构有限元模型,选取地震波波速为主要参数,对某铁路大跨长联连续刚构桥进行了考虑行波效应的时程反应分析,并与一致激励下的结果进行了对比。结果表明:考虑行波效应后,跨中截面的弯矩增大,而墩底截面的弯矩减小。在梁部结构的抗震设计中应考虑行波效应的影响。更多还原

【Abstract】 Solution of motion equations of a structure under multi-support excitations is introduced in this paper.Taking a long-span continuous rigid-frame railway bridge as an example,considering earthquake wave speed as main parameter,time history analysis of railway long-span and long-conjunction continuous rigid-frame bridge under traveling wave excitation is performed,and the comparative analysis of the results under the traveling wave and uniform excitation is made.The results show that the moment at the mid span of girder is increasing but the moment at the pier bottom is decreasing with considering traveling wave effect.So traveling wave effect should be considered in the seismic design of girder structure.更多还原