非一致地震激励下大跨度斜拉桥空间响应分析

基于二维相干非一致激励功率谱模型，采用随机过程理论关于幅值、相位与功率谱的关系式，根据场地地震危险性评价和设计地震动参数合成人工地震波，考虑波动传播效应和多点激励效应，分析了某座跨长江的大跨度斜拉桥在地震激励下的空间非线性响应特性，计算了桥梁结构关键部位在地震力作用下的响应特性，并与一致激励下对应响应量进行比较。认为非一致激励下大跨斜拉桥关键部位的某些响应粱大幅增加。反应了进行非一致响应分析的必要性。

Analysis on Spatial Seismic Response of Long-span Cable-stayed Bridge Under Asynchronous Excitation

The artificial seismic waves were simulated according to seismic risk evolution and the earthquake parameters of the site,with the relationship between amplitude,phase angels and power spectra in stochastic process being used and a two-dimensional coherency function-an asynchronous excitation power spectral density(PSD) model being employed as well.A long-span cable-stayed bridge across Yangzi River subjected to the spatial seismic excitation was analyzed,during which course the effects of geometric nonlinear,traveling wave and multipoint excitation were considered.Several results of concerned sections under asynchronous excitation and synchronous excitation were supplied,between which comparison showed the some responses amplifying with asynchronous condition.Conclusions supported the necessity of asynchronous responses analysis.