【摘要】 通过建立空间结构有限元模型,利用一种计算效率很高的随机振动理论—虚拟激励法对大跨度斜拉拱桥的随机振动地震响应进行了研究。将该桥的动力特性以及由施加于该桥纵向激励、纵+竖向激励、横+竖向激励、纵+竖+横向激励所得到的随机振动地震响应,与相同跨径的钢管混凝土拱桥进行对比分析,可以得到:大跨度斜拉拱桥中斜拉索的存在改善了主拱肋拱脚附近的受力,提高了拱桥的抗震性能。更多还原

【Abstract】 In this paper,a highly efficient random vibration algorithm,the pseudo-excitation method(PEM),is developed for the random vibration analysis of seismic responses of a long-span cable-stayed arch bridge. The dynamic characteristics and seismic response behavior of the bridge subjected to longitudinal excitation,longitudinal and vertical excitation,transverse and vertical excitation,three-dimensional excitation are studied.Compared to the same span arch bridge,the exist of the cables reinforces the arch springing against seismic force and improves aseismatic characteristic of arch bridge.更多还原