行波效应对铁路斜拉桥地震反应的影响

The Influence of Traveling Wave Effect on Seismic Response of Railway Cable-stayed Bridge

阐述了应用大质量法模拟行波效应的基本原理,推导了大跨度桥梁考虑行波效应影响的分析模型及求解方法.以某一实际铁路大跨斜拉桥为工程背景,分析了在不同的视波速下的行波效应对斜拉桥主塔地震反应的影响,并与一致激励下的结果进行了对比.结果表明:行波效应对铁路斜拉桥主塔的地震反应影响较为显著,进行抗震设计时,应重视行波效应对主塔的不利影响.

Basic principle using large mass method for simulating traveling wave effect is presented,and the model and equations used for measuring the effects of traveling wave on seismic response of long-span bridges are derived.Taking some constructed railway cable-stayed bridge as an example,the influence of traveling wave effect at different earthquake wave speed on seismic response of the main tower is analyzed and the traveling wave result is compared with the uniform excitation result.The result showes that the influence of traveling wave effect on seismic response of main tower is significant,so the adverse influence should be emphasized in seismic design of main tower.