空间变化地震动激励下高墩大跨刚构桥响应分析

地震响应是桥梁抗震研究中的重要问题。基于随机振动理论及反应谱方法,分析了高墩大跨连续刚构桥梁在平稳地震激励下,地震动空间变化对结构内力的均方根响应的影响。结果表明：不计地震动空间变化时,随机振动分析与反应谱方法本质上是一致的;行波效应和相干损失对连续刚构内力有一定影响,多数情况下,随机振动计算结果要大于反应谱分析结果;...

Response Analysis of the High-piers and Long-span Rigid Frame Bridge Subjected to Varying Spatial Seismic Excitation

Analysis of seismic response is very important to the seismic design of the bridge.Based on theory of random vibration and response spectral method, the mean square root response of the internal forces of high-piers and long-span continuous rigid frame-beam bridge subjected to the stationary random seismic excitation, effected by the varying spatial seismic action, are investigated in this paper. The conclusions show that: analysis of random vibration is in accord with the response spectrum method excluding the spatial variation effect of the seismic action; second, the wave propagation effect and the coherence loss would surely change the internal forces of the continuous rigid frame-beam bridges and the computed conclusions by random vibration are greater than by response spectrum in most circumstance; third, the large differences of the site conditions of the bases significantly change the response of the continuous rigid frame-beam bridges, which should be included in the seismic design of the bridges