论文部分内容阅读
以湖北四渡河大跨悬索桥为工程背景,建立了悬索桥精细有限元模型,采用多维多点非平稳随机地震响应分析方法,数值仿真了该桥在单维与三维非平稳随机地震动的一致激励、行波效应、部分相干效应、部分相干+行波效应以及多点激励下的地震响应,分析了多维多点地震激励下视波速及地震非平稳性对结构随机地震响应的影响.研究结果表明:考虑地震动的空间效应对悬索桥结构响应有很大影响,地震动的行波效应对结构响应的影响比部分相干效应的影响大的多;三维地震作用下的结构响应比单维地震的作用明显增加;随着视波速的增大,行波效应对结构响应的影响减弱;按照平稳地震激励所作的随机地震响应分析,计算结果是偏安全的.
Taking the four-span long-span suspension bridge in Hubei Province as the engineering background, the fine finite element model of the suspension bridge was established. The multi-dimensional multi-point non-stationary random seismic response analysis method was used to simulate the consistent excitation of the uniaxial and random three- Wave effect, partial coherent effect, partial coherent + traveling wave effect and multi-point excitation, the effects of apparent wave velocity and non-stationary seismicity on random earthquake response of multi-dimensional multi-point seismic excitation are analyzed.The results show that: Considering the spatial effect of ground motion has a great influence on the structural response of the suspension bridge, the effect of the traveling wave of the ground motion on the structural response is much larger than that of the partial coherence effect. The structural response under the three-dimensional earthquake is more obvious than the one-dimensional earthquake With the increase of apparent wave velocity, the effect of traveling wave on the structure response is weakened. According to the random seismic response analysis of steady earthquake excitation, the calculation result is partial safty.