不同波速对刚构桥地震响应影响分析

Analysis of Influence of Different Wave Velocities on Seismic Response of Rigid-framed Bridge

地震激励的输入是大跨桥梁结构抗震设计中最薄弱的环节。大跨度桥梁由于基础间的间距较大,因而在进行地震响应分析是应考虑行波效应的影响。结合工程实例,建立了空间有限元仿真模型,并且对模型进行了全桥结构动力分析,得到了该桥基本的动力特性参数,并对其进行了不同波速作用下行波效应的分析,与一致激励下的结果进行了对比,分析结果将为大跨刚构桥的地震设计提供参考。

The importation of the earthquake incentive is the weakest link in the seismic design of large-span bridge structure.As the greater distance between the foundations of large-span bridge structure,the traveling wave effect should be considered in the earthquake response analysis.According to the engineering cases,the space finite element simulation model is set up,and is carried out of the structural dynamic analysis of the whole bridge to achieve the basic dynamic characteristic parameters of this bridge.The article analyzes the traveling wave effect of the bridge under the different wave velocities of action,and compares the results under the same incentive.The analysis results can be referred for the seismic design of long-span rigid-framed bridge.