随机地震动场多点激励下大跨度连续刚构桥的地震反应分析

Seismic response analysis for long-span continuous rigid-framed bridges under multi-support excitations of random earthquake ground motions

本文基于随机地震动场的功率谱模型和多点地震激励,建立了大跨度桥梁在随机地震动场多点激励的地震反应分析方法,并数值模拟了某四跨预应力混凝土连续刚构桥的地震反应,考虑了行波效应、部分相干效应和局部场地效应等因素的影响,并与确定性地震一致激励下的计算结果进行了比较,对工程建设具有参考意义。

In this paper, based on the power spectral model and multi-support excitations of random earthquake ground motions, the analysis method for seismic responses of long-span bridges is presented under the multi-support excitations of random earthquake ground motions, and the seismic responses of a four-span continuous rigid-framed bridge are numerically simulated, in which the traveling wave effect, incoherence effect and site effect are considered and the results are compared with those under the uniform excitations of deterministic earthquakes.This study may be a reference for the engineering construction.