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大跨度斜拉桥各地面支承距离较大 ,一致激励地震输入模式并不符合实际情况 ,应当考虑地震波有限波速传播所引起的行波效应以及部分相干效应和局部场地效应的影响。本文以主跨 1 0 1 8m的某在建大跨度斜拉桥为例 ,数值仿真分析了三种确定性地震波一致激励、行波激励以及随机地震动场多点激励作用下斜拉桥关键部位的地震反应 ,为该斜拉桥的工程设计提供了可靠的理论依据
The long-span cable-stayed bridges have a large supportive distance between the ground and the consistent excitation seismic input mode is not in line with the actual situation. The traveling wave effect due to the limited wave propagation of the seismic wave and the partial coherence effect and the local site effect should be considered. Taking a long-span cable-stayed bridge under construction with a span of 1,018m as an example, the numerical simulation analyzes three kinds of deterministic seismic wave excitation, traveling wave excitation and random earthquake field multi-point excitation under the key parts of cable-stayed bridge The seismic response provides a reliable theoretical basis for the engineering design of the cable-stayed bridge