大跨度 桥梁在多点激励下的地震反应分析

基于大质量法的计算原理，在通用有限元程序Strand7平台上实现了大跨度桥梁在多点激励下的地震反应分析。在此基础上分别考察了一座主跨428m的三跨连续中承式钢拱桥在一致激励、行波激励和多点激励下的地震反应规律。结果表明，行波效应和多点激励对大跨度拱桥地震反应有较大影响，应予以考虑。

Seismic response analysis of long-span bridges under multi-excitation

Based on large mass method, seismic response analysis of long-span bridges under multi-excitation is implemented on the platform of commercial finite element program Strand7. On this basis, the seismic response analysis of a three-span continuous middle-supported steel arch bridge with a main span of 428m is conducted under different input conditions of uniform excitation, traveling wave excitation and multi-excitation. The results show traveling wave effects and multi-excitation have relatively large influences on seismic responses of long-span arch bridges, which should be taken into consideration.