多跨径连续梁拱组合体系桥梁的抗震分析

Seismic Analysis of Multi-Span Continuous Beam Arch Composite Bridge

为分析多跨径连续梁拱组合体系桥梁的抗震性能,结合某多跨径连续梁拱组合体系桥梁实际工程,采用有限元分析软件建立桥梁的地震动力时程分析模型,并根据振动方程获取桥梁结构的地震响应。研究结果显示:一维地震作用下,桥梁结构位移时程响应最大值为0.079m;多维地震作用下,桥梁结构位移时程响应最大值为1.228m。因此可知,多维地震作用下桥梁结构抗震性能更薄弱,进行多跨径连续梁拱组合体系桥梁的抗震设计时应兼顾横桥向与顺桥向地震作用的影响。

In order to analyze the seismic performance of multi-span continuous beam arch composite bridge,according to the practical engineering of a multi-span continuous beam-arch combined bridge,the seismic dynamic time-history analysis model of the bridge was established by using finite element analysis software,and the seismic response of the bridge structure was obtained according to the vibration equation.The results show that under one-dimensional seismic action,the maximum displacement time-history response of the bridge structure is 0.079 m;Under multi-dimensional seismic action,the maximum displacement time history response of bridge structure is 1.228 m.So the seismic performance of bridge structure is weaker under multi-dimensional earthquake action.The seismic effects of cross bridge and forward bridge should be taken into account in the seismic design ofmulti-span continuous beam arch composite bridge.