单肋钢箱拱桥动力响应分析

Dynamic response analysis of single ribbed steel box arch bridge

以宁波市某轨道交通单肋钢箱拱桥为背景,应用大型通用有限元软件MIDAS/civil,完成了单肋钢箱拱桥有限元模型建立,利用模型得到了该桥梁的自振特性;采用时程分析方法,选取调幅后的EI-Centor地震波,模拟了拱桥在地震作用下的响应,分析了其拱肋截面与墩顶的振动情况,并对比了地震波正交作用下结构的位移响应峰值与地震波单独作用下的位移响应峰值,对钢箱拱桥的抗震设计有一定参考意义。

This paper bases on a single ribbed steel box arch bridge which locate in Ningbo urban railway transit line,though building the finite element model by MIDAS/civil,we get the self-vibration characteristics of this bridge,though using time history method and selecting adjusted EI-Centor seismic wave,we simulate the bridge dynamic response in seismic period and analyze the vibration in it arch section and the top of bridge pier,the paper also makes a comparison in displacement response peak value between orthogonal seismic wave effects and single seismic wave effects. These works have some reference value for this kind of bridge.