波纹钢腹板连续刚构桥弹性动力响应分析

Analysis of Elastic Dynamic Response of Continuous Rigid Frame Bridge of Corrugated Steel Webs

为了研究波纹钢腹板-PC组合梁桥的弹性动力性能,本文依托西阜高速保定段胭脂河大桥,通过Midas-Civil有限元分析软件建立两种桩-土效应分析模型,在自振特性的基础上,采用动力时程分析法对结构进行抗震计算分析,得出了水平地震力作用下结构的最不利受力位置。主要结论如下:(1)直接嵌固模型和"m法"模型同阶模态对应的自振频率依次减小,这说明考虑桩-土相互作用之后,结构刚度减小,桥梁结构自振周期逐渐增大;(2)在水平地震力作用下,波纹钢腹板连续刚构桥墩底弯矩最大,T构根部为剪力和轴力最大部位,说明地震作用下,桥墩墩底和T构根部为最不利构件,容易发生弯曲破坏和剪切破坏。

In order to study the elastic dynamic performance of corrugated steel webs-PC composite girder bridge,this paper relies on the Midas-civil finite element analysis software to establish two kinds of pile-soil effect analysis models,and on the basis of the self-vibration characteristics,the dynamic time History analysis method is used to analyze the seismic calculation of the structure,the most unfavorable force position of the structure under the action of horizontal seismic force is obtained. The main conclusions are as follows: the self-vibration frequency corresponding to the same order modal of the direct embedding model and the"m method"model decreases in turn,which shows that after considering the pile-soil interaction,the structural stiffness decreases and the self-vibration period of the bridge structure increases gradually. Under the action of horizontal seismic force,the bottom bending moment of the continuous rigid frame pier of corrugated steel webs is the largest,and the T-structure root is the largest part of shear force and axial force.It is explained that under the action of earthquake,the bottom and T structure of Pier are the most unfavorable components,which are prone to bending failure and shear failure.