基于有限元的外倾式双索面矮塔斜拉桥动力特性参数敏感性分析

Sensitivity Analysis of Dynamic Characteristics Parameters of Externally Inclined Double Cable Plane Low Pylon Cable-Stayed Bridge Based on Finite Element Method

为研究外倾式双索面矮塔斜拉桥结构动力特性及影响该种桥型结构动力特性的参数敏感性,本文基于浮山丞相河特大桥87+160+87 m外倾式双索面矮塔斜拉桥实例工程,采用Midas/Civil 2019有限元软件对实例工程进行建模,在成桥状态工况下对主桥结构进行动力特性分析,同时选取主塔外倾角度β、桥塔无索区高度h、桥塔纵桥向长度b等影响结构动力特性的参数进行对比分析,得出影响结构动力特性的敏感参数,可为同类型桥梁在结构设计时提供参考。

In order to study the dynamic characteristics of the external inclined double cable plane low tower cable-stayed bridge structure and the parameter sensitivity that affects the dynamic characteristics of this type of bridge structure,in this paper,based on the example project of 87+160+87 m extroversive double plane cable stayed bridge in Fushan Chengxiang River Bridge,Midas/Civil 2019 finite element software is used to model the case project,the dynamic characteristics of the main bridge structure are analyzed under the condition of bridge completion.At the same time,the parameters that affect the dynamic characteristics of the structure,such as the inclination angle of the main towerβ,the height of the cable free zone of the bridge tower h,and the longitudinal length of the bridge tower b,are compared and analyzed,and the sensitive parameters that affect the dynamic characteristics of the structure are obtained,which can provide references for the structural design of similar types of bridges.