全漂浮空间框架塔斜拉桥参数敏感性分析
Sensitivity Analysis of Parameters of Cable-Stayed Bridges with Full Floating Spatial Frame
刘岸清 1燕腾飞 1郑鹏举 1谷彦霖 1李杰 2王强1
作者信息
- 1. 中国建筑第七工程局,河南 郑州 450000
- 2. 郑州大学 土木工程学院,河南 郑州 450001
- 折叠
摘要
为明确设计参数对漂浮体系斜拉桥力学行为影响,该文以某全漂浮体系空间框架式独塔双索面钢-混凝土组合梁斜拉桥为依托,利用有限元分析软件MIDAS/Civil建立大桥有限元模型,针对成桥状态下温度效应、二期恒载、支承体系等参数敏感性开展分析,并与该桥半漂浮体系进行对比.结果表明:温度、二期恒载对主梁挠度和应力影响较为显著;整体而言,全漂浮体系主梁变形和应力对各参数敏感度低于半漂浮体系;结构体系由全漂浮转换为半漂浮后,1阶自振频率由0.38 Hz增至1.09 Hz,结构整体刚度显著提高;地震激励下,全漂浮体系较半漂浮体系整体位移大,但塔根部结构弯矩减小.
Abstract
In order to clarify the influence of design parameters on the mechanical behavior of a cable-stayed bridge of a floating system,a finite element model of the bridge was established by using the finite element analysis software MIDAS/Civil based on a single-tower double-cable plane steel-concrete composite beam cable-stayed bridge with full floating spatial frame.The sensitivity of parameters such as temperature effect,secondary dead load,and support system in the completed bridge state was analyzed and compared with the semi-floating system of the bridge.The results show that temperature and secondary dead load have a significant impact on the deflection and stress of the main beam.Overall,the sensitivity of the deformation and stress of the main beam of the full floating system to various parameters is lower than that of the semi-floating system.After the structural system is converted from full floating to semi-floating,the first-order natural frequency increases from 0.38 Hz to 1.09 Hz,and the overall stiffness of the structure is significantly improved.Under seismic excitation,the overall displacement of the full floating system is greater than that of the semi-floating system,but the bending moment of the tower root structure decreases.
关键词
斜拉桥/全漂浮体系/半漂浮体系/空间框架塔/结构参数/敏感性分析Key words
cable-stayed bridge/full floating system/semi-floating system/spatial frame tower/structural parameter/sensitivity analysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据