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。
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.
作者
刘岸清
燕腾飞
郑鹏举
谷彦霖
李杰
王强
LIU Anqing;YAN Tengfei;ZHENG Pengju;GU Yanlin;LI Jie;WANG Qiang(China Construction Seventh Engineering Division Corp.,Ltd.,Zhengzhou,Henan 450000,China;School of Civil Engineering,Zhengzhou University,Zhengzhou,Henan 450001,China)
出处
《中外公路》
2024年第6期168-175,共8页
Journal of China & Foreign Highway
基金
河南省交通运输科技计划项目(编号:2021J2)。
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
cable-stayed bridge
full floating system
semi-floating system
spatial frame tower
structural parameter
sensitivity analysis
