山区大跨径钢桁梁悬索桥静风稳定及抖振响应研究  

Study of stable and shaking response in the mountainous area of large span steel truffle suspension bridges

作　　者：张剑锋 徐向东 蓝先林 王维利[1] 唐志[1] 康可心[1] ZHANG Jianfeng;XU Xiangdong;LAN Xianlin;WANG Weili;TANG Zhi;KANG Kexin(Guizhou Provincial Transportation Planning Survey and Design Institute Co.,Ltd.,Guiyang 550081,China)

机构地区：[1]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550081

出　　处：《地震工程与工程振动》2023年第2期247-258,共12页Earthquake Engineering and Engineering Dynamics

基　　金：贵州省重大科技专项基金项目(黔科合重大专项([2016]3013))。

摘　　要：为研究山区大跨径钢桁梁悬索桥的静风稳定性及抖振响应,首先根据规范确定悬索桥各构件的等效静阵风风速,其次采用加劲梁节段模型试验及有限元数值模拟分别确定了主梁和桥塔的三分力系数,采用谐波合成法进行桥位各主要点的脉动风速合成,然后基于Davenport抖振响应理论,结合大型通用有限元软件进行主桥结构静风稳定和抖振响应计算分析。研究结果表明:当风攻角为α=0°时,主梁断面成桥状态的阻力系数、升力系数、扭矩系数分别为C_(D)=1.2794、C_(L)=0.1420、C_(M)=-0.015;在0°、±3°风攻角下,主桥结构成桥状态静风失稳临界风速满足规范要求;将成桥状态的等效静阵风荷载和抖振力组合,可得出设计基准风速下结构的风荷载内力极值,为同类型桥梁设计提供依据。研究成果可为山区同类型悬索桥的抗风设计提供参考。In order to study the static wind stability and shaking response of the large span steel truffle suspension bridge of the mountain area,first determine the equivalent static and wind speed of each component of the suspension bridge according to the specifications,and secondly,the model test of the intensive beam section and the finite element value simulation are determined separately,respectively.The three-point force coefficient of the main beam and the bridge tower uses the harmonic synthesis method for the pulse speed synthesis of the main points of the bridge.Calculation and analysis of vibration response.The research results show that when the wind attack angle isα=0°,the resistance coefficient,lift coefficient,and torque coefficient of the main beam section are C_(D)=1.2794,C_(L)=0.1420,C_(M)=-0.015;Under the angle of the wind attack,the main bridge constitutes the static wind and stability of the critical wind speed of the bridge status to meet the requirements of the norms;Extreme value,provides a basis for the design of the same type of bridge.Research results can provide reference for the wind resistance design of the same type of suspension bridge in the mountains.

关 键 词：钢桁梁悬索桥 等效静阵风 有限元数值模拟 静风稳定 抖振响应 

分 类 号：U448[建筑科学—桥梁与隧道工程]