斜风下三塔斜拉桥抗风稳定性研究  

Study on wind stability of three-tower cable-stayed bridges under skew wind

作　　者：张新军[1] 冷宇涵 李寒妍 ZHANG Xinjun;LENG Yuhan;LI Hanyan(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310023

出　　处：《浙江工业大学学报》2025年第2期229-236,共8页Journal of Zhejiang University of Technology

基　　金：浙江省公益技术应用研究项目(LGF22E080018)。

摘　　要：采用斜风下大跨度桥梁三维空气静力和动力稳定性分析程序,以主跨1400 m的三塔斜拉桥设计方案为研究对象,分析其动力特性和斜风下的结构稳定性(包括空气静力和动力稳定性),揭示斜风下三塔斜拉桥空气静力和动力失稳的特点及其主要影响因素。研究结果表明:三塔斜拉桥结构柔性显著,竖向刚度和横向刚度均很小,对横桥向风作用敏感;三塔斜拉桥呈现出竖向弯曲和扭转耦合的空气静力失稳形态,斜风分解法会高估三塔斜拉桥的空气静力稳定性,斜风效应对三塔斜拉桥的空气静力稳定性的影响随着风偏角的增大逐渐增大,故对三塔斜拉桥的空气静力稳定性的准确评估必须采用斜风下大跨度桥梁三维空气静力分析方法;斜风分解法会高估或低估三塔斜拉桥的空气动力稳定性,斜风效应和静风效应均会降低三塔斜拉桥的空气动力稳定性,而斜风和静风效应的综合作用将进一步降低三塔斜拉桥的空气动力稳定性。因此,分析三塔斜拉桥空气动力稳定性时必须考虑斜风和静风效应的综合影响。By using a computational procedure of three-dimensional aerostatic and aerodynamic stability analysis of long-span bridges under skew wind,the dynamic characteristics and the structural stability including the aerostatic and aerodynamic stability under skew wind are analyzed for a three-tower cable-stayed bridge with a main span of 1400 meters and the characteristics and main influencing factors of the aerostatic and aerodynamic instability of the three-tower cable-stayed bridge under skew wind are revealed.The results show that the three-tower cable-stayed bridge has significant flexibility with smaller vertical and especially horizontal stiffness and is sensitive to the transverse wind actions.The three-tower cable-stayed bridge exhibits a coupled aerodynamic instability pattern between vertical bending and torsion.The skew wind decomposition method overestimates the aerostatic stability of the three-tower cable-stayed bridge.The effect of skew wind on the aerostatic stability of the three-tower cable-stayed bridge gradually becomes apparent with increasing the wind yaw angle.To accurately evaluate the aerostatic stability of the three-tower cable-stayed bridge,it is necessary to use a three-dimensional aerostatic analysis method for long-span bridges under skew wind.The skew wind decomposition method may overestimate or underestimate the aerodynamic stability of the three-tower cable-stayed bridge.The skew wind and particularly the static wind effect will reduce the aerodynamic stability of the three-tower cable-stayed bridge and the combined effect between skew wind and static wind will further reduce the aerodynamic stability of the three-tower cable-stayed bridge.Therefore,the skew and static wind effects must be comprehensively considered in the aerodynamic stability analysis of the three-tower cable-stayed bridge.

关 键 词：斜风 三塔斜拉桥 动力特性 空气静力稳定性 空气动力稳定性 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]