铁道科学与工程学报2025，Vol.22Issue(3)：1165-1176,12.DOI:10.19713/j.cnki.43-1423/u.T20240764
大跨斜拉桥抖振响应简化分析方法及试验验证
Simplified analysis method and experimental verification for buffeting response of long-span cable-stayed bridge
摘要
Abstract
Analysis of buffeting response in long-span cable-stayed bridges is a critical aspect of wind-resistant design.Typically,wind tunnel tests and finite element analysis are used for this purpose.However,defining the aerodynamic stiffness and damping matrices in finite element analysis leads to significantly increased computation time with an increase in the number of structural elements.To enhance the efficiency of finite element analysis for buffeting response,this article proposed a simplified approach and validates its effectiveness through numerical simulations and a full-bridge aeroelastic model wind tunnel test.Firstly,a simplified model was developed where aerodynamic stiffness was neglected.The erodynamic damping was considered through additional modal damping ratios.Dynamic response calculations were then performed using modal superposition to reduce computational complexity.Subsequently,the proposed method was validated through comparative analysis with numerical simulations and a full-bridge aeroelastic model wind tunnel test.The results demonstrate that at a designed wind speed of 32.3 m/s in the completed bridge state with a 0° angle of attack,the root-mean-square value of vertical buffeting displacements at mid-span and quarter-span position measured in wind tunnel tests are 39.6 mm and 21.1 mm,respectively,while the numerical simulation results are 40.7 mm and 21.6 mm.The relative errors are 2.78%and 2.37%,respectively.The comparative analysis indicates that the buffeting responses obtained from numerical simulations closely match the wind tunnel test results,affirming the effectiveness and reliability of the proposed method.Therefore,in the analysis of buffeting response in long-span cable-stayed bridges,a simplified finite element analysis approach can be adopted by neglecting the aerodynamic stiffness matrix and considering aerodynamic damping through additional modal damping ratios to improve computational efficiency.This calculation method can greatly simplify the analysis complexity and is well-suited for practical engineering needs.关键词
抖振响应/有限元分析/气动阻尼/模态阻尼比/计算效率Key words
buffeting response/finite element analysis/aerodynamic damping/modal damping ratios/computational efficiency分类
交通工程引用本文复制引用
甘泽鹏,邓佳逸,吴庆,张吉仁,曹楠奎,封周权,华旭刚,牛华伟..大跨斜拉桥抖振响应简化分析方法及试验验证[J].铁道科学与工程学报,2025,22(3):1165-1176,12.基金项目
重庆市自然科学基金项目(2022NSCQ-MSX5727) （2022NSCQ-MSX5727）
智慧城市物联网国家重点实验室(澳门大学)开放课题(SKL-IoTSC(UM)-2021-2023/ORP/GA09/2022) （澳门大学）
