Simplified analysis method and experimental verification for buffeting response of long-span cable-stayed bridge

被引：0

作者：

Gan, Zepeng ^{[1
,2
]}

Deng, Jiayi ^{[1
,2
]}

Wu, Qing ^{[3
]}

Zhang, Jiren ^{[1
,2
]}

Cao, Nankui ^{[1
,2
]}

Feng, Zhouquan ^{[1
,2
,4
]}

Hua, Xugang ^{[1
,2
]}

Niu, Huawei ^{[1
,2
]}

机构：

[1] State Key Laboratory of Bridge Safety and Resilience, Hunan University, Changsha

[2] Hunan Provincial Key Laboratory for Wind and Bridge Engineering, Hunan University, Changsha

[3] TY.Lin International Engineering Consulting (China) Co., Ltd, Chongqing

[4] Research Institute of Hunan University in Chongqing, Chongqing

来源：

Journal of Railway Science and Engineering | 2025年 / 22卷 / 03期

关键词：

aerodynamic damping; buffeting response; computational efficiency; finite element analysis; modal damping ratios;

D O I：

10.19713/j.cnki.43-1423/u.T20240764

中图分类号：

学科分类号：

摘要：

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. © 2025, Central South University Press. All rights reserved.

引用

页码：1165 / 1176

页数：11

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