Effects of non-stationary wind velocity models on buffeting performance of closed-box girder suspension bridges

Advances in Aerodynamics

Research

Peng Lu¹  Rui Zhou¹  Yinan Lin¹  Jinbo Zhu²  Yongxin Yang² 

[1] College of Civil and Transportation Engineering, Shenzhen University, 518060, Shenzhen, China;State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, 200092, Shanghai, China;

关键词: Suspension bridge;    Time-varying average wind velocity;    Uniform modulation function;    Non-uniform modulation function;    Non-stationary wind velocity;    Buffeting displacement response;   

DOI  :  10.1186/s42774-023-00158-w

 received in 2023-07-02, accepted in 2023-09-19,  发布年份 2023

来源: Springer

【 摘 要 】

Non-stationary characteristic in nature wind has a great effect on buffeting performance of long-span bridges. The influence of key parameters in non-stationary wind velocity models on nonlinear buffeting responses of a super long-span suspension bridge was investigated in this paper. Firstly, four non-stationary wind velocity models are established by combing the time-varying average wind velocity with an exponential function and the fluctuating wind velocity with four modulation functions, respectively. These non-stationary wind velocity models have obvious non-stationary characteristics and then are validated by the classical power spectrum densities. Finally, three displacement responses of the bridge deck under four different independent variables of β in the exponential function and four modulation functions were compared, respectively. Results show that the turbulence intensities using two non-uniform modulation functions (NMF) are larger than those using uniform modulation functions (uMF). Moreover, the root mean square (RMS) values of three displacement responses increase with the decrease of β. Besides, the RMS values of three displacement under two NMFs are larger than those under two uMFs, and their RMS values under the second uMF are the smallest.

【 授权许可】

CC BY   
© Chinese Aerodynamics Research Society 2023

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