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Wind and Structures Volume 38, Number 1, January 2024 , pages 43-58 DOI: https://doi.org/10.12989/was.2024.38.1.043 |
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Investigation on flutter stability of three-tower suspension bridges under skew wind |
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Xinjun Zhang, Xuan-Rui Pan, Yuhan Leng and Bingze Chen
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| Abstract | ||
| To ensure the flutter stability of three-tower suspension bridges under skew wind, by using the computational procedure of 3D refined flutter analysis of long-span bridges under skew wind, in which structural nonlinearity, the static wind action(also known as the aerostatic effect) and the full-mode coupling effect etc., are fully considered, the flutter stability of a three-tower suspension bridge-the Taizhou Bridge over the Yangtze River in completion and during the deck erection is numerically investigated under the constant uniform skew wind, and the influences of skew wind and aerostatic effects on the flutter stability of the bridge under the service and construction conditions are assessed. The results show that the flutter critical wind speeds of three-tower suspension bridge under service and construction conditions fluctuate with the increase of wind yaw angle instead of a monotonous cosine rule as the decomposition method proposed, and reach the minimum mostly in the case of skew wind. Both the skew wind and aerostatic effects significantly reduce the flutter stability of three-tower suspension bridge under the service and construction conditions, and the combined skew wind and aerostatic effects further deteriorate the flutter stability. Both the skew wind and aerostatic effects do not change the evolution of flutter stability of the bridge during the deck erection, and compared to the service condition, they lead to a greater decrease of flutter critical wind speed of the bridge during deck erection, and the influence of the combined skew wind and aerostatic effects is more prominent. Therefore, the skew wind and aerostatic effects must be considered accurately in the flutter analysis of three-tower suspension bridges. | ||
| Key Words | ||
| aerostatic effect; deck erection; flutter stability; service condition; skew wind; three-tower suspension bridges | ||
| Address | ||
| Xinjun Zhang:1)College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, P.R. China 2)Key Laboratory of Civil Engineering Structures & Disaster Prevention and Mitigation Technology of Zhejiang Province, Hangzhou, 310023, P.R. China Xuan-Rui Pan, Yuhan Leng and Bingze Chen:College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, P.R. China | ||