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Wind and Structures Volume 39, Number 5, November 2024 , pages 367-380 DOI: https://doi.org/10.12989/was.2024.39.5.367 |
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Study on wind stability and favorable structural scheme of a three-tower cable-stayed bridge |
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Xinjun Zhang, Binbin Ni and Tianjiao Zhao
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| Abstract | ||
| By using a computational procedure of three-dimensional aerostatic and aerodynamic stability analysis of long-span bridges, the dynamic characteristics, structural stability including the aerostatic and aerodynamic stability are firstly analyzed for a three-tower cable-stayed bridge with main spans of 1400 meters, the parametric analysis is then conducted, and finally a favorable structural scheme of the example bridge is proposed and confirmed numerically. The results show that long-span three-tower cable-stayed bridge has significant flexibility with less vertical and especially horizontal stiffness, and is sensitive to the transverse wind action; long-span three-tower cable-stayed bridge exhibits a coupled aerostatic instability mode of vertical bending and torsion; the aerodynamic stability is worse than the aerostatic stability for long-span three-tower cable-stayed bridge, the flutter critical wind speed is significantly reduced by the static wind action, and thus the aerostatic effect must be involved in the aerodynamic stability analysis; the best wind stability is obtained for the example bridge as 2 auxiliary piers are set in each side span and their centerline differs from the side piers by 0.4 times the side span length, the center-to-side tower height ratio is 1.3, the tower height-to-span ratio is 1/5, 4 pairs of crossing cables are set at midspan of main spans, and the girder depth is 5.0 m. | ||
| Key Words | ||
| aerodynamic stability; aerostatic stability; design parameter; dynamic characteristics; favorable structural scheme; long-span three-tower cable-stayed bridge | ||
| 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 Binbin Ni:College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, P.R. China Tianjiao Zhao:College of Civil Engineering, Zhejiang University of Technology, Hangzhou, 310023, P.R. China | ||