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A platform for research: civil engineering, architecture and urbanism
Discrete viscous dampers for multi-mode vortex-induced vibration control of long-span suspension bridges
https://orcid.org/0000-0002-0480-8432
https://orcid.org/0000-0001-6150-2563
Abstract Multi-mode vertical vortex-induced vibrations have been observed on several long-span suspension bridges, where several vertical modes of stiffening girder are excited in turn with increasing of wind velocity. This paper proposed a discrete viscous dampers solution and its optimization targeting multi-mode vortex-induced vibration control for long-span suspension bridges. The minimal modal damping ratio was used to evaluate the performance of the damper system. The wind tunnel test verified that the modal damping ratio is an alternative to the resonance response amplitude and can be obtained by complex modal analysis. The ternary search algorithm was adopted to find the optimal damper parameter for the Yingwuzhou Yangtze River Bridge, which is a suspension bridge that suffered excessive vortex-induced vibrations. Using linear damper elements to connect the bridge tower and the bridge girder directly turned out to be a feasible method of increasing multiple modal damping ratios. Four torsional eddy current dampers have been installed in the Yingwuzhou Yangtze River Bridge, based on the numerical optimization results calculated in this paper. Although the measured modal damping ratios were smaller than the numerical results, the structural damping increased by three times after dampers were installed, and the requirement of the current specification was satisfied.
Highlights A discrete viscous dampers solution is proposed for multi-mode vortex-induced vibration control. The conception of choosing the optimal damper parameter is discussed. The modal damping ratio is an alternative to the resonance response amplitude. Ternary search algorithm was adopted in finding the optimal damper parameter. Solution was applied and verified in the Yingwuzhou Bridge.
Discrete viscous dampers for multi-mode vortex-induced vibration control of long-span suspension bridges
https://orcid.org/0000-0002-0480-8432
https://orcid.org/0000-0001-6150-2563
Abstract Multi-mode vertical vortex-induced vibrations have been observed on several long-span suspension bridges, where several vertical modes of stiffening girder are excited in turn with increasing of wind velocity. This paper proposed a discrete viscous dampers solution and its optimization targeting multi-mode vortex-induced vibration control for long-span suspension bridges. The minimal modal damping ratio was used to evaluate the performance of the damper system. The wind tunnel test verified that the modal damping ratio is an alternative to the resonance response amplitude and can be obtained by complex modal analysis. The ternary search algorithm was adopted to find the optimal damper parameter for the Yingwuzhou Yangtze River Bridge, which is a suspension bridge that suffered excessive vortex-induced vibrations. Using linear damper elements to connect the bridge tower and the bridge girder directly turned out to be a feasible method of increasing multiple modal damping ratios. Four torsional eddy current dampers have been installed in the Yingwuzhou Yangtze River Bridge, based on the numerical optimization results calculated in this paper. Although the measured modal damping ratios were smaller than the numerical results, the structural damping increased by three times after dampers were installed, and the requirement of the current specification was satisfied.
Highlights A discrete viscous dampers solution is proposed for multi-mode vortex-induced vibration control. The conception of choosing the optimal damper parameter is discussed. The modal damping ratio is an alternative to the resonance response amplitude. Ternary search algorithm was adopted in finding the optimal damper parameter. Solution was applied and verified in the Yingwuzhou Bridge.
Discrete viscous dampers for multi-mode vortex-induced vibration control of long-span suspension bridges
https://orcid.org/0000-0002-0480-8432
https://orcid.org/0000-0001-6150-2563
Abstract Multi-mode vertical vortex-induced vibrations have been observed on several long-span suspension bridges, where several vertical modes of stiffening girder are excited in turn with increasing of wind velocity. This paper proposed a discrete viscous dampers solution and its optimization targeting multi-mode vortex-induced vibration control for long-span suspension bridges. The minimal modal damping ratio was used to evaluate the performance of the damper system. The wind tunnel test verified that the modal damping ratio is an alternative to the resonance response amplitude and can be obtained by complex modal analysis. The ternary search algorithm was adopted to find the optimal damper parameter for the Yingwuzhou Yangtze River Bridge, which is a suspension bridge that suffered excessive vortex-induced vibrations. Using linear damper elements to connect the bridge tower and the bridge girder directly turned out to be a feasible method of increasing multiple modal damping ratios. Four torsional eddy current dampers have been installed in the Yingwuzhou Yangtze River Bridge, based on the numerical optimization results calculated in this paper. Although the measured modal damping ratios were smaller than the numerical results, the structural damping increased by three times after dampers were installed, and the requirement of the current specification was satisfied.
Highlights A discrete viscous dampers solution is proposed for multi-mode vortex-induced vibration control. The conception of choosing the optimal damper parameter is discussed. The modal damping ratio is an alternative to the resonance response amplitude. Ternary search algorithm was adopted in finding the optimal damper parameter. Solution was applied and verified in the Yingwuzhou Bridge.
Discrete viscous dampers for multi-mode vortex-induced vibration control of long-span suspension bridges
Cao, Yiwen (author) / Huang, Zhiwen (author) / Zhang, Hongyi (author) / Hua, Xugang (author) / Chen, Zhengqing (author) / Wan, Tianbao (author)
2023-11-17
Article (Journal)
Electronic Resource
English