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| A study on vibration control of a footbridge by damping cables |
| PENG Wenlin1 , YU Jianda1,2, HU Lei1, SUN Hongxin1,2 |
1.School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2.Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control, Hunan University of Sience and Technology, Xiangtan 411201, China |
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Abstract With the increasing span of the footbridge, the pedestrian quality has a greater impact on the natural frequency of the footbridge, in order to improve the effect of broadband frequency vibration reduction for footbridge, A new vibration reduction approach called damping cable is proposed, which composed of a damper and a return spring in parallel and then connected in series with the cable. Firstly, the footbridge is simplified as a simply supported beam, the bending vibration equation of footbridge with damping cable is established, and the calculation formula of the additional damping ratio provided by the damping cable for the pedestrian bridge is obtained by analytical method. Then, through the model experiment, the variation laws of the additional damping ratio provided by the damping cable for the bridge is analyzed when the parameters such as the frequency of the footbridge and the damping coefficient are changed. The results show that the damping cable can provide a very large additional damping ratio for the footbridge, and the theoretical calculation formula of the additional damping ratio is consistent with the experimental results. Finally, based on the theoretical formula of additional damping ratio, the influence of damping cable parameters on the vibration mitigation of footbridge is analyzed.
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Received: 23 August 2021
Published: 28 February 2023
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