人行桥阻尼索减振研究  

A study on vibration control of a footbridge by damping cables

作　　者：彭文林 禹见达[1,2] 胡磊 孙洪鑫[1,2] PENG Wenlin;YU Jianda;HU Lei;SUN Hongxin(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Provincial Key Laboratory of Structures for Wind Resistance and Vibration Control,Hunan University of Sience and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]湖南科技大学,结构抗风与振动控制湖南省重点实验室,湖南湘潭411201

出　　处：《振动与冲击》2023年第4期256-262,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(52278307);湖南省杰出青年基金(2021JJ10003);湖南省自然科学基金(2022JJ30261)。

摘　　要：随着人行桥跨度不断增加,其固有频率受行人质量的影响增大,为提高人行桥的宽频减振效果,提出了一种由阻尼器、复位弹簧并联后再与拉索串联而成的阻尼索减振方法。首先,以简支梁模拟人行桥,建立了阻尼索-人行桥弯曲振动方程,采用解析法获得了阻尼索为人行桥提供的附加阻尼比计算公式。然后,通过模型试验分析了桥梁频率、阻尼器黏性系数等参数变化时阻尼索为桥梁提供的附加阻尼比变化规律。研究结果表明,阻尼索可为人行桥提供非常大的附加阻尼比,附加阻尼比理论计算公式与试验结果吻合。最后,基于附加阻尼比理论计算公式,对阻尼索减振性能进行了参数影响分析。With the increasing span of footbridges, the pedestrian quality has a greater impact on the natural frequency of the footbridges. In order to improve the effect of broadband frequency vibration reduction for a footbridge, a new vibration reduction approach called damping cable was proposed, which composes of a damper and a return spring in parallel and is connected in series with the cable. Firstly, the footbridge was simplified as a simply supported beam, the bending vibration equation of the footbridge with damping cable was established, and the calculation formula of the additional damping ratio provided by the damping cable for the pedestrian bridge was obtained by an analytical method. Then, through the model experiment, the variation laws of the additional damping ratio provided by the damping cable for the bridge was analyzed when the parameters such as the frequency of the footbridge and the damping coefficient were changed. 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 the footbridge was analyzed.

关 键 词：桥梁减振 人行桥 振动控制 阻尼索 

分 类 号：TU973.2[建筑科学—结构工程] TU317.1