钢结构人行桥TMD减振分析及测试

摘要

Steel structure pedestrian bridge under the impact of pedestrian load,will produce vertical vibration.Excessive vibration will not only cause comfort problems,but also may lead to structural safety problems.This article uses the Midas Gen software to analyze the dynamic response of a pedestrian bridge in Shanghai,and the vibration response of TMD system is verified by the structural vibration response of TMD system.And compared the structure vibration response before and after the optimization design of the TMD system installation.It verified that the TMD has good vibration damping effect.And we tested the dynamic response of the bridge contrast before and after the installation of TMD.The vibration effect of TMD was evaluated by the acceleration peak,the global root mean square value and the continuous root mean square value.%钢结构人行桥在人行荷载作用下,会产生竖向振动.过大的振动不但会引起舒适度问题,还可能引发结构的安全问题.本文采用Midas Gen软件对上海市某人行桥进行人行荷载激励下的动力响应分析,对比安装经优化设计的TMD系统前后的结构振动响应,验证了TMD良好的减振效果.并对该人行桥进行安装TMD前后的对比振动测试,用加速度峰值、整体均方根值和连续均方根值评价了TMD的减振作用.