曲梁人行天桥的人致振动舒适度与减振研究  

Research on human-induced vibration comfort and vibration reduction of curve-beam footbridge

作　　者：王佳 Wang Jia(Chengdu Branch,SEEDRI,Chengdu Sichuan 610000,China)

机构地区：[1]上海电子工程设计研究院有限公司成都分院,四川成都610000

出　　处：《山西建筑》2024年第16期167-170,共4页Shanxi Architecture

摘　　要：基于有限元分析软件,建立某工程实例中人行天桥的时程分析模型,根据其自振特性结果确立荷载工况,分析了人行天桥在行人荷载下的竖向振动加速度。通过时程分析得出人行桥主梁各点在人致振动下的竖向加速度响应时程曲线,再对其进行舒适度评价。结果表明:主梁主跨和边跨部分节点存在加速度大于限值的情况,最大可达58.76 cm/s 2,需要进行舒适度分析。针对问题工况,分别在边中跨布置TMD减振系统后再次进行时程分析,主梁峰值加速度减小至40.34 cm/s 2,其结果表明人行天桥舒适度满足要求,减振效率至少可达27.89%。Based on FEA analytical software,a time-history analysis model of a footbridge project example is built and some load cases is established to analyse its vertical vibration acceleration under the pedestrian loads according to its dynamic properties.Through time-history analysis,vertical acceleration response time-history curve of each position of the main beam under the human-induced vibration is gotten to evaluate the comfort level.The results show that comfort level analysis needs to be carried out for excessive acceleration appears in some nodes of the beam’s primary span and side span with the acceleration of 58.76 cm/s^(2) maximum.For some critical load cases,time-history analysis is operated again after adding TMD vibration control system on the footbridge,with the peak acceleration of 40.34 cm/s^(2),which suggests that the comfort level meets the demand with the minimum vibration-reduction efficiency of 27.89%.

关 键 词：人行天桥 人致振动 有限元模型 TMD减振系统 

分 类 号：TU997[建筑科学—市政工程] U441.3[建筑科学—桥梁与隧道工程]