大跨径人行桥人致振动舒适度分析

Analysis for Comfort of Pedestrian-induced Vibration on Large-span Pedestrian Bridges

对于大跨径轻柔桥梁结构,在行人激励之下更容易发生大幅振动,引起舒适度问题。依托国内某大跨径人行桥,参考国外人行桥设计指南,通过有限元时程分析方法,计算获得不同荷载激励下结构最大加速度响应时程曲线,进行行人振动舒适度评价。另外,针对不同模态设计相应的TMD减振系统,并进行减振效果分析。

Large - span soft bridge structures under motivationof pedestrians are more vulnerable to large vibration to causecomfort problem. Dependent on a domestic large - span pedestrianbridge and by reference to foreign guide for design of pedestrianbridges, this paper calculates and obtains the maximum accelerationresponse time - history curve of structures under motivationof different loads by means of finite element time - historyanalysis method to evaluate comfort under pedestrian vibration.In addition, the paper designs corresponding TMD vibrationdamping systems against different modes and analyzes dampingeffect.