单主缆悬索桥人致振动研究及减振控制

摘要

To provide references for the vibration mitigation control design of the suspension bridge with only one main cable,the Hechuanqu Landscape Bridge with a main span of 400 m was taken as the study background.The ANSYS was used to establish the finite element model of the bridge,to calculate the human-induced vibration on the bridge under the action of crowd loads and the running loads,taking into account of the influence of different loading density and ways of load application.The pedestrian comfort of the bridge was evaluated and based on which the tuned mass dampers(TMD)were designed to control the human-induced vibration of the bridge.The results of the study show that the values given by the Germany EN 03 pedestrian design handbook are rela-tively conservative.The calculation results of the equipollent crowd loads are bigger than those of the stochastic crowd loads.The human-induced vibration response under the action of running loads is big,which cannot meet the comfort demands of the pedestrian bridge.But when the TMD vibration mitigation system was added,the human-induced vibration response of the bridge has been under good control.%为给单主缆悬索桥的减振控制设计提供参考,以主跨400 m的合川渠江景观大桥为工程背景,建立了ANSYS有限元模型,在考虑了不同密度和加载方式的影响后,计算了人群荷载及跑步荷载作用下的桥梁人致振动,对其进行了舒适度评价,并在此基础上设计了调谐质量阻尼器(TMD)以控制该桥的人致振动.研究结果表明:德国EN03人行桥设计指南的计算结果偏于保守;等效人群荷载的计算结果大于随机人群荷载的计算结果;该桥在跑步荷载下的人致振动响应较大,不满足人行桥的舒适度要求,但在加设TMD减振系统后,该桥的人致振动响应得到很好的控制.