某异形拱人行桥通行舒适度及其控制研究

Research on comfort and traffic control of a shaped arch footbridge

综合对比了国内外规范对于人行桥通行舒适度的规定,并以一座异形拱人行桥为研究背景,利用大型通用有限元分析软件Midas civil建立背景工程的有限元模型;参考德国人行桥设计规范中的舒适度评价方法对人行桥进行舒适度评价,并利用调谐质量阻尼器对人行桥进行减振设计.通过对背景工程进行舒适度评价和减振设计,得到一些实用设计分析有益的结果,分析结果表明:本工程在一般的正常使用情况下振动舒适性满足要求;当桥面上行人密度过大,行人交通荷载繁忙的极端状况下时,振动舒适性不能满足要求;采用TMD消能减振装置后,桥梁结构的动力响应均达到建议的峰值加速度范围以内,满足振动舒适性要求.

The traffic comfort regulations of footbridges at home and abroad are comprehensively compared.With a shaped arch footbridge as the research background,the finite element software Midas civil/2013 is used to establish a finite element model of this footbridge.The comfort evaluation method for bridge design specifications of German is adopted to evaluate the traffic comfort of the footbridgeand the tuned mass damper is used for the vibration reduction of footbridge.By analyzing the comfort evaluation and vibration design of the footbridge,some beneficial results in practical design and analysis are obtained.The analytical results show that this project meet the requirements of vibration comfort in normal use.The requirements of vibration comfort will not satisfied when the pedestrian density on the deck is too large or the pedestrian traffic load is extremely busy.By using the TMD energy dissipation device,the dynamic response of the bridge is within the range of the peak acceleration,which meets the requirements of vibration comfort.