上承式索道桥结构在大跨度人行玻璃桥中的适用性研究

Research on the Applicability of the Upper-supported Cableway Structure on the Large-span Glass Pedestrian Bridges

悬索桥是玻璃桥的主要结构形式,但其结构刚度小,在人群步伐下易发生较大振幅,影响舒适性及结构安全性。本文提出的上承式索道桥结构,较悬索桥具有结构刚度大、舒适性好的优点,且更适合玻璃桥面安装布置。为研究这类结构的人致振动特性,对一座已建该类桥梁进行现场动力测试,并与悬索桥进行对比。结果验证了该结构具有更大的竖向刚度,有利于减小桥梁人致振动响应;同时设计时需注重加强其扭转刚度,减少步伐荷载下结构整体扭转振幅。

Suspension bridge is the main structural form of glass bridge,but its structural stiffness is small and prone to large amplitude under the pace of the crowd,which affects the comfort and structural safety.In this paper,we propose a novel type of cableway footbridge with bridge deck upper-supported,which has the advantages of high structural stiffness and good comfort than suspension bridges,and is more suitable for glass deck installation arrangement.In order to study the human-induced vibration characteristics of this structure,field dynamic tests were conducted on a built bridge of this type and compared with a suspension bridge.The results verify that the structure has greater vertical stiffness,which helps to reduce the human-induced vibration response of the bridge;at the same time,the design should focus on strengthening the torsional stiffness to reduce the overall torsional amplitude of the structure under pace load.