长沙南站大跨度候车厅楼盖竖向舒适度分析与检测

Analysis and test on the comfort of the large-span waiting hall floor in South Changsha Railway Station

长沙南站高架候车厅层跨度为49m的大跨度钢桁架高跨比为1/20,在站场范围内的高架候车厅层楼盖柱与站场铁路桥梁的桥墩相连,包括与铁路正线通过桥梁的桥墩相连。对站场正线通过列车车振和高架层人行荷载所致的高架层49m跨楼盖竖向舒适度进行分析与研究,提出了候车厅楼盖舒适度的评价标准和分析方法,采用多点TMD-粘滞流体阻尼器消能减振系统对高架层大跨度楼盖进行减振分析与设计。理论分析和大量的现场检测表明:通过采用适当的结构措施,正线通过车致振动下高架层49m跨楼盖舒适度在减振前就满足要求;TMD减振系统有效地改善了楼盖的竖向舒适度,减振前在某些人行荷载下楼盖不满足舒适度要求,采用TMD减振后楼盖舒适度均满足设计要求,具有良好的经济性。

The ratio of height to span for steel truss with span of 49m is 1/20 in South Changsha Railway Station,and the columns for the waiting hall floor,which is just above the bridge structure on the 1st floor（also called platform floor）,are connected to the bridge piers,including the piers of the bridges for the high speed pass-by trains.The comfort of the large-span waiting hall floor induced by high speed pass-by trains on the platform floor and by human on the waiting hall was researched.The analysis method and standard of the comfort on railway waiting hall were also introduced hereby.Multipoint TMD-fluid viscous dampers were used in the large-span steel truss,and corresponding analysis and design of floor vibration,together with lots of the test-in-situ,were carried out.The analysis and tests indicate that without TMD,the comfort on 49m-span floor induced by high speed pass-by trains meets with the standard by taking suitable structural measures,while the comfort does not meet with the standard in some human-induced load cases.The comfort is effectively improved and meets with standard in all human-induced load cases by use of TMD.TMD vibration decreasing system is economical and can be applied to the similar large-span steel structures.