人群荷载下大型火车站房大跨楼盖振动舒适度控制研究  

Vibration serviceability control of a long-span floor in large station room under crowd-induced excitation

作　　者：操礼林[1,2] 李爱群[1] 陈鑫[1] 张志强[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]江苏大学,江苏镇江212013

出　　处：《土木工程学报》2010年第S1期334-340,共7页China Civil Engineering Journal

基　　金：国家"十一五"科技支撑项目(2006BAJ03A04)

摘　　要：大型火车站房动力特性复杂,其大跨楼盖在人群荷载激励下容易产生较大振动。通过建立某大型火车站房的整体有限元模型,研究这类建筑中大跨楼盖的振动特性;随后对楼盖在各种不利工况人群荷载作用下的振动舒适度进行分析,重点研究人群荷载的模拟方法;进而在已有研究的基础上,提出在大跨楼盖上布置多组不同参数TMD(MTMD)的振动控制方法。根据大型火车站房的动力特性,对减振系统的布置位置以及参数设置提出实用的设计方法,其中各TMD的自振频率需要结合结构竖向自振频率以及人群荷载的激励频率来确定。工程实例的减振分析结果表明,设置MTMD系统并合理选取其参数后,人群荷载激励下楼板的竖向振动均可以得到较好的抑制,平均减振效果可以达到34.5%,从而使结构在使用时满足人体舒适度的要求。研究工作对同类大跨度楼盖的振动舒适度的分析和控制系统的设计具有重要参考价值。The dynamic characteristic of the large station room is complicated and the crowd-induced excitation can cause large vibration of floor.A three-dimensional finite element model of a large station room was set up,and the vibration properties of the long-span floors in this structure were studied.The vibration serviceability of the floor structure in several disadvantageous cases of crowd-induced excitation was analyzed and more concerns were given to the method of modeling crowd-induced loads.Based on the current research results,the vibration controlling method,which involves several sets of multiple tuned mass dampers(MTMD) with different parameters laid on the large-span floor,was proposed.According to the dynamic properties of the large station room,the applicable design method to determine locations and parameters of dampers was presented,in which the natural frequency of each single tuned mass damper can be determined by the structure vertical natural frequencies and the frequencies of crowd-induced loads.Analysis results of an engineering example show that this method can effectively reduce the floor vertical vibration of the large station structure under crowd-induced loads by 34.5% on the average,which makes the requirement of body serviceability to be easily met.The research work in this paper has important reference value to the vibration serviceability analysis of the same kind of large span floor and the design of vibration control system.

关 键 词：人群荷载 大型火车站房 大跨度楼盖 振动控制 舒适度 多重调谐质量阻尼器 

分 类 号：TU352.11[建筑科学—结构工程]