摘要
Abstract
The vibration response of a suspended three-floor system under a long curved cantilevered truss is analyzed and controlled for comfort under the pedestrian loads.Midas Gen software was utilized to establish the global calculation model.Combined with the structural characteristics of the coordinated stress in suspended floor system and the building function,three conditions were selected by applying the free walking by crowd and the walking by the pedestrian stream in unit area on the suspended middle layer and all three suspended three layers.The analysis of the floor system vibration response shows that the selection of the excitation load,the number of the floors and the number of pedestrians have a significant effect on the peak acceleration of the vibration in the floor system.Furthermore,for the most unfavorable working excitation condition,the vibration damping measure of Multi-TMD was adopted.Based on the theoretical model of double degree freedom damper proposed by DEN HARTOG,and applying the induction method to obtain the first-order mode mass of the main structure,the optimal parameters of the damper were deduced.Finally,the two schemes of concentrating the damper at the end of the cantilever part and uniformly arranging the dampers at the curved cantilever part with the same total damper mass were compared.The results show that both schemes control the vibration response of the floor system effectively,and the scheme of concentrating the dampers at the end of the cantilever part is more efficient in damping the vibration.关键词
弧形悬挑/多层悬吊楼盖/人行荷载/振动响应/调频质量阻尼器/阻尼器最优参数Key words
curved cantilever/suspended multi-floor system/pedestrian load/vibration response/tuned mass damper/optimum damper parameter分类
建筑与水利
