考虑人体舒适度的大跨度悬挂结构振动控制研究  

VIBRATION CONTROL OF A LONG-SPAN SUSPENDED STRUCTURE CONSIDERING HUMAN COMFORT

作　　者：徐庆阳[1] 李爱群[1] 张志强[1] 丁幼亮[1] 

机构地区：[1]东南大学土木工程学院,东南大学混凝土与预应力混凝土结构教育部重点实验室,南京210096

出　　处：《振动与冲击》2008年第4期139-142,共4页Journal of Vibration and Shock

摘　　要：大跨度悬挂结构动力特性复杂,悬挂楼板在人行荷载激励下容易产生较大振动。在研究某大跨度悬挂结构自振特性的基础上,针对大跨度悬挂结构在不同工况人行荷载激励下楼板的竖向振动,提出了在悬挂楼板上布置多组不同参数TMD(MTMD)的振动控制方法。根据大跨悬挂结构的动力特性,对减振系统的布置位置以及参数设置提出了实用的设计方法,其中各TMD的自振频率需要结合结构竖向自振频率以及人行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,快、慢走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20%,从而使结构在使用时满足人体舒适度的要求。在实际工程应用前需要对实际结构进行动力特性测试来减小各种因素可能带来的误差。The dynamic characteristic of a long-span suspended structure is complicated and the walking load will cause bigger vibration of floor.Based on dynamic characteristic study of a long-span suspension structure,several sets of multiple tuned mass dampers(MTMD) are put forward to control the vertical vibration of the long-span suspension structure under pedestrian excitation.The applicable design method for setting locations and parameters of dampers is presented.The natural frequency of each single tuned mass damper can be determined with the structure vertical natural frequencies and the frequencies of pedestrian excitation.Analysis results of an engineering example prove that this method can effectively reduce the floor vertical vibration of the long-span suspension structure under fast walk and slow walk excitations.The average vibration reduction efficiency can reach 20% and the human comfort request under pedestrian excitation is satisfied.

关 键 词：大跨悬挂结构 人行荷载 振动控制 

分 类 号：TU351[建筑科学—结构工程]