【作者】 马斐； 张志强； 李爱群；

【Author】 Ma Fei 1,Zhang Zhiqiang1,2,Li Aiqun2(1 School of Civil Engineering,Southeast University,Nanjing 210096,China; 2 Southeast University,Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education,Nanjing 210096,China)

【机构】 东南大学土木工程学院； 东南大学混凝土及预应力混凝土结构教育部重点实验室；

【摘要】 针对大跨高空连廊的振动舒适度问题,建立了某高空连廊的整体有限元模型,采用Ritz向量法对结构进行了模态分析,研究了大跨连廊的振动特性。模态分析表明该连廊的第一阶振型即为竖向振型,且该竖向振型的频率与人快走的频率非常接近,因此在大量人群荷载激励下容易产生较大振动,引起舒适度问题。本文采用两种不同的人群荷载模拟模型,针对连廊在不同人群密度、不同行走频率的人群荷载激励下的竖向振动通过布置TMD进行竖向振动控制。按本文方法在连廊的合适部位设置TMD后,所有工况下加速度平均减振率达31%,加速度峰值均满足人体舒适度要求。在本工程中,采用TMD减振技术是一种经济、实用的方法,对结构起到了良好的振动控制作用。更多还原

【Abstract】 The vibration serviceability of long-span corridor is studied.A finite element model of a corridor is established,and the modal properties of the structure are analyzed by the Ritz vector method.Then the vibration properties are studied.It is showed that the first order mode of the large-span corridor is vertical vibration model and the frequency of this mode is close to man’s quick-walk frequency.Large vibration would be caused when crowds walked through the passageway.Two crowd load model are used in this paper,considered different person densities,different walking frequencies to analyze the vibration control with TMD at certain place in the passageway.Dynamical analysis and results show that the vibration energy dissipation can effectively reduce the resonance response.The mean ratio of vibration reduction rate comes up to 31% of all cases,which reaches the target of human comfort.The technology of vibration reduction using TMD is an economic and effective method in this project.更多还原