Performance evaluation of an eddy-current tuned mass damper for seismic protection using shaking table tests
Tuned mass dampers(TMDs)have been widely used in high-rise buildings for suppressing environmentally-induced vibration due to wind or earthquakes.Typically,supplemental damping mechanisms are adopted for these dampers to optimally reduce such type of vibration.Most of the practices rely on viscous dampers,which inherently exhibit potential disadvantages that might affect the long-term performance of a TMD system.For example,the viscous damper can only provide single-directional forces to the TMD,which will limit the controllability of the damper to the motion of the TMD system.In addition,repetitive and excessive frictions from mechanical contact among the shaft,the bearings and the casing of the viscous dampers might cause degradation of control performance and longterm maintenance problem to the TMD system.Recently,eddy-current-based tuned mass dampers(ECTMDs)have been developed to cope with these problems.The EC-TMD,which relies on the generation of eddy current from the relative movement between magnets and conductive plate,can provide a non-contact,planar damping mechanism to the TMD system.In this study,the seismic control performance of a small-scale prototype EC-TMD is experimentally investigated on a single-degree-of-freedom structure.A series of shaking table tests are conducted to evaluate the control performances of the EC-TMD system.Results obtained show that the proposed ECTMD system can notably increase equivalent damping of structure and reduce earthquake-induced acceleration of the structure by approximately 5%~20%.
eddy-current-based tuned mass damper seismic mitigations vibration control performance shaking table tests
Zhiguo Shi Cheng Ning Loong Yidi Tan Chih-Chen Chang Jiazeng Shan
Research Institute of Structural Engineering and Disaster Reduction,Tongji University,No.1239 Siping Department of Civil and Environmental Engineering,the Hong Kong University of Science and Technology
国际会议
The 7th World Conference on Structural Control and Monitoring(7WCSCM)(第七届结构控制与监测世界大会)
青岛
英文
591-600
2018-07-22（万方平台首次上网日期，不代表论文的发表时间）