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原文传递 Experimental Study of Sliding Hydromagnetic Isolators for Seismic Protection

题名：	Experimental Study of Sliding Hydromagnetic Isolators for Seismic Protection
正文语种：	英文
作者：	Yongbo Peng1; Luchuan Ding2; Jianbing Chen, Aff.M.ASCE3; Roberto Villaverde4
作者单位：	1Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China; Professor, Shanghai Institute of Disaster Prevention and Relief, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China. 2Graduate Student, Dept. of Structural Engineering, Ghent Univ., Technologiepark Zwijnaarde 904, 9052 Zwijnaarde, Ghent, Belgium; Graduate Student, College of Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China. 3Professor, State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China; Professor,College of Civil Engineering, Tongji Univ., 1239 Siping Rd., Shanghai 200092, China (corresponding author). 4Professor Emeritus, Dept. of Civil and Environmental Engineering, Univ. of California, Irvine, CA 92697.
关键词：	Sliding hydromagnetic bearing; Quasi-static test; Repulsive force; Damping force; Coefficients of friction; Oil pressure
摘要：	Sliding isolation, as one of the modalities of base isolation, has demonstrated its value in seismic hazard mitigation. Conventional sliding isolation systems, however, may exhibit unacceptable large sliding displacements under severe earthquakes and may suffer a risk of unpredictable impact effect due to the insufficient isolation gap. A novel base isolation system that uses sliding hydromagnetic bearings has been proposed recently to overcome these shortcomings. These bearings comprise steel tubes with a pressurized internal fluid and attached permanent magnets, and slide over aluminum base plates also with attached permanent magnets. They minimize the friction between bearings and base plates, generate a damping force that reduces the bearings displacements to practical levels, and introduce a restoring force and a displacement constraint. In the present study, a sliding hydromagnetic isolator is designed, fabricated, and tested experimentally to assess its performance as a seismic protection system. Additionally, numerical simulations are carried out for quantifying the repulsive, damping, and friction forces involved. It is found from these studies that the applied loads on the hydromagnetic bearing does not produce fluid leakages, O-ring damage, or scratch marks on the base plates; the bearing’s friction coefficient does not exhibit a conventional friction-vertical load correlation and is therefore lower and more stable than in existing sliding isolators due to the effect of oil-solid interface; and the pressurized fluid significantly reduces the frictional force between bearing and base plate and facilitate thus the bearing’s sliding; the repulsive force increases dramatically with the bearing displacement and may effectively prevent bearings from sliding off their base plates.
出版年：	2019
期刊名称：	Journal of Structural Engineering
卷：	145
期：	5
页码：	1-13