A laminated magnetorheological elastomer bearing prototype for seismic mitigation of bridge superstructures

In this article, an adaptive magnetorheological elastomer bearing prototype for seismic mitigation of bridge superstructures is designed and manufactured. The magnetorheological elastomer bearing is developed featuring conventional laminated structure in the seismic rubber bearing. Besides, the magnetic circuit design of the laminated magnetorheological elastomer bearing is verified by electromagnetic analysis, and a base-isolated testing system is established to obtain the acceleration transmissibility under various applied currents. The experimental results indicate that the resonance frequency of the integrated system can be tuned from 10 to 20 Hz, and the transmissibility peak value reduces 20.67% simultaneously, for which the proposed bearing can be used for seismic mitigation. Finally, the stiffness and damping of the laminated magnetorheological elastomer bearing integrated vibration mitigation system are identified by the response characteristics.

[1]  G. Heppler,et al.  Experimental Research and Modeling of Magnetorheological Elastomers , 2004 .

[2]  Xinglong Gong,et al.  Fabrication and characterization of isotropic magnetorheological elastomers , 2005 .

[3]  Jeong-Hoi Koo,et al.  Application of MR Elastomers for Improving Seismic Protection of Base-Isolated Structures , 2011, IEEE Transactions on Magnetics.

[4]  John Matthew Ginder,et al.  Magnetorheological elastomers: properties and applications , 1999, Smart Structures.

[5]  Bijan Samali,et al.  Development and characterization of a magnetorheological elastomer based adaptive seismic isolator , 2013, Smart Materials and Structures.

[6]  Satish Nagarajaiah,et al.  Seismic response control of smart sliding isolated buildings using variable stiffness systems: an experimental and numerical study , 2006 .

[7]  Billie F. Spencer,et al.  Modeling and Control of Magnetorheological Dampers for Seismic Response Reduction , 1996 .

[8]  Faramarz Gordaninejad,et al.  Seismic Control of Base Isolated Structures Using Novel Magnetorheological Elastomeric Bearings , 2013 .

[9]  J. Carlson,et al.  A model of the behaviour of magnetorheological materials , 1996 .

[10]  Faramarz Gordaninejad,et al.  A new isolator for vibration control , 2011, Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[11]  Clarence W. de Silva,et al.  Vibration: Fundamentals and Practice , 1999 .

[12]  Miao Yu,et al.  A new magnetorheological elastomer isolator in shear - Compression mixed mode , 2013, 2013 IEEE/ASME International Conference on Advanced Intelligent Mechatronics.

[13]  Hyung-Jo Jung,et al.  A feasibility study on smart base isolation systems using magneto-rheological elastomers , 2009 .

[14]  Billie F. Spencer,et al.  “Smart” Base Isolation Strategies Employing Magnetorheological Dampers , 2002 .

[15]  Jeong-Hoi Koo,et al.  Seismic Performance Analysis of A Smart Base-isolation System Considering Dynamics of MR Elastomers , 2011 .

[16]  Shirley J. Dyke,et al.  Experimental verification of multiinput seismic control strategies for smart dampers , 2001 .

[17]  G. Zhou,et al.  Shear properties of a magnetorheological elastomer , 2003 .

[18]  Weihua Li,et al.  A highly adjustable magnetorheological elastomer base isolator for applications of real-time adaptive control , 2013 .

[19]  Erik A. Johnson,et al.  "SMART" BASE ISOLATION SYSTEMS , 2000 .

[20]  R. G. Tyler.  Rubber bearings in base-isolated structures―a summary paper , 1991 .