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Design and analysis of an innovative hybrid shape memory alloys viscous damper

ZHAO Xiang;LIU Zhonghua;WANG Sheliang;YANG Tao;ZHAN Meng;College of Civil Engineering,Xi'an University of Architecture and Technology;  
Through superelasticity and hysteretic energy dissipation properties of shape memory alloy,an innovative hybrid shape memory alloy viscous damper(HSMAVD) which possesses large energy dissipation,displacement amplifying function and re-centering capabilities,is proposed.Cyclic tension-compression behavior of the hybrid shape memory alloy viscous damper has been tested.Based on the improved Graesser Cozzarelli constitutive equation and mechanical model of viscous damper,the restoring force model of hybrid shape memory alloys viscous damper is established,which are utilized to simulate the cyclic performance of the hybrid shape memory alloys viscous damper.The results show that shape memory alloy and viscous liquid in the compositive damper have a good ability to work together and can effectively make use of the super-elastic of the shape memory alloy and velocity-dependent of viscous damper.The HSMSVD has both stable hysteretic behavior and well energy dissipation capacity.The numerical results agree well with the experimental data,showing the validity of the proposed restoring model of the hybrid shape memory alloys viscous damper.The correctness of the proposed restoring force model is verified.There is a reference value for the similar damper design.
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