新型自复位黏弹性阻尼支撑力学性能研究  

THE INVESTIGATION ON MECHANICAL BEHAVIOR OF A NEW-TYPE SELF-CENTERING VISCOELASTIC DAMPING BRACE

作　　者：韩建平[1,2] 章全才 HAN Jian-ping;ZHANG Quan-cai(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Institute of Earthquake Protection and Disaster Mitigation,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《工程力学》2021年第1期195-204,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51578273);教育部长江学者和创新团队发展计划项目(IRT_17R51)。

摘　　要：提出了一种新型的自复位黏弹性阻尼支撑(self-centering viscoelastic damping brace,SCVEDB),该支撑利用形状记忆合金的拉伸变形和黏弹性材料的剪切变形共同耗散能量,同时利用形状记忆合金的超弹性特性复位。设计和加工了SCVEDB最基本的模型,对该支撑试件进行了循环往复荷载作用下的力学性能试验,研究了位移幅值、加载速率、SMA丝数量、黏弹性材料的厚度对其性能的影响,同时通过割线刚度、耗散能量、等效阻尼比、自复位比4个参数量化分析了SCVEDB的力学性能。对SMA丝进行了循环拉伸试验,利用OpenSees平台建立了SMA的材料本构数值模型,然后将其与模拟黏弹性材料的Bouc-Wen模型并联,建立了该支撑的力学模型,进而模拟了支撑的力学性能,数值模拟结果与试验结果吻合较好。A new-type self-centering viscoelastic damping brace(SCVEDB)is proposed,in which the tensile deformation of shape memory alloy(SMA)and the shear deformation of viscoelastic material(VEM)are used to dissipate energy together,and the superelastic property of SMA is used to recenter.The most basic model of this new-type SCVEDB was designed and fabricated.The mechanical properties of the SCVEDB specimen under cyclic loading were tested.The effects of displacement amplitude,loading rate,number of SMA wires,and thickness of VEM on the performance of SCVEDB were investigated.The four parameters such as secant stiffness,dissipated energy,equivalent damping ratio and self-centering ratio are adopted to quantify the mechanical properties of SCVEDB.The cyclic tensile loading tests of SMA wires are also conducted to validate the proposed numerical model for SMA via OpenSees platform.And this model is paralleled further with the Bouc-Wen model for VEM to build the mechanical model to simulate the mechanical properties of the SCVEDB numerically.The numerical simulation results agree well with the experimental ones.

关 键 词：自复位黏弹性阻尼支撑 SMA 超弹性 黏弹性材料 力学试验 数值模拟 

分 类 号：TU352.1[建筑科学—结构工程]