摘要
利用NiTi形状记忆合金(Shape Memory Alloy,简称SMA)的超弹性特性,开发了一种新型SMA叠层变刚度水平万向阻尼器,介绍了其基本构造和工作原理,建立了阻尼器恢复力计算模型并开展了滞回性能参数分析,研究了SMA张拉应变、SMA直径、阻尼器层数以及每层SMA丝根数对阻尼器行程、刚度、耗能、等效阻尼比的影响.研究结果表明:SMA叠层变刚度水平万向阻尼器的恢复力-位移滞回曲线呈饱满的纺锤形,阻尼器具有良好的能量耗散能力、自复位功能、大行程以及变刚度特性;随着SMA张拉应变由0.03不断增大至0.06,阻尼器最大行程不断减小而单位循环耗能呈先增大后减小趋势;随着SMA直径不断增大,阻尼器刚度和耗能能力不断增大而最大行程和等效阻尼比不变;随着叠层层数不断增大,阻尼器最大行程和单位循环耗能不断增加而刚度不断降低;随着每层SMA布置数量由8根增大至16和32根,阻尼器刚度和单位循环耗能不断增大而最大行程和等效阻尼比变化不明显.
Shape memory Alloy(SMA)is a new type of functional material,which presents special shape memory effect and superelastic properties.The damper developed using the superelastic properties of SMA usually possesses good energy dissipation and deformation recovery capacity,and has the significant advantages of strong deformation capacity as well as excellent resistance to high temperature,corrosion and fatigue.According to the technical requirements of vibration control for high-rise flexible structures,a new type of SMA laminated variable-stiffness horizontal universal damper was developed utilizing the superelastic properties of NiTi shape memory alloy wires.This study investigated the hysteretic behavior of the developed damper.The essential configuration and working mechanism of the damper were first introduced,and the calculation model of restoring force-displacement hysteretic curve of the damper was established.The parametric analysis was carried out,and the effects of pretensioning strain,diameter,number of SMA in each layer and number of layers on the hysteretic performance indices such as stroke,stiffness,energy dissipation and equivalent damping ratio of the damper were investigated.Results showed that the restoring force-displacement hysteretic curve of the damper presented a full spindle shape.The damper possessed excellent energy dissipation capacity,self resetting function,large stroke,and unique variablestiffness characteristics.The maximum stroke of the damper decreased continuously whereas the unit-cycle energy dissipation increased at first and decreased afterwards with the pretensioning strain of SMA wire increased from 0.03to 0.06.With the increase of SMA wire diameter,the stiffness and energy dissipation capacity of the damper increased whereas the maximum stroke and equivalent damping coefficient remained unchanged.The maximum stroke and unit-cycle energy consumption increased whereas the stiffness decreased continuously with the increase of the number of damper layers.With the number of SMA wires in each damper layer increased from 8to 16and 32,the stiffness and unit-cycle energy dissipation increased,but the change of the maximum stroke or equivalent damping coefficient was not obvious.The outcome of this study can provide meaningful references and essential data for the reliable application of SMA laminated variable-stiffness horizontal universal damper in the vibration control of high-rise flexible structures.
作者
李安邦
黄烜
聂彪
徐善华
Anbang Li;Xuan Huang;Biao Nie;Shanhua Xu(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,710055;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an,710055)
出处
《固体力学学报》
CAS
CSCD
北大核心
2023年第2期232-248,共17页
Chinese Journal of Solid Mechanics
基金
国家自然科学基金项目(52008331)
中国博士后科学基金(2021MD703867)
陕西省教育厅科学研究计划(21JS030)
陕西省重点研发计划(2022SF-467)资助
关键词
形状记忆合金
阻尼器
滞回性能
计算模型
参数分析
shape memory alloy
damper
hysteretic behavior
computational model
parametric study
作者简介
通讯作者:李安邦,E-mail:lianbang@xauat.edu.cn.
