一种新型自复位SMA支撑的抗震性能试验研究  

EXPERIMENTRAL STUDY ON SEIMEIC PERFORMANCE FOR AN INNOVATIVE SELF-CENTERING SMA BRACE

作　　者：胡淑军[1,2] 顾琦 姜国青 熊进刚 HU Shu-jun;GU Qi;JIANG Guo-qing;XIONG Jin-gang(School of Civil Engineering and Architecture,Nanchang University,Nanchang,Jiangxi 330031,China;Jiangxi Provincial Engineering Laboratory of Nearly Zero Energy Building,Nanchang,Jiangxi 330031,China;Hongdu Construction Group Co.Ltd.,Nanchang,Jiangxi 330029,China)

机构地区：[1]南昌大学建筑工程学院,江西南昌330031 [2]江西省近零能耗建筑工程实验室,江西南昌330031 [3]洪都建设集团有限公司,江西南昌330029

出　　处：《工程力学》2021年第1期109-118,142,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(51768044,51908268,51968047);江西省博士后科研择优资助项目(2019KY57)。

摘　　要：有效提高支撑的延性和耗能能力以及减小支撑的残余变形,是提高建筑结构抗震性能和震后功能恢复能力的重要手段之一。该文基于形状记忆合金(SMA)的自复位性能和滑移螺杆摩擦耗能等思想,提出一种抗震性能良好和自复位能力强的新型自复位SMA支撑。对五个不带SMA的支撑和六个自复位SMA支撑进行低周往复加载试验研究,得到了支撑的滞回曲线、骨架曲线、割线刚度、耗能能力、承载能力和自复位能力等抗震性能指标。试验结果表明:所提出的自复位SMA支撑具有良好的耗能能力、承载能力、延性及自复位能力,整个试验过程中各板件未达到屈服,且SMA可复位至初始状态,无任何构件发生损伤;各自复位SMA支撑试件的滞回曲线均较饱满且大致呈现旗帜型,最大自复位率达到93.7%。所提出的自复位SMA支撑具有良好的抗震性能,可作为自复位阻尼器使用。During rare earthquake,the effective improvement of the ductility and energy dissipation capacity and reduction of residual deformation of a brace is currently in higher demand to ensure the seismic safety and seismic resilience capacity.Based on the ideals of shape memory alloy(SMA)and friction slip,an innovative selfcentering brace with low friction and SMA is developed,which has the advantage of good seismic performance,high self-centering capacity and zero damage.Low frequency cyclic tests were carried on five non-SMA brace specimens and six self-centering SMA brace specimens,thusly the hysteresis curves,skeleton curves,secant stiffness,energy dissipation capacity and self-centering ratio of these specimens can be investigated.The test results show that:the self-centering SMA braces proposed have excellent energy dissipation capacity,bearing capacity,ductility and self-centering capacity,while all the steel plates in the specimens remain elastic without any yielding during the test,and the SMA in the specimens can return to the initial state.In addition,hysteretic behavior of the brace can be idealized as a flag-shape with little residual deformation,and the self-centering ratio has reached 93.7%.Therefore,the innovative brace has excellent seismic performance,which can be used as a self-centering damper.

关 键 词：形状记忆合金 自复位 滞回曲线 割线刚度 抗震性能 

分 类 号：TG139.6[一般工业技术—材料科学与工程] TU352.11[金属学及工艺—合金]