对一种直径1 mm 的国产NiTi 丝进行了超弹性性能试验，发现该NiTi 丝在常温下具有良好的超弹性．以该超弹性丝为材料，提出了一种新型形状记忆合金( SMA) 自复位阻尼器的构造，探讨了其工作原理．然后，采用Matlab 模拟了该阻尼器的滞回曲线，发现滞回曲线呈双旗形．最后，将该阻尼器安装在一单层钢框架模型上进行动力时程分析，结果表明该阻尼器可以有效耗散地震能量，减小结构的位移响应，其减震率达52%，并且对结构加速度反应也有一定的控制作用．

In this paper,first,the superelastic property of a domestic NiTi wire being 1mm in diameter was tested,and excellent superelasticity of the wire at room temperature was revealed. Then,by taking the wire as the material,a novel self-centering SMA ( Shape Memory Alloy) damper was proposed,with its structure and working principle being also introduced. Moreover,a double-flag hysteretic curve of the damper was found from the simulation with Matlab. Finally,a dynamic time-history analysis of a one-story steel frame fixed with the SMA damper was carried out, The results indicate that the proposed SMA damper effectively suppresses structural displacement response by 52% and controls the structural acceleration response to a certain degree.