自复位放大位移型SMA阻尼器优化设计方法研究

该文利用形状记忆合金（SMA）的超弹特性提出了一种新型自复位放大位移型SMA阻尼器（re-centeringdeformation-amplified SMA damper，RDASD）。该阻尼器可将位移变形根据实际工程需要进行放大，通过限制放大以后的位移充分发挥SMA材料的耗能能力。首先建立了该阻尼器的恢复力模型，并通过试验进行了验证。基于SMA材料的旗帜型恢复力模型，分析了预变形、超弹性拉伸位移、刚度和长度四个参数对该阻尼器耗能系数的影响规律。为实现最佳耗能和减震控制效果，提出了该阻尼器的设计准则和性能优化方法。最后以某三层钢框架结构为例，分析了有控和无控两种工况下结构在地震动作用下的动力响应，验证了该阻尼器的减震效果。

OPTIMUM DESIGN OF A RE-CENTERING DEFORMATION-AMPLIFIED SMA DAMPER

This paper presents an innovative re-centering deformation-amplified shape memory alloy (SMA) damper (RDASD) by utilizing the superelastic property of SMA materials. The damper can amplify the displacement deformation according to practical engineering requirements and then fully exploit the energy dissipation capacity of the superelastic SMA materials by restricting the amplified displacement. A theoretical model of the RDASD was proposed and then cyclic tensile-compressive tests were conducted to verify the accuracy of the model. Based on the flag force-restoring model of the SMA material, the influences of pre-deformation, superelastic displacement, stiffness and length of the SMA wires on the energy dissipation coefficient of the damper were analyzed. To achieve optimal energy consumption and seismic control effect, the design criterion and performance optimization method of the damper were presented. Finally, time-history analysis with and without this damper on a 3-layer steel frame was presented, which validated the control effect of the damper.