This study introduces a shape memory alloy (SMA)-spring damper which is composed of SMA bars and elastic springs arranged in perpendicular. The damper depicts a curved flag-shape hysteretic behavior that is endowed with self-centering capacities and large deformation capabilities but uses reduced amount of SMA material. A design procedure is proposed to apply the SMA-spring damper to the bridge with laminated rubber bearings which would slide under seismic excitations. Analytical results validate the effectiveness of SMA-spring dampers in seismic control of the bridge: (1) The damper provides trivial stiffness to the bridge at small displacement, and the isolation efficiency of the bridge is maintained; (2) large horizontal force is provided for the structures at large deformation of the bearings, which alleviates the excessive displacement of bearings and prevents span collapse; and (3) the damper helps recenter the bearings and reduce the residual displacement of the bridge.

本研究介绍了一种形状记忆合金 (SMA) 弹簧阻尼器，它由垂直排列的 SMA 杆和弹性弹簧组成。阻尼器描绘了一种弯曲的旗形滞后行为，具有自定心能力和大变形能力，但使用了少量的 SMA 材料。提出了一种设计程序，将 SMA 弹簧阻尼器应用于带有层压橡胶支座的桥梁，该支座会在地震激发下滑动。分析结果验证了 SMA 弹簧阻尼器在桥梁抗震控制中的有效性： (1) 阻尼器在小位移时为桥梁提供微刚度，保持桥梁的隔震效率；(2)支座变形较大的结构提供较大的水平力，减轻支座位移过大，防止跨度坍塌；(3)阻尼器有助于轴承对中，减少桥梁的残余位移。