Enhancing Seismic Resilience of Bridges by Using Novel Shape Memory Alloy (SMA) Devices Combined with Conventional Damping Mechanisms

作为本研究项目的第一阶段，对桥梁中常用耗能元件的抗震性能进行了评估，包括屈服钢耗能元件、摩擦阻尼器、粘滞阻尼器和滑动弹性支座。确定了这些耗散部件在残馀位移/变形方面的不足。结果表明，常规耗能构件表现出较大的滞回特性，具有较好的耗能效果，但会产生过大的残余位移，不利于桥梁的抗震性能。因此，将SMA作为关键的自中心构件加入到传统的耗散构件中，对于提高桥梁的抗震能力是至关重要的。

As the first stage of this research project, the seismic performance of conventional energy dissipation components in bridges was evaluated, including yielding steel dampers, friction dampers, and viscous dampers and sliding elastomeric bearings. The deficiencies of such dissipative components in terms of residual displacement/deformation were identified. The results indicate that conventional dissipative members are effective in dissipating seismic energy by displaying wide hysteresis, but result in excessive residual displacements that are unfavorable to post-earthquake performance of bridges. Therefore, the incorporation of SMAs as critical self-centering members to conventional dissipative members is essential to improve the seismic resilience of bridges.