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，评估了桥梁中常规耗能部件的抗震性能，包括屈服钢阻尼器、摩擦阻尼器、粘滞阻尼器和滑动弹性支座。确定了此类耗散组件在残余位移/变形方面的缺陷。结果表明，常规耗能构件具有较大的滞回特性，能有效地耗散地震能量，但会产生过大的残余位移，不利于桥梁的震后性能。因此，将SMA作为关键的自定心构件纳入传统的耗能构件，对提高桥梁的地震恢复力至关重要。

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.