Lack of corrosion resistance and post-earthquake resilience will inevitably result in a considerable loss of function for concrete bridge piers with conventional steel reinforcement. As an alternative to steel reinforcement, shape memory alloy (SMA)-based reinforcing bars are emerging for improving the seismic performance of concrete bridge piers. This paper presents an assessment of concrete bridge piers with different reinforcement alternatives, namely steel reinforcement, steel-SMA hybrid reinforcement and SMA reinforcement. The bridge piers with different reinforcements are designed having a same lateral resistance, or in other words, the flexural capacities of plastic hinges are designed equal. Based on this, numerical studies are conducted to investigate the relative performance of different bridge piers under seismic loadings. Seismic responses in terms of the maximum drift, residual drift as well as dissipated energy are obtained and compared. The results show that all the three cases with different reinforcements exhibit similar maximum drifts for different earthquake magnitudes. The SMA-reinforced bridge pier has the smallest post-earthquake residual displacement and dissipated energy, whereas the steel-reinforced pier shows the opposite responses. The steel-SMA hybrid reinforcement can achieve a reasonable balance between the residual deformation and energy dissipation.

中文翻译：

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混合形状记忆合金 (SMA) 和钢筋加固混凝土桥墩的抗震性能

传统钢筋混凝土桥墩缺乏耐腐蚀性和震后恢复能力将不可避免地导致相当大的功能丧失。作为钢筋的替代品，基于形状记忆合金 (SMA) 的钢筋正在兴起，用于提高混凝土桥墩的抗震性能。本文介绍了对具有不同钢筋替代方案的混凝土桥墩的评估，即钢筋、钢-SMA 混合钢筋和 SMA 钢筋。不同配筋的桥墩设计为具有相同的侧向阻力，即塑性铰的抗弯能力设计相同。在此基础上，进行数值研究以研究不同桥墩在地震载荷下的相对性能。获得并比较了最大漂移、残余漂移以及耗散能量方面的地震响应。结果表明，对于不同的地震震级，具有不同加固物的所有三种情况都表现出相似的最大漂移。SMA 加固桥墩的震后残余位移和耗散能量最小，而钢加固桥墩的反应相反。钢-SMA混合增强可以在残余变形和能量耗散之间取得合理的平衡。SMA 加固桥墩的震后残余位移和耗散能量最小，而钢加固桥墩的反应相反。钢-SMA混合增强可以在残余变形和能量耗散之间取得合理的平衡。SMA 加固桥墩的震后残余位移和耗散能量最小，而钢加固桥墩的反应相反。钢-SMA混合增强可以在残余变形和能量耗散之间取得合理的平衡。