Steel braces reduce the interstory drifts of steel structures under earthquake excitations; however, severe earthquakes could still cause some notable residual drifts in the structures. The reduction of these residual drifts decreases post‐earthquake retrofitting costs. This study investigates the seismic performance of steel frames equipped with a proposed self‐centering damper, using shape‐memory alloy (SMA) wires. For this purpose, incremental dynamic analyses are carried out on the steel frames of 3, 7, and 12 stories with self‐centering dampers of different capacities. The results of cyclic tests validate damper numerical modeling. The results indicate that the proposed damper limits the residual drifts. Also, fragility curves illustrate that the damper reduces the exceedance probabilities of limit states associated with residual story drift. The comparison among three design cases demonstrates that the most appropriate capacity for SMA dampers happens when it obtains the average capacity value required for equality between damper stiffness and strength and braces stiffness and strength, respectively. This particular design will eventually lead to the most efficient scenario in cases of performance and cost.

中文翻译：

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形状记忆合金线基阻尼器对钢框架抗震性能的评估

钢支撑减少了地震激励下钢结构的层间位移；但是，严重的地震可能仍会在结构中引起一些明显的残余漂移。这些残余漂移的减少降低了地震后的改造成本。这项研究使用形状记忆合金（SMA）线研究了配备拟议的自定心阻尼器的钢框架的抗震性能。为此，在3、7和12层钢框架上使用不同容量的自定心减震器进行了增量动力分析。循环测试的结果验证了阻尼器的数值模型。结果表明，提出的阻尼器限制了残余漂移。同样，脆弱性曲线表明，阻尼器降低了与残余物层漂移相关联的极限状态的超出概率。三个设计案例之间的比较表明，当SMA阻尼器获得分别等于阻尼器刚度和强度以及支撑刚度和强度所需的平均容量值时，就会发生最合适的SMA阻尼器容量。在性能和成本方面，这种特殊的设计最终将导致最有效的方案。