In this paper, a new shape memory alloy (SMA) damping device named confined superelastic dissipator (CSD) was examined. The proposed dissipator consists of a fused superelastic nickel‐titanium (NiTi) SMA bar as the functional kernel component encased in grout‐filled steel tube. The bar carries the axial load and dissipates energy through axial deformation while the steel tube and infill grout restrain the bar and precludes buckling in compression. First, theoretical derivations for the design of the buckling restraining system were discussed. Then, the hysteretic behavior of CSDs was investigated through cyclic quasistatic tests. A total of eight specimens were designed, fabricated, and tested. All specimens exhibited stable and flag‐shaped hysteretic behavior with excellent self‐centering characteristics. Response quantities of prime interest for earthquake engineering such as energy dissipation, equivalent viscous damping, and self‐centering capability were evaluated. The effect of geometric parameters such as fuse diameter and bar length on these parameters as well as failure mechanisms of CSDs was studied. Based on the experimental results and visual observations of failed specimens, specific recommendations were made to improve the performance of the CSDs.

中文翻译：

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抗震结构形状记忆合金耗能器的表征

本文研究了一种新型的形状记忆合金（SMA）阻尼装置，即密闭超弹性耗散器（CSD）。拟议的消散器由熔融的超弹性镍钛（NiTi）SMA棒组成，是填充在灌浆钢管中的功能性核心组件。钢筋承受轴向载荷并通过轴向变形消散能量，而钢管和填充浆液则限制钢筋并防止压缩屈曲。首先，讨论了屈曲约束系统设计的理论推导。然后，通过循环准静态测试研究了CSD的磁滞行为。总共设计，制造和测试了八个样本。所有样品均表现出稳定且呈旗状的磁滞行为，并具有出色的自定心特性。评估了地震工程中最重要的响应量，例如能量耗散，等效粘性阻尼和自定心能力。研究了诸如熔丝直径和棒长之类的几何参数对这些参数的影响以及CSD的失效机理。根据实验结果和对不合格标本的目视观察，提出了具体建议以改善CSD的性能。