An innovative structural fuse was developed based on the axial combination of structural steel and nickel–titanium (Nitinol) shape memory alloy (SMA) bars. To investigate the performance of the proposed system, six dampers with different steel and SMA configurations were evaluated experimentally under cyclic loads and the stress–strain curves of the samples were obtained. The results showed that as the amount of structural steel was increased with respect to the SMA, the energy dissipation capacity increased while the re-centring capability decreased and vice versa. An SMA/steel ratio of 1.0–1.5 produced energy dissipation and re-centring in a balanced amount. The proposed device thus has uses the advantages of both structural steel and SMA while limiting their disadvantages, with cyclic energy dissipation and strain recovery being the two contrary characteristics of the proposed dampers. Finite-element (FE) simulations were also conducted and the results were compared with the experimental results in order to verify the FE model. The FE model was able to accurately simulate the proposed hybrid damper.

中文翻译：

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采用结构钢和镍钛形状记忆合金棒的创新混合阻尼器

基于结构钢和镍钛 (Nitinol) 形状记忆合金 (SMA) 棒的轴向组合开发了一种创新的结构熔断器。为了研究所提出系统的性能，在循环载荷下对具有不同钢和 SMA 配置的六个阻尼器进行了实验评估，并获得了样品的应力-应变曲线。结果表明，随着相对于 SMA 的结构钢量增加，能量耗散能力增加，而再定心能力降低，反之亦然。1.0-1.5 的 SMA/钢比产生了能量耗散和平衡量的重新定心。因此，所提出的装置利用了结构钢和 SMA 的优点，同时限制了它们的缺点，循环能量耗散和应变恢复是所提出的阻尼器的两个相反的特性。还进行了有限元 (FE) 模拟，并将结果与​​实验结果进行比较，以验证有限元模型。有限元模型能够准确地模拟所提出的混合阻尼器。