Development of superelastic SMA angles as seismic-resistant self-centering devices
Development of superelastic SMA angles as seismic-resistant self-centering devices
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DOI：
10.1016/j.engstruct.2020.110836
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发表时间：
2020-09
影响因子：
5.5
通讯作者：
Bin Wang;Songye Zhu;Kaixin Chen;Jiahao Huang
中科院分区：
文献类型：
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作者：
Bin Wang;Songye Zhu;Kaixin Chen;Jiahao Huang
由于形状记忆合金固有的独特的超弹性，利用形状记忆合金(SMA)构建抗震自定心装置在地震恢复力领域显示出诱人的前景。本文研究了超弹性形状记忆合金角钢在循环荷载作用下的力学行为。首先阐述了超弹性形状记忆合金角的变形机理。随后，采用不同的加载方案对SMA角进行了试验研究。在不同的加载幅值下，评估了各种力学性能，如强度、自定心和能量耗散能力。试验结果表明，在多个加载循环下，形状记忆合金角均能呈现出令人满意的旗形滞回曲线。不同的措施，如训练过程或加入反向压缩循环，可以有效地稳定滞回曲线，并最大限度地减少重复循环中的强度退化和残余变形。用有限元方法模拟了形状记忆合金角的循环行为，补充了实验中的观察和认识。所提出的形状记忆合金角有望为工程结构提供有效的自定心功能，以达到地震恢复力的目的。
Given their inherent unique superelasticity, the use of shape memory alloys (SMAs) to build seismic-resistant self-centering devices has presented attractive prospects in the field of earthquake resilience. This work investigates the mechanical behavior of superelastic SMA angles subjected cyclic loading. The deformation mechanism in superelastic SMA angles is elaborated first. Subsequently, experimental investigations of SMA angles are conducted using different loading protocols. Various mechanical properties, such as strength, self-centering and energy dissipation capabilities, are evaluated under varying loading amplitudes. Testing results show SMA angles can exhibit satisfactory flag-shaped hysteresis loops under multiple loading cycles. Different measures, such as the training process or the inclusion of reversed compressive cycles, can stabilize the hysteresis loops effectively and minimize the strength degradation and residual deformation in the repeated cycles. The cyclic behavior of the SMA angles is also simulated by using the finite element method to complement the observation and understanding obtained from the experiments. The proposed SMA angles are expected to offer an effective self-centering function to engineering structures toward earthquake resilience.