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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Shaking table tests of steel frame with superelastic Cu-Al-Mn SMA tension braces
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Shaking table tests of steel frame with superelastic Cu-Al-Mn SMA tension braces

机译：超弹性Cu-Al-Mn SMA拉伸支架钢框架的振动台试验

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Shaking table tests are performed on a one-bay one-story steel frame with superelastic Cu-Al-Mn shape memory alloy (SMA) tension braces. The frame is subjected to a series of scaled ground motions recorded during the 1995 Kobe earthquake, Japan. The test results demonstrate that the SMA braces are effective to prevent residual deformations and pinching. It is also shown that the time history responses observed from the shaking table tests agree well with the numerical predictions using a rate-independent piecewise-linear constitutive model calibrated to the quasi-static component tests of the SMA braces. This suggests that the loading rate dependence of Cu-Al-Mn SMAs as well as the modeling error due to the piecewise linear approximation can be neglected in capturing the global response of the steel frame. Numerical simulations under a suite of near-fault ground motion records are further performed using the calibrated analytical models to demonstrate the effectiveness of the SMA braces when the variability of near-fault ground motions is taken into account. A stopper, or a deformation restraining device, is also proposed to prevent premature fracture of SMA bars in unexpectedly large ground motions while keeping the self-centering capability in moderate to large ground motions. The effectiveness of the stopper is also demonstrated in the quasi-static component and shaking table tests. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：振动台测试是在具有超弹性Cu-Al-Mn形状记忆合金（SMA）拉力支撑的单层一层钢框架上进行的。在1995年日本神户大地震期间，该框架经受了一系列按比例缩放的地面运动。测试结果表明，SMA支架可有效防止残余变形和挤压。还显示了从振动台测试观察到的时程响应与使用与速率无关的分段线性本构模型进行校准的数值预测非常吻合，该模型已针对SMA支架的准静态分量测试进行了校准。这表明，在捕获钢框架的整体响应时，可以忽略Cu-Al-Mn SMA的加载速率依赖性以及由于分段线性近似而引起的建模误差。使用校准的分析模型，进一步在一组近断层地震动记录下进行了数值模拟，以证明当考虑到近断层地震动的变化性时，SMA支撑的有效性。还提出了一种塞子或变形抑制装置，以防止SMA棒在意外大的地面运动中过早断裂，同时在中等到大的地面运动中保持自定心能力。准静态组件和振动台测试也证明了塞子的有效性。版权所有（c）2015 John Wiley＆Sons，Ltd.

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