Numerical Analysis of a Self-centering Energy Dissipating Device Based on Shape Memory Alloy Bar
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摘要: 研发了一种基于形状记忆合金棒材的自复位耗能装置。通过对形状记忆合金棒进行循环拉伸试验, 分析了SMA材料的超弹性性能与耗能能力, 建立了SMA材料的分段线性伪弹性本构模型, 与试验数据进行对比以验证其合理性;阐述了该装置的理论模型与耗能原理, 并利用有限元分析软件进行了数值模型试验, 分析结果表明:该自复位耗能装置在循环荷载作用下, 具有稳定的滞回特性, 且单位循环耗能量大, 残余变形很小, 表现出良好的自复位能力与耗能能力。Abstract: An innovative self-centering energy dissipating device based on shape memory alloy (SMA) bar was proposed. The material cyclic stretching tests on shape memory alloy bar were conducted to assess the superelastic capacity and energy dissipating capacity. Data from the piecewise linear pseudo-elastic constitutive model of SMA material established were compared with the test data in order to verify the vadility of the model. The theoretical model and the energy consumption principle were briefly described. Furthermore, numerical simulation test was carried out by the finite element analysis software. The results show that self-centering energy dissipating device has stable hysteresis capability under the cyclic loading. The energy consumption per unit cycle is high and the residual deformation small, presenting satisfying energy dissipating property and self-centering property.
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