一种新型自复位SMA-剪切型铅阻尼器的试验及其数值分析

EXPERIMENTAL AND NUMERICAL ANALYSIS OF AN INNOVATIVE RE-CENTERING SHAPE MEMORY ALLOYS-SHEARING LEAD DAMPER

利用形状记忆合金(shape memory alloys,SMA)的超弹性以及金属铅的屈服耗能特性,开发出一种新型复合耗能自复位阻尼器,由形状记忆合金丝、剪切型铅块以及复位弹簧组成,其特点是结构简单、制作方便,同时具有高耗能及自复位功能。制作了阻尼器模型,并进行了力学试验,研究了在循环荷载作用下不同加载速率、不同位移幅值对其力学性能的影响。建立阻尼器的力学模型对其进行了数值模拟,结果表明:新型阻尼器在循环荷载作用下滞回性能稳定,利用形状记忆合金与铅同时工作耗能,阻尼器具有良好的耗能能力;复位弹簧的设置能使阻尼器具有良好的自复位能力;数值模拟结果与试验结果吻合较好,验证了力学模型的正确性。

An innovative re-centering shape memory alloys-shearing lead damper was proposed based on the super-elasticity of shape memory alloys（SMAs） and the energy dissipation property of lead when yield. Consisting of SMA, shearing leads and springs, the damper presented a high energy-dissipation and re-centering capability with a simple structural configuration and was easy to manufacture. A model of the damper was made and tested to study the impact of different loading rates and displacement amplitudes on its mechanical properties under cyclic loadings. A theoretical model of the damper was proposed to simulate its mechanical properties. The results proved that the damper had a stable hysteretic behavior under cyclic loadings. By using SMA and lead working together, the damper showed a good energy dissipation capability. The re-centering spring introduced a good re-centering ability of the damper. The numerical results agreed well with the test data, which proves that the proposed model is valid.