新型自复位变摩擦阻尼器试验研究

目前阻尼器运用广泛，但传统摩擦阻尼器无法适应不同的振动强度，且在地震作用后损坏严重，没有自复位功能。文章利用形状记忆合金的超弹性，提出一种新型的自复位变摩擦阻尼器，介绍了阻尼器的构造、基本工作原理并推导了其力学模型，之后对阻尼器进行了力学试验。得到如下结论：该阻尼器不仅能在不同等级地震作用下满足耗能要求，还具有良好的自复位能力；力学试验得到的滞回曲线与理论推导的力学模型吻合较好，印证了力学模型的正确性；该阻尼器耗能能力随着合金丝直径、螺栓预紧力和坡面坡度的增大而增强；残余位移随着合金丝直径和坡面坡度增大而减小、随着预紧力增大而增大。

Experimental study on a new self centering variable friction damper

Since the damper is widely used nowadays, traditional friction dampers with no self centering function cannot adapt to different vibration intensities and will be seriously damaged after the earthquake. In this paper, a new type of self centering variable friction damper is proposed based on the superelasticity of shape memory alloy. The structure and basic working principle of the damper were introduced, and its mechanical model was then established. Through the mechanical test of the damper, the following conclusions are obtained: (1) The damper can not only meet the requirements of energy dissipation under different earthquake intensities but also has a good self centering ability. (2) The hysteretic curve obtained from the mechanical experiment is in good agreement with the derived mechanical model, which confirms the correctness of the model. (3) The energy dissipation capacity of the damper increases with the increase in the diameter of alloy wire, bolt preload, and slope gradient. The residual displacement decreases with the increase in the diameter of alloy wire and slope but increases with the increase in bolt preload.