位移放大型扭转阻尼器性能分析

为了加固梁柱节点、避免框架结构出现"弱节点"的破坏模式、提高框架结构整体的抗震和耗能能力,研制出一种具有自主知识产权的位移放大型扭转阻尼器(DATD),并对其进行数值分析和试验研究.首先,设计了18个具有不同参数的DATD,建立其有限元模型进行数值分析;随后,设计并制作了一个DATD,进行性能试验并与有限元分析结果对比.结果表明:DATD滞回曲线饱满,耗能能力强;有限元分析与性能试验的滞回曲线吻合较好,且随着加载位移的增加,两者间误差变小,因此可以采用建立的有限元模型来研究DATD的力学性能.最后,对DATD进行参数影响分析,研究了铅芯直径、铅芯距中轴距离、橡胶层直径、橡胶层厚度及橡胶剪切模量对其特征参数的影响,结果表明:DATD的屈服剪力、等效刚度、等效阻尼比及耗能系数随着铅芯直径增大而明显增大,随着铅芯距中轴距离的增大略有增大;随着橡胶层直径、橡胶剪切模量的增大,屈服剪力及等效刚度逐渐增大而耗能系数及等效阻尼比逐渐减小;4个特征参数均随着橡胶层厚度的增大而略微减小.

Performance Analysis of Displacement-amplified Torsion Damper

In order to strengthen beam-column joints, avoid the failure mode of "weak joints" in frames and improve the overall seismic and energy consumption capacity of frame structures, a displacement-amplified torsion damper (DATD) with independent intellectual property rights is developed. Numerical analysis and experimental study of DATD were carried out. Firstly, a total of 18 models of DATD with different parameters were designed and their finite element models were established, and then numerical analyses were performed. Then a DATD was designed and manufactured. The results of finite element analysis were verified by performance tests. The results show that the DATD has full hysteretic curve and strong energy dissipation capacity. The hysteretic curves of finite element analysis and performance test are in good agreement, and with the increase of loading displacement, the difference between them decreases. So, the finite element model established in this paper can be used to study the mechanical properties of DATD. Finally, the parameter influence analysis of DATD was performed, the influences of the diameter of the lead core, the distance between the lead core and the central axis, the diameter of the rubber layer, the thickness of the rubber layer and the rubber shear modulus on its characteristic parameters were studied. The results show that the yield shear force, equivalent stiffness, equivalent damping ratio and the energy dissipation coefficient of DATD increase obviously with the increase of the diameter of the lead core, and increase slightly with the increase of the distance between the lead core and the central axis. With the increase of the diameter of the rubber layer and rubber shear modulus, the yield shear force and equivalent stiffness gradually increase, while the energy dissipation coefficient and equivalent damping ratio gradually decrease. The four characteristic parameters all decrease slightly with the increase of the thickness of the rubber layer.