新型钢板阻尼器的减震性能分析

Analysis on vibration suppression of a new type of planar steel damper

通过改变钢板的平面几何形状减小应力集中,提出一种利用钢板平面内受力屈服耗能的新型钢板耗能阻尼器,并对其进行有限元数值计算,计算结果表明这种阻尼器初始刚度较大、滞回曲线饱满、耗能效果较好。为了利用有限元软件ABAQUS实现对安装有该类钢板阻尼器的整体结构模型进行计算分析,提出该类钢板阻尼器的双线型恢复力模型及其在软件中的简化计算方法。在此基础上,对安装与未安装该类钢板阻尼器的框架结构进行地震作用下动力有限元计算,从加速度反应和位移反应两方面对安装与未安装该类钢板阻尼器的框架结构的计算结果进行分析比较,结果表明该类钢板阻尼器在水平方向上对结构具有良好的减震效果,是一种有效的减震装置。

By changing the geometric parameters with the objective to reduce the stress concentration,a new type of planar steel damper that dissipates seismic energy using the in-plane yield of the steel was proposed.The finite element calculation shows that this new type of damper possesses the large initial stiffness and the stable hysteretic capacity,which shows it has a good capacity of dissipating energy.In order to analyze the overall structural model equipped with such steel dampers using the FEM software ABAQUS,the bilinear hysteretic model and the corresponding simplified calculation method were proposed.Lastly,using the FEM softwareuake,dynamic analyses of two frame structures,one involving the steel damper and the other one without the damper,subjected to earthquake excitation were performed.The acceleration and displacement responses of structures were analyzed,which indicates that this type of planar steel damper can mitigate the damage of earthquakes effectively.