不同构造参数对弧形钢棒阻尼器性能的影响分析

为改善框架结构及底框结构梁柱节点的抗震性能,提出一种弧形钢棒阻尼器,介绍其构造和原理。设计12组不同构造参数的弧形钢棒阻尼器,采用ABAQUS软件对其进行有限元分析,研究截面形状、钢棒数量、截面尺寸、跨度、曲率半径对其滞回耗能能力、承载力特性的影响。研究结果表明:圆形截面弧形钢棒阻尼器的初始刚度、耗能量、等效黏滞阻尼系数略小于方形截面弧形钢棒阻尼器,但其屈服位移较小;单棒布置的阻尼器的耗能效果优于双棒布置的阻尼器;随着阻尼器截面尺寸的增大,阻尼器的初始刚度、耗能量、等效黏滞阻尼系数增加明显,屈服位移呈先减小后增加的趋势;随着阻尼器跨度的增大,初始刚度和等效黏滞阻尼系数总体上呈下降趋势,屈服转角呈上升趋势;随着阻尼器曲率半径的减小,阻尼器的耗能量、等效黏滞阻尼系数、初始刚度逐渐减少,但屈服转角逐渐增大。

Performance study on arc-shaped steel damper under different constructional parameter

In order to improve seismic performance of the frame structure,a Arc-Shaped Steel Damper(ASSD) was proposed for seismic reinforcement in the beam-column joints.12 different models were designed to research the loading capacity and the hysteretic performance of the ASSD.The constructional parameter of the ASSD included section shape,number of steel bar,size of section,size of span and radius of curvature.All models were carried out numerical simulation with ABAQUS.The analysis results showed that the initial stiffness,energy dissipation capacity and equivalent damper ratio of ASSD with circular section is slightly smaller than ASSD with square ASSD,but the yield displacement of the former is smaller;the efficiency of energy dissipation of ASSD with one steel bar is better than ASSD with two steel bar.With the increasing of size of section,the initial stiffness,energy dissipation capacity and equivalent damper ratio increase significantly,the yield displacement increases first and then decreases.With the increasing of size of span,the initial stiffness and equivalent damper ratio decline generally,the yield displacement increases gradually.With the decreasing of radius of curvature,the initial stiffness,energy dissipation capacity and equivalent damper ratio decrease gradually,but yield displacement increases gradually.