楔形削弱型节点滞回性能有限元分析

FINITE ELEMENT ANALYSIS OF HYSTERETIC BEHAVIOR OF WEDGE REDUCED CONNECTION

为了研究梁柱刚性连接的楔形削弱型节点在循环荷载作用下的受力性能,采用有限元软件ABAQUS对两个系列共10个不同削弱参数取值的楔形削弱型节点模型进行了数值模拟分析。研究结果表明:楔形削弱型节点与翼缘狗骨形削弱节点的承载能力及滞回曲线的饱满程度相当,楔形削弱节点具有良好的滞回性能与耗能能力;楔形削弱型节点的滞回曲线呈现明显的不对称现象,且随着梁腹板削弱高度b增大,不对称现象加剧,承载能力随着参数b的增大先增大后减小,其临界值与梁高hb关系约为b/hb=0.14;削弱最深处距柱表面的距离a对节点的初始刚度没有影响,承载能力随着参数a的增大先减小后增大,其临界值约为梁高;综合节点的滞回曲线及应力分布来看,建议a/hb取为1.12左右,b/hb取为0.17~0.21。

In order to study the mechanical properties of beam-column rigid connection with wedge reduced design under cyclic loading,the finite element software ABAQUS was used to perform the numerical simulation analysis for 2 series models of 10 models with different reduced parameter values.The results showed that the bearing capacity and hysteretic curves of the wedge reduced connection and dog-bone connection were plump,indicating that the wedge reduced connection had good hysteretic behavior and energy dissipation capacity.There was an obvious asymmetry in the hysteretic curves of the wedge reduced connection,and the asymmetry was more serious with the increase of the reduced height b of the beam web.The bearing capacity increased firstly and then decreased with the increase of b,and b/hb=0.14 was the critical state,where the hbwas the beam height.The initial stiffness was not affected by the distance a between the most reduced section and the column face,and the bearing capacity decreased firstly and then increased with the increase of a,and the critical value of a was the beam height.1.12 for a/hband 0.17~0.21 for b/hbwere recommended based on the hysteretic curves and stress distribution.