梁腹板开孔型梁柱节点滞回性能分析

HYSTERETIC BEHAVIOR ANALYSIS OF BEAM-TO-COLUMN CONNECTIONS WITH PERFORATIONS ON BEAM WEB

提出了一种改进形式的腹板开孔型梁柱节点,在腹板矩形开孔的基础上对两侧边进行半圆弧开孔,运用有限元软件ABAQUS对已有梁翼缘削弱型梁柱节点的循环荷载试验进行三维实体建模分析,通过对比试验与有限元得到的滞回曲线及破坏形态对有限元建模方法的有效性进行验证,然后进行了15个不同开孔细部尺寸的节点模型在循环荷载作用下的模拟分析。当腹板开孔高度H不大于梁截面高度hb的47%时,未能有效地实现塑性铰外移,滞回曲线基本与未削弱的标准模型的重合。当腹板开孔高度达0.53hb时,节点的承载力明显降低,塑性铰在开孔区域形成。随着开孔矩形部分宽度B的增大,节点的承载能力逐渐降低,但降低幅度不大,塑性变形向开孔区域转移。建议开孔削弱中心距离柱翼缘表面的距离L取为hb,腹板开孔矩形部分高度H和宽度B分别为0.53hb和0.5hb左右,最后通过改变梁柱截面对该组削弱参数取值进行了合理性验证。

The paper put forward an improved form of beam-to-column connection with perforations on beam web,in which two semicircle perforations are introduced on both sides of rectangle perforation in the beam web. The finite element analysis software ABAQUS was adopted to build a 3 D solid model for existed beam-to-column connection with reduced beam flange under cyclic loading. The finite element modelling（ FEM） method was validated through comparing the hysteretic curves and failure modes of the test and FEM,and then 15 connection models with different perforation dimensions were designed and analyzed under cyclic loading. When the web opening height H was less than 47% of beam section height hb,the plastic hinge could not move away from the beam-column interface,and the hysteretic curves almost overlapped with the standard model without web perforation. When the web opening height H achieved 0. 53 hb,the bearing capacity reduced obviously,and the plastic hinge formed in the perforation region. With the increasing of web opening width B of rectangle part,the bearing capacity decreased slightly,and the plastic deformation transferred to the perforation regions. The parameters of distance between the opening center and column flange surface L = hb,web opening height H was 0. 53 hb,the rectangle part opening width B of 0. 50 hbwas recommended,and the rationality of the suggested parameters were proved by changing the beam and column section finally.