外环式空间钢管混凝土柱-钢梁节点受剪性能

为了探讨空间钢管混凝土柱-钢梁环板节点的受剪性能,基于ABAQUS建立圆形和方形空间环板节点在3种不同梁端加载方式下的有限元模型,分别对节点域的剪力-梁端位移曲线进行分析.在此基础上,选取4个影响节点域抗剪的参数进行分析,以此来明晰空间钢管混凝土节点的受剪机理.结果表明:平面内-平面外梁端依次加载为节点域受剪的最不利加载方式,钢梁强度、柱混凝土强度、柱钢管强度对节点域抗剪起着有利作用,轴压比在一定范围内对抗剪有利,超过这个范围反而不利.

Investigation of shear performance of outer ring-type node in spatial structure of concrete filled steel tube column-steel beam

In order toprobe the shear performance of annular stiffener node in spatial structure ofconcrete filled steel tube (CFST) column-steel beam, the finite element models of circular and square spatial annular stiffener node were establishedunder three different loading modes on beam end by means of finite element software ABAQUS and the dependence of shear in node domain on displacement of beam end was analyzed. On this basis, four parameters that would affect the anti-shear performance of the node domain were selected and analyzed, so that the shear mechanism of spatial steel tube concrete node was clarified thereby. The result showed that the sequential loading at beam end in plane or out plane would make the shear performance of node domain mostunfavorable, the strength of steel beam, concrete column, and steel tube would be beneficial to the anti-shear performance of the node domain, and the axial compression ratio would be advantageous in a certain range, but more than that, the case would be opposite.