梁翼缘、腹板开孔方钢管混凝土柱-H型钢梁节点力学性能试验研究

为研究梁翼缘、腹板开孔构造对方钢管混凝土柱-H型钢梁节点破坏模式的影响，对6个方钢管混凝土柱-H型钢梁节点（1个常规节点和5个开孔节点）进行了低周循环加载试验。试验结果表明：按现行规范设计的方钢管混凝土柱-H型钢梁常规节点在梁翼缘对接焊缝处脆性断裂，节点的塑性转角不能满足临时指南FEMA的要求；合理的梁翼缘和腹板开孔构造，显著减缓了方钢管混凝土柱-H型钢梁节点梁翼缘对接焊缝的应力集中，梁削弱截面形成塑性铰，节点塑性转角达到0.03 rad，满足了临时指南FEMA的要求；其滞回性能稳定，承载力和常规节点相当；内隔板与柱壁板间焊缝质量较差的节点在试验中发生柱壁外鼓、柱壁间焊缝撕裂，节点延性和承载力明显下降。

Low-cycle reversed loading tests on joints of H-style steel beam-square steel tubular column filled with concrete with opening holes at beam flanges and web

In order to study the effect of opening holes at beam flanges and beam web on the failure mode of joints of H-style steel beam-square steel tubular column filled with concrete,low cyclic reversed loading tests were performed on six joints including one conventional joint and five joints with opening holes at beam flanges and beam web.The experimental results indicate that the conventional joint of H-style steel beam-square steel tubular column filled with concrete fractures at beam flanges butt weld.The plastic rotation doesn’t meet the requirement of the interim guidelines FEMA.The stress concentration at beam flange butt weld of joints of H-style steel beam-square steel tubular column filled with concrete is remarkably mitigated by means of opening holes at beam flanges and beam web.The plastic hinge is formed at reduced beam section,and the plastic rotation of the joints reaches at 0.03 rad and do meet the requirement of the interim guidelines of FEMA.The hysteresis loops keep steadily and the bearing capacity of the joints with opening holes at beam flanges and beam web is equal to that of conventional joint.For the joint with poor welding between the column walls and the stiffened ribs at panel zone,convex deformation is formed at the column walls and rupture is observed at the weld between column walls.The ductility and the bearing capacity of these joints are reduced obviously.