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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。
In order to study the influence of beam flanges and web openings on failure modes of concrete-filled steel tubular columns with H-beam, six square concrete-H beam joints (one regular node and five open-hole nodes) Low cycle loading test. The experimental results show that the conventional joints of CFST-H type steel beams designed according to the current codes are brittle fracture at butt welds of beam flanges and the plastic corner of joints can not meet the requirements of the interim guidance FEMA. The reasonable beam flange and web hole structure , The stress concentration on butt weld of the flange of a square steel tubular beam-H beam was significantly reduced, the plastic hinge was formed on the weakened section of the beam, the plastic corner of the joint reached 0.03 rad, which satisfied the requirements of the temporary guideline FEMA; the hysteretic behavior was stable, The bearing capacity is equivalent to that of conventional joints. The joints with poor weld quality between the inner wall and the wall of the column wall occur in the test. The outer wall of the column wall, the weld seam between the column walls and the joint ductility and bearing capacity obviously decrease.