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对1个常规内隔板式箱形柱-H型钢梁节点和3个梁翼缘圆弧扩大头和圆孔削弱型内隔板式箱形柱-H型钢梁节点进行了低周往复循环加载试验,试验结果表明,常规节点在梁翼缘对接焊缝处脆性断裂,节点塑性转角达不到FEMA要求的0.03rad。当柱内隔板与柱壁板间焊缝质量较好时,梁翼缘圆弧扩大头和圆孔削弱型节点的塑性转角可达0.03rad,承载力较常规节点提高约70%。圆弧扩大头构造显著降低了梁翼缘对接焊缝的应力集中程度,避免了对接焊缝脆断,圆孔构造促使梁削弱截面形成塑性铰。当内隔板与柱壁板焊缝质量较差时,箱形柱壁板间焊缝过早撕裂,导致内隔板式箱形柱-H型钢梁节点的延性和承载力明显降低。
A low-cycle reciprocating cycle loading was carried out on a conventional internal-partitioned box-type H beam node and three beam flange circular expansion heads and round-hole weakened internal partition type box-shaped column-H beam nodes The experimental results show that the conventional joints are brittle fracture at the butt welds of the beam flanges, and the plastic hinge angles can not reach 0.03rad as required by FEMA. When the quality of the weld between the inner wall of the column and the wall of the column is better, the plastic angle of the enlarged circular head and the circularly weakened beam of the flange of the beam reaches up to 0.03 rad, and the bearing capacity is increased by 70% compared with the conventional joint. Circular arc enlarged head structure significantly reduces the beam flange butt weld stress concentration, to avoid the butt weld brittle, round hole structure to promote the weakening of the beam to form a plastic hinge. When the quality of the weld between the inner bulkhead and the column wall is poor, the weld between the box-shaped column walls prematurely tears, resulting in the obvious decrease of ductility and bearing capacity of the inner box-type column-H type steel beam joints.