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通过对折线加强隔板贯通方钢管轻骨料混凝土柱-H形钢梁异型节点和基本型异型节点试件进行低周往复加载试验,研究了隔板折线加强构造对节点破坏形态、承载力、塑性转角、滞回性能、骨架曲线、刚度退化和耗能等的影响。试验结果表明:基本型异型节点在刚度较大、几何尺寸变化较大的大截面梁翼缘对接焊缝侧边开裂,节点的塑性转角约为0.028 rad;隔板折线加强异型节点的主要破坏模式为隔板折线加强区形成塑性铰及延性拉断、梁腹板焊接孔开裂及梁翼缘对接焊缝断裂,其塑性转角可达0.034~0.057 rad,承载力和耗能能力较基本型异型节点分别提高16.5%~47.0%和21.2%~144.0%;隔板贯通方钢管轻骨料混凝土柱-H形钢梁异型节点中,大截面梁先于小截面梁破坏,柱壁板间焊缝未发生撕裂破坏,轻骨料混凝土未发生压碎、拉裂、剥离或滑移破坏,节点的抗震性能主要受钢梁和隔板间焊缝破坏(而非轻骨料混凝土)的影响。
The low-cycle reciprocating loading test was carried out on the specimens with deformed bar-through-square steel tubular lightweight aggregate concrete column-H-shaped steel beam as well as the deformed specimens with basic shaped irregular joints. The effect of the reinforced structure with the broken line on the failure morphology, bearing capacity, Plastic corner, hysteretic performance, skeleton curve, stiffness degradation and energy consumption. The experimental results show that the plastic deformation angle of the joints of the large-section beam flange butt joint with large stiffness and large geometric dimension cracking is about 0.028 rad, and the main failure mode of the reinforcing-shaped joints reinforced by the fold line is separated The plastic hinge and ductile fracture are formed in the reinforced zone of the plate fold line, the welding hole cracking of the webs and the fracture of the butt weld of the flange of the beam, the plastic angle can reach 0.034 ~ 0.057 rad, the bearing capacity and energy dissipation capacity increase by 16.5% ~ 47.0% and 21.2% ~ 144.0% respectively. Among the special-shaped joints of square steel tubular lightweight aggregate concrete columns with H-beam, the large cross-section beams were destroyed before the small section beam, The lightweight aggregate concrete did not crush, crack, peel or slip damage. The seismic performance of the joints was mainly affected by the weld failure between the steel beam and the bulkhead, but not the lightweight aggregate concrete.