方钢管轻骨料混凝土柱-H型钢梁与箱型梁隔板贯通式异型节点抗震性能试验研究

iaphragm-through irregular joints of lightweight aggregate concrete-filled square steel tubular column and H-section steel beam and steel box beam, including irregular joints with strengthened arc junctures and traditional irregular joint, were tested under low-reversed loading to comparative study on the influence of strengthened arc junctures on seismic performance of the irregular joints. The failure modes, hysteresis loops, bearing capacity, plastic rotation and energy dissipation of the irregular joints were obtained from the experimental results. Tests results indicate that the hysteresis curves of the diaphragm-through irregular joints are stable without significant degradation of bearing capacity. There are no tearing failures of welding between diaphragm-through ribs and column walls until joints failure. The post-test examination on the specimens does not reveal any lightweight aggregate concrete materials failure in all tested specimens. The lightweight aggregate concrete and diaphragm-through ribs and column walls are firmly bonded together without separated or slip failure. The traditional irregular joint brittle fractures at the edges of butt weld of box steel beam flanges with large rigidity and sharply changed geometry. The plastic rotation of H-section steel beam and steel box beam of the traditional irregular joint are about 0.023rad and 0.031rad, respectively. The main failure modes of the irregular joints with strengthened arc junctures are plastic hinge formed at the enlarged arc junctures, crack of fillet at welding holes of beam web and ductile fracture of butt weld of beam flanges. The plastic rotation of the irregular joints with strengthened arc junctures can research 0.038~0.056rad, and the energy dissipation capacity and the bearing capacity may increase by 82%~251% and 14.2%~56.2% compared with that of the traditional irregular joint, respectively.