【摘要】 对4个足尺试件进行低周反复荷载试验,研究全螺栓连接隔板贯通的方钢管混凝土柱与钢梁连接节点的抗震性能。试验考虑了钢梁偏心、钢梁截面尺寸及隔板焊接的影响,对试件的极限承载力、破坏形式、延性及耗能能力进行测试和分析。结果表明:钢梁偏心试件的破坏形式均为隔板螺栓群中角部螺栓孔受拉开裂,无偏心试件的破坏形式均为隔板受拉断裂;焊接隔板对节点承载力没有影响,当钢梁截面高度从600mm增至700mm时,承载力提高约50%;该类节点的滞回曲线较为饱满,钢梁截面较大的试件延性较好,钢梁偏心可导致节点延性下降,其延性系数为轴心构件的85%;焊接隔板对节点的延性影响较小,但其能量耗散系数比整体隔板试件降低约16%~37%,表明焊接缺陷可影响节点的耗能能力。更多还原

【Abstract】 In order to obtain the seismic performance of all-bolt and diaphragm-through joint between concrete-filled square steel tubular column and steel beam,four full-scale specimens subjected to low-reversed cyclic load were investigated. Influence factors such as eccentricity of steel beam,cross section of steel beam and weld defect of diaphragm were considered to test the ultimate bearing capacity,failure mode,ductility and energy dissipation capacity of each specimen. Results show that the eccentric specimens failed due to the cracking of corner bolt hole on the diaphragm,and the specimens without eccentricity failed due to the cracking of diaphragm. Welded diaphragm had no effect on the bearing capacity,and the bearing capacity increased about 50% when the cross section height of steel girder increased from 600mm to 700mm. Hysteretic curves for these specimens were plump,and the specimen with bigger cross section owned better ductility. The eccentricity of steel beam may decrease the ductility,which accounts for 85% of beams without eccentricity. Welded diaphragm has little effect on the ductility,but it decreases the energy dissipation coefficient by 16% ~ 37% when it is compared with specimens with a whole diaphragm,which shows that welding defects affect the energy dissipation capacity of the joints much.更多还原