钢管混凝土组合结构全螺栓隔板贯通节点的抗震性能试验研究

该文以方形钢管混凝土柱-H型钢梁全螺栓隔板贯通连接节点为研究对象,以梁偏心为参数,进行了2个足尺的节点试件SJ1和SJ2的低周往复荷载试验,研究了该类型节点的破坏机理与抗震性能。通过试验数据处理与分析得出了该节点类型的破坏机理、滞回曲线、骨架曲线、延性系数、耗能能力及刚度变化规律;通过隔板应变分析验证了试件的破坏机理。试验结果表明：该类型节点具有很好的抗震性能,节点承载力高,滞回曲线饱满,延性系数较大,耗能能力强等特点;主要变形发生在梁端塑性铰区域,隔板与柱连接处容易出现应力集中现象。两组节点在设计时均考虑了抗震设计要求,破坏形式基本相同,以隔板端部梁翼缘及腹板屈曲破坏为主,但由于SJ2梁存在偏心,在荷载作用下节点下隔板与柱连接处被撕裂。

EXPERIMENTAL STUDIES ON ALL-BOLTS AND DIAPHRAGM-THROUGH JOINT’S ASEISMIC BEHAVIOR OF CONCRETE-FILLED STEEL TUBULAR STRUCTURE

As the research object is all-bolts and the diaphragm-through joint between a concrete-filled square-steel tubular-column and an H-section beam, two full-scale specimens SJ1 and SJ2 with different eccentricities were subjected to a low-reversed cyclic load to obtain the failure mechanism and aseismic performance. The failure mechanism, hysteretic curve, skeleton curve, ductility factor, energy-dissipating capacity and the change rule of rigidity were obtained through the test data processing and analysis; the failure mechanism is also verified through the strain analysis of the partition. The result of the experiment shows that the type of a joint is characterized by a good aseismic behavior, high bearing capacity, a full hysteretic curve, a large ductility coefficient, and strong energy dissipation capacity; the deformation mainly takes place in a plastic hinge area, the end of the beam, and stress focus phenomena were easily seen at the connection of the partition and the beam. The anti-seismic requirements had been taken into consideration during the design of the two specimens. Both of the failure modes are basically same, which was mainly buckling failure of the beam flange edge at the end of the partition and web buckling. However, as a steel beam with eccentricity, specimen SJ2 was tore by the effect of loading at the connection of a bottom partition and a column.