型钢混凝土异形柱-钢梁空间边节点的抗震性能及影响因素分析

为了研究型钢混凝土异形柱-钢梁空间边节点的抗震性能,以配钢形式、加载角度和轴压比为变化参数,通过1个平面节点和9个空间节点的拟静力试验,获取其滞回关系,并在此基础上探讨了该类新型空间节点的抗震行为。研究结果表明:实腹式配钢试件在骨架曲线的上升段为最陡,承载能力最大,刚度退化最轻,但T形钢桁架试件在耗能能力和延性性能上为最优;该类空间节点的抗震性能在不同加载角度下具有一些区别,45°试件的骨架曲线包围了其余加载角度下的骨架曲线,同时该角度的节点抗剪承载力为最大,耗能能力较之0°和60°的更强,但略比30°的低,而位移延性在平面节点上表现为最佳;提高轴压比可增强型钢混凝土异形柱边节点的受剪承载力和耗能能力,同时轴压比的增大对试件的初期刚度较为有利而后期刚度退化较快。

SEISMIC BEHAVIOR AND INFLUENCE FACTOR ANALYSIS ON 3D SIDE JOINTS COMPOSED OF STEEL REINFORCED CONCRETE SPECIAL-SHAPED COLUMNS AND STEEL BEAMS

In order to research the influence relationship between the mechanical behavior under an earthquake action and a steel form, the loading angle, axial compression ratio, one plane side joint and nine space side joints composed of SRC special-shaped columns and steel beams were tested under low frequency cyclic loading. The hysteretic relationships between load and displacement were obtained. Based on these, the aseismic behavior of space joints was discussed. The results show that there are steepest skeleton curves, largest bearing capacity, and lightest stiffness degradation for specimens with solid-web steel. However, the specimens with T-shaped steel form are the optimal in energy dissipation capacity and ductility performance. There are some of the differences in aseismic behaviors of these space joints under different loading angles. The skeleton curves under the rest of loading angles are surrounded by those curves under the loading angle of 45 degrees. The shear capacity under 45degrees is the largest and its energy dissipating capacity is stronger than those under 0 degree and 60 degrees, but lower than that under 30 degrees. The displacement ductility of a plane joint is the best. With the increase of axial compression ratios, the shear bearing capacity and energy dissipation capacity of the SRC side joints of a special-shaped column frame can be enhanced and it is good for the initial stiffness but leads to be a phenomenon of a rapid late-stiffness degradation.