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为了研究压-弯-剪-扭复合受力焊接栓钉型钢混凝土柱的滞回性能,通过研发的试验装置,对设计的9个试件进行恒定轴压力下低周反复弯-剪-扭的加载试验,考虑了栓钉位置、栓钉间距和栓钉长度等3个变化参数。通过试验观察了试件的受力破坏过程及形态,获取其弯矩-位移和扭矩-扭率滞回曲线,并分析了试件破坏形态、滞回曲线、刚度退化、能量耗散、延性等抗震性能指标。结果表明:恒定轴压力反复弯-剪-扭作用下,型钢混凝土试件表现为以弯曲破坏为主、伴随扭转斜裂缝的弯扭型破坏形态;弯矩-位移滞回曲线呈梭形,滞回环饱满,而扭矩-扭转角滞回曲线则呈反S或Z形,滞回曲线不饱满;扭矩作用下,型钢混凝土柱的延性变差;通过焊接栓钉可提高其延性,栓钉间距越小延性越好,当型钢翼缘和腹板交错焊接栓钉时,更有利于提高构件的抗震性能。
In order to study the hysteretic behavior of the welded-spiked steel-reinforced concrete column under compression-bending-shear-torsion compression, the nine designed specimens were subjected to low cycle repeated bending-shear-torsion Loading test, consider the peg location, peg spacing and peg length and other three changes in parameters. Through the test, the process and the form of the stress-failure process were observed and the bending moment-displacement and torsional-torsional hysteresis curves were obtained. The failure morphology, hysteresis curve, stiffness degradation, energy dissipation and ductility Seismic performance index. The results show that under the condition of repeated bending-shear-torsion under constant axial pressure, the test specimens of steel reinforced concrete mainly show bending failure with the torsional and torsional failure modes of twisted diagonal cracks. The bending moment-displacement hysteresis curves are fusiform and hysteresis Loop full, and torque - torsion hysteresis curve was anti-S or Z-shaped, hysteresis curve is not full; under the action of torque, the ductility of steel reinforced concrete columns worse; by welding pegs can increase its ductility, peg spacing Small ductile the better, when the steel flange and web staggered welded studs, more conducive to improving the seismic performance of components.