钢筋混凝土L形截面柱框架低周反复加载试验研究

Experimental study on RC frame with L-shaped columns subjected to low-cyclical loading

通过两榀比例为1/3的钢筋混凝土L形截面柱框架结构在反复荷载作用下的试验,研究了L形截面柱框架结构的破坏特征、滞回特性、梁柱出铰顺序、结构整体刚度与层间刚度、耗能性能、延性及异形柱截面中和轴变化规律等,分析了框架整体及L形柱的扭转效应。研究结果表明:L形截面柱框架的破坏属于"强柱弱梁"型,抗震性能较好,框架扭转效应较小,可忽略;结构的位移延性系数满足抗震规范的要求;在屈服荷载前异形柱的截面变形符合平截面假定。

Based on experiments of two reinforced concrete frames with L-shaped columns under low-cyclical loading,the scale of frames was 1/3,failure and hysteretic characteristics,plastic hinge of beam and column,whole structural stiffness and the inter-storey stiffness,energy dissipation,ductility and different positions of neutral axis were studied.Torsion effects of the frame and L-shaped column were analyzed.The experiment results indicate that the frames with L-shaped columns are destroyed due to the beam hinge,have better seismic performance,torsion deflection are small during test and the torsion effects may be ignored.The ductility of the frames can satisfy the requirement of the seismic code.Plane sections for special-shaped columns remain plane.