钢筋混凝土异形柱框架节点抗震性能试验

对6个T形截面柱框架节点试件(2/3缩尺)进行低周期反复荷载作用下的试验研究。分别以梁截面高度、柱轴压比和节点区水平箍筋体积配箍率为变量参数,研究其对节点区裂缝的形成与开展、节点的破坏机理和节点抗震性能(其中包括梁纵向钢筋锚固、节点延性和耗能等)的影响。提出在低周期反复荷载作用下T形柱框架节点的裂缝呈反“K”型,而不是类似于常规矩形节点的“X”型交叉裂缝,其受力机理偏于较陡的斜压杆受力模型。同时指出节点区翼缘板宽度对节点抗震性能的影响与梁柱抗弯刚度比有关。

ASEISMIC PERFORMANCE EXPERIMENT ON THE SPECIAL-SHAPED COLUMN FRAME STRUCTURES JOINTS OF REINFORCED CONCRETE

It is made an experiment on six T-shaped cross section column frame joints (2/3 reduced scale) under low-cycle repeated loads. According to different experiment aim, three groups are made. It is used that variable parameters of beam section height, the axis-pressed ratio and the hoop steel ratio to research their effects on cracks form and development, failure mechanism of the joints and the a seismic performance (including to anchorage of beam bars, joints ductility and energy consumption). It is pointed out that joints' crack shape appears reverse “K” but not the common rectangle joints' “X” shape, the forced mechanism is liable to the inclined press-pole mechanism. At the same time, it is also pointed out that the effect of the flange width of the joints on the aseismic performance of the joints relates to the bending stiffness ratio of beam and column.