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为研究T形节点的抗震性能及节点破坏机理,通过对反复荷载下3组(6个)节点试件的试验,研究梁截面尺寸(截面高度)、轴压比和节点配箍率对节点抗震性能的影响,发现T形柱框架节点在低周期反复荷载作用下的裂缝形式与常规矩形节点的X形交叉裂缝不同,其呈反K形。同时利用有限元分析软件ABAQUS对3组节点试件进行弹塑性模拟分析,并验证T形柱框架节点在低周期反复荷载作用下的裂缝呈反K形。针对此类裂缝提出设计建议,对损伤塑性模型中的主要参数影响机理及取值进行简要说明。
In order to study the seismic behavior of the T-joints and the failure mechanism of the joints, the influences of the beam cross-section (cross-section height), axial compression ratio and node stirrup ratio on the joint quake resistance It is found that the crack shape of T-shaped frame joints under low cyclic loading is different from the X-shaped cross-crack of conventional rectangular joints, which is in the form of an inverse K-shape. Meanwhile, the finite element analysis software ABAQUS was used to simulate the elasto-plastic behavior of the specimens of three groups of joints, and the cracks in the T-shaped columns were verified to be anti-K-shape under the low cyclic loading. Aiming at the design of such cracks, the mechanism and value of the main parameters in the damage plastic model are briefly described.