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通过4个1/2比例的钢管混凝土分叉柱与钢梁连接节点的拟静力试验,对其滞回性能、刚度退化、延性性能、耗能能力以及破坏特征进行了研究与分析,并与纤维杆元模型模拟的结果进行了比较。结果表明:节点在梁端塑性铰破坏模式下钢管混凝土树状节点的抗震性能较好;在局部焊接破坏模式下延性较低,抗震性能相对较差;钢管分叉柱长宽比较大时,设置纵向隔板能更好地保证节点区域的稳定性。
The quasi-static tests of four 1/2 ratio concrete-filled steel tubular bifurcated columns and steel beams are carried out, and their hysteretic behavior, stiffness degradation, ductility, energy dissipation capacity and failure characteristics are studied and analyzed. Fiber rod meta model simulation results were compared. The results show that the joints of concrete filled steel tubular decks have better seismic performance under the plastic hinged failure mode of beam ends, lower ductility and less anti-seismic performance under the local welding failure modes. When the length-width ratio of steel bifurcated columns is larger, Vertical partition can better ensure the stability of the node area.