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通过9个型钢混凝土L形柱空间角节点模型试件的低周反复加载试验,以揭示该类节点的抗震性能指标.观察了其破坏过程及形态、得到荷载-位移滞回曲线、骨架曲线及特征点参数等抗震性能指标,并对柱截面配钢形式、轴压比、加载角度以及连接梁的结构形式4个变化参数对抗震性能的影响规律进行了深入分析.结果表明:型钢混凝土L形柱空间角节点发生了伴随扭转的节点核心区破坏;滞回曲线饱满、位移延性系数较大、耗能能力强;强度、刚度衰减退化过程缓慢,表现出较好的抗震性能.
Through the low-cycle repeated loading test of nine steel reinforced concrete L-shaped columns, the seismic performance of the joints was revealed, and the failure process and morphology of the joints were observed. The load-displacement hysteresis curve, The parameters of seismic performance such as the characteristic parameters of the steel, and the effect of the four parameters on the seismic performance of the column section with the steel form, the axial compression ratio, the loading angle and the structural form of the connecting beam are analyzed in depth.The results show that: The core-zone failure of the node with the torsion occurred in the column space angular node. The hysteretic curve is full, the displacement ductility coefficient is large, and the energy dissipation capacity is strong. The strength and stiffness attenuation and degradation processes are slow and show good seismic performance.