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为研究采用穿芯高强螺栓-端板节点的方钢管混凝土框架的抗震性能,基于一榀两层两跨方钢管混凝土框架的拟静力试验研究结果,利用有限元软件ABAQUS对试验试件进行了非线性数值分析。研究框架的破坏机制、延性、耗能能力及节点性能。在峰值荷载前,数值分析结果与试验结果吻合较好。对轴压比、节点端板厚度、加劲肋厚度以及高强螺栓预拉力等因素进行了分析。结果表明,框架滞回曲线饱满,具有良好的延性和耗能能力,节点在加载过程中未产生塑性变形。当框架柱的轴压比较小时,可形成理想的梁铰破坏机制。增大端板厚度和设置梁端加劲肋可提高结构的刚度与承载力,使框架刚度的退化趋于平缓。高强螺栓预拉力对框架性能无显著影响。
In order to study the seismic behavior of concrete-filled square steel tube (CFST) frame with core-penetrating high-strength bolt-end plate joints, based on the results of pseudo-static test of one-two two-span two-span CFST frames, the finite element software ABAQUS Nonlinear numerical analysis. Research framework of the damage mechanism, ductility, energy consumption and node performance. Before the peak load, the numerical analysis is in good agreement with the experimental results. The axial compression ratio, the thickness of the end plate, the thickness of the stiffener and the prestress of the high strength bolt were analyzed. The results show that the hysteresis curve of the frame is full, with good ductility and energy dissipation. The node does not produce plastic deformation during loading. When the frame column axial pressure is relatively small, can form the ideal beam hinge damage mechanism. Increasing the thickness of the end plate and setting the stiffener at the beam end can increase the rigidity and bearing capacity of the structure, so that the degradation of the frame stiffness tends to be gentle. Prestressing of high strength bolts has no significant effect on frame performance.