【摘要】 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。更多还原

【Abstract】 This study is based on the experimental results of a two-story two-bay composite frame under cyclic loading, built to study the seismic behavior of square concrete-filled steel tube frame with through bolt-end plate joints. The nonlinear numerical analysis was conducted using the finite element software(FES) ABAQUS to analyze the failure mechanism, ductility, energy dissipation and connection behavior of this structure. Before maximum load, reasonable agreement was observed between the analysis results and experimental ones. Considering different parameters, including axial compression ratios, the thickness of end plates, beam stiffeners, and the pre-tension of high strength bolts, the mechanical performance of frames was investigated. The results show that the hysteresis curves of the frame are stable, and the frame has excellent ductility and energy dissipation capacity. The joints have no plastic deformation during the loading procedure. When the axial compression ratio is low, the failure mechanism of frame is acceptable. Increasing the thickness of the end plates and providing beam stiffeners increase the stiffness and ultimate load, and postpone the decrease of stiffness. The pre-tensioning of high strength bolts has no influence on the behavior of frame.更多还原