方钢管混凝土穿芯高强螺栓-端板节点滞回性能研究

对3个方钢管混凝土柱穿芯高强螺栓-端板节点试件进行了伪静力试验研究。采用有限元程序ANSYS对节点进行了循环荷载作用下的三重非线性有限元分析,研究了轴压比、混凝土强度、高强螺栓预拉力、端板厚度及端板加劲肋等因素对节点滞回性能的影响。结果表明,轴压比和混凝土强度对节点滞回性能影响较小,减小高强螺栓预拉力将显著降低节点的耗能能力,端板加劲肋和端板厚度对节点性能有明显的影响,但设置加劲肋比增加端板厚度对改善节点性能更有效。试验与计算结果表明,穿芯高强螺栓-端板节点具有很好的强度、刚度、延性和耗能能力。

Hysteretic Behavior of High Strength Bolts-End Plate Connections for Concrete Filled Square Steel Tubular Columns

A new configuration of high strength bolts-end plate connections for linking concrete filled square steel tubular columns and steel beams was proposed.Pseudo-static experiments on 3 specimens of this new type of connections had been conducted.The nonlinear finite element analysis involving geometric,material and contact nonlinearities were presented using the ANSYS finite element package.The influences of the axial load ratios,the strength of concrete,the pre-tensioning force of high strength bolts,the thickness of endplate and the stiffening plate of end plate on the hysteretic behavior of the connections were systematically studied.The results obtained from the finite element analysis showed that the axial load ratios and the strength of concrete have little influence on the hysteretic behavior of the connections,and the decrease of the pre-tensioning force of high strength bolts reduces considerably the energy dissipation capacity of the connections.However the thickness of endplate and the stiffening plate have remarkable effect on the hysteretic behavior,and the stiffening plates of end plate are more effective than the increase of the thickness of end plate for improving the behavior of the connections.The results obtained from the finite element analysis and the experiments revealed that the connections have excellent strength,stiffness,ductility and energy dissipation capacity.