【摘要】 提出了一种新型叉桩节点的抗震性能试验方案,通过非线性有限元分析得到了叉桩节点的滞回曲线、骨架曲线、延性系数、割线刚度以及耗能能力;讨论了桩帽的配箍率、混凝土强度等级、轴压比以及桩芯配筋率等参数对叉桩节点抗震性能的影响。结果表明:桩帽配箍率、混凝土强度等级对叉桩节点的延性和耗能能力有较大影响,桩帽轴压比对叉桩节点的承载力、刚度、延性和耗能能力均有较大影响,配置桩芯钢筋可以明显提高叉桩节点的延性和耗能能力,但配置一定数量的桩芯钢筋之后,提高桩芯配筋率对叉桩节点的延性和耗能能力影响不大。所得结论对叉桩节点在低周反复加载下的抗震性能试验研究具有重要的参考价值。更多还原

【Abstract】 A test scheme on seismic behavior of a new batter pile joint was proposed.Hysteretic curve,skeleton curve,ductility coefficient,secant stiffness and dissipation capacity of the batter pile joint were obtained by using nonlinear finite element analysis.The influences of the stirrup ratio of pile cap,strength of concrete,axial load ratio and reinforcement ratio in the core of piles on seismic behavior of the batter pile joint were discussed.Results show that the stirrup ratio of pile cap and strength of concrete are important for the ductility and dissipation capacity of the batter pile joint,axial load ratio is important for the bearing capacity,stiffness,ductility and dissipation capacity of the batter pile joint.Certain reinforcement distribution in the core of piles can improve the ductility and dissipation capacity of the batter pile joint.After exceeding the requirement quantity of reinforcement,the ductility and dissipation capacity of the batter pile joint change a litter through enhancing the reinforcement ratio in the core of piles.The conclusions have important reference value for seismic behavior test of the batter pile joint under low cyclic loading.更多还原