混合配筋预应力混凝土管桩抗剪性能试验研究

通过开展7根混合配筋预应力混凝土管桩和3根预应力混凝土管桩的抗剪性能试验，对比了两种预应力混凝土管桩的抗剪承载力，分析了非预应力钢筋和轴压力对抗剪承载力的影响。试验结果表明：配置非预应力钢筋提高了预应力混凝土管桩的抗剪承载力和抗剪刚度，施加轴压力可以明显提高预应力混凝土管桩的抗剪承载力。针对试验试件进行了有限元模拟，模拟结果与试验结果吻合良好。在试验与有限元分析结果的基础上，提出了修正的抗剪承载力计算公式，可以为混合配筋预应力混凝土管桩技术规程的编制工作提供依据。

EXPERIMENTAL STUDY ON SHEAR BEHAVIOR OF PRESTRESSED CONCRETE PIPE PILE WITH HYBRID REINFORCEMENT

A total of 7 prestressed concrete pipe piles with hybrid reinforcement (PRC pipe pile) and 3 prestressed concrete pipe piles (PHC pipe pile) were tested, hence the shear capacities of the two kinds of pipe piles were obtained. The influences of non-prestressed steel bars and axial compression were analyzed. It was indicated that introducing non-prestressed steel bars could increase the shear capacities and shear stiffness. Meanwhile, increasing the axial compression force would raise the shear capacities of pipe piles. The tests were simulated by finite element models and the numerical results were in a good agreement with the test results. Based on the obtained test and numerical data, a modified formula for calculating the shear capacities of PRC pipe piles has been proposed, which contributes to the establishment of the technical specification for the design of PRC pipe piles.