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提出了在预应力混凝土管桩中加入一定数量的非预应力钢筋的新型混合配筋预应力混凝土管桩的概念,以提高预应力管桩的抗弯承载力和延性。通过5根配有非预应力钢筋的混合配筋新型预应力混凝土管桩原型和2根普通预应力混凝土对比管桩的标准抗弯试验,研究了配置非预应力钢筋后的新型管桩的极限弯矩和刚度。基于混凝土规范和试验结果,建议了新型管桩抗弯承载力设计计算理论公式和用于管桩出厂检验的桩身极限弯矩检验值理论计算公式,均和试验结果符合良好,且满足管桩设计要求。提出了新型管桩开裂前和开裂后抗弯刚度的计算公式,和试验结果吻合良好。
The concept of a new type of hybrid prestressed concrete pipe piles with a certain amount of non-prestressed reinforced concrete prestressed concrete pipe piles is proposed to improve the flexural capacity and ductility of the prestressed concrete pipe piles. Based on the standard bending tests of five new prestressed concrete pipe piles with non-prestressed reinforced concrete and two ordinary prestressed concrete piles, the limit of the new type of pipe piles with non-prestressed reinforced concrete bars Bending moment and stiffness. Based on the concrete specification and the test results, the theoretical formula for calculating the flexural capacity of tubular pile and the theoretical calculation formula of the ultimate bending moment value of the pile for factory inspection are proposed, which are in good agreement with the test results and meet the requirements of the pipe pile Design requirements. The formulas for calculating the flexural rigidity of the new type of pipe before cracking and after cracking are presented, which are in good agreement with the experimental results.