PHC管桩抗弯承载力研究

Research on bending capacity of PHC pipe pile

针对支护用预应力混凝土管桩抗弯承载力低的特点,文章通过足尺模型试验对管桩的抗弯性能进行研究,并运用有限元软件ANSYS建立管桩模型,对试验进行数值模拟。结果表明,试验管桩的抗弯性能明显优于规范值,管桩达到极限状态时没有明显的塑性变形。有限元分析结果显示,采用理想线弹性的本构关系,以预应力钢筋屈服作为管桩达到极限状态的标志,可以得到较为准确的结果。

Aiming at the low bending capacity of pre-stressed concrete supporting pipe pile, the bending capacity of the pipe pile was studied through a full scale model test and the pipe pile model was built by using the finite element software ANSYS to conduct the numerical simulation of the test. The results show that the bending capacity of the test pile is better than the standard value, and the pile reaches limit state without obvious plastic deformation. The results of the finite element analysis show that an accurate result can be gotten by using the ideal linear elastic constitutive relation of con- crete and using the yield of pre-stressed steel as a symbol of reaching limit state of the pile.