预应力混凝土靠船桩变形性能试验研究

Test Research on Deformation Ability of Prestressed Concrete Berthing Piles

通过4根后张预应力混凝土靠船桩的室内试验,并结合有限元分析计算,研究了初始预张拉应力、混凝土强度、配筋率等对靠船桩的变形性能、裂缝及其闭合情况的影响.研究结果表明,采用高强度材料的预应力混凝土靠船桩具有良好的变形能力和裂缝闭合性能.实际应用此项技术时,建议混凝土强度取C60～C80;混凝土取高强度时,初始预张拉应力取规范规定的下限值,反之取上限值.

On the basis of laboratory test results,the authors studied the effect of initial tensile stress,concrete strength and the ratio of reinforcing bar on the deformation ability and the cracking property of PCBP(prestressed concrete berthing pile).Test results showed that the PCBP with high strength material had good deformation ability,and that cracks could close when unloaded.The authors suggest that the concrete strength should be range from C60 to C80 and the initial tensile stress should accord to the concrete strength in the final part of this paper.