预应力填芯管桩抗弯性能与延性特征的试验

在水平地震作用下,管桩与桩帽接合部要承受较大的弯矩和剪力的作用,现有的管桩标准图均在管桩顶部1m范围内按构造的要求设置填芯混凝土以提高空心管桩的承载能力,改善桩端延性,但目前对填芯混凝土管桩承载力和延性的了解甚少。通过对两组试件在低周反复荷载作用下的试验,研究填芯桩与非填芯桩的抗弯性能和延性特征。试验表明,填芯管桩的截面延性系数和抗弯承载能力均较非填芯管桩截面有较大的提高。

TEST OF MOMENT BEARING CAPACITY AND DUCTILITY PERFORMANCE OF FILLED PRESTRESSED CONCRETE PIPE PILE

Under the horizontal earthquake action, the jointed region of a pipe pile with base platform subjected to large moment and shear force. According to the technical standard of prestressed concrete pipe pile, the reinforced concrete are filled in the upper pile for one meter to improve the ductility and enhance bearing capacity. But the bearing capacity and ductility of filled prestressed concrete pipe pile are rarely known up to now. Two specimens were tested in low-cycle reverse loads to investigate the momen bearing capacity and ductility performance for both filled pile and unfilled one. The tests show that the ductility factor of section and the moment bearing capacity of the filled pipe pile have larger improvement as compared with those of the unfilled one.