后张法预应力混凝土长管节管桩抗弯性能研究

后张法预应力混凝土长管节管桩是采用离心工艺制作而成的单管节长度为8 m及以上的混凝土管桩,在港口工程桩基领域具有突出的优势。为研究其力学抗弯性能,通过对1 400 mm长管节管桩的抗弯性能进行理论分析,并对其管节和接头进行抗弯性能试验,监测加载过程中的变形和破坏情况。结果表明,长管节管桩的抗弯性能与其混凝土强度等级、张拉控制应力及预应力损失有较大关系;由于长管节管桩生产采用双层端模、分批张拉等工艺,使其具有优越的抗弯性能,是一种适用于沿海工程的高性能桩型,有广泛的应用前景。

Bending property of post-tensioning prestressed concrete long tubular section cylinder pile

Post-tensioning prestressed long tubular section concrete pile is made by centrifugal technology and single tubular section with the length of 8 m or more,which has outstanding advantages in the field of port engineering pile foundation.In order to study its mechanical bending property,we analyze the bending property of 1400 mm diameter long tubular section pile,carry out the bending property tests of its tubular section and joints,and monitor the deformation and failure during loading.The results show that the bending property of long tubular section pile is closely related to its concrete strength grade,tension control stress and prestress loss.The production technologies of double-layer end die and graded tension make the new tubular pile have superior bending property.It is a cost-effective pile type suitable for coastal engineering and has wide application prospects.