预应力锚索桩设计与计算

为进一步完善预应力锚索桩的设计与计算理论，节约工程投资，较为准确地确定锚索桩锚索预应力值及锚索桩设计计算控制条件，采用分段计算法和地基系数法，根据悬臂梁挠曲变形理论和弹性地基梁理论，计算预应力锚索桩锚索与桩变形协调时桩的变形与内力，以控制桩锚固面处变形及改善桩身内力分布来设计计算锚索桩径、锚索预应力值及锚索长度。按桩身内力变化，采用极限状态法，以正负弯矩对桩进行双面配筋。经过多处工程实践，该设计计算理论能较好地反映现场实际情况。

DESIGNING AND CALCULATING PRESTRESSED ANCHOR CABLE-PILE

In order to improve the theory of design and calculation about prestressed anchor cable-pile, save the cost of the project and determine the prestressed anchor cable-pile, according to the theorie of flexural strain on cantilever beam and beam on elastic foundation, the dividing-segment method and the method of subgrade reaction coefficient are used to calculate the strain and internal force of a pile when the deformation between the prestressed anchor and the pile reaches concordance. The deformation of the anchor cable pile is controlled and the internal force distribution along the pile is improved, so as to determine the anchor cable-pile radius, the prestressed value and anchor length. According to the variation of the pile's internal force, the methods of limiting state is used to make bilateral reinforcement through bending moment. Several successful cases show that the above approach is valid for practical use.