铰接杆系结构分批张拉的预应力形成

杆系结构后张预应力的形成，由于施工等因素有时需要采用分批张拉索来完成。本采用悬链线索元、空间杆元模型和同何非线性有限元理论，利用索原长变化量和索张力一一对应的关系，进行了分批张拉预应力的分析。简单算例表明以原长变化量为控制条件，结构能有、快速地张拉到设计预应力状态。

ANALYSIS FOR BATCH-PRETENSIONED HINGED STRUCTURES

The pretension of static determinate or indeterminate hinged structures is often obtained by batch stretching the external cables. The mutual influence caused by batch pretensioned cables makes the analysis rather complex. In this paper, with the application of the catenary cable element and space truss element and nonlinear FEM method, the problem can be effectively solved by controlling the variation original length of cables instead of the design tension. Finally, a simple example definitely proves this conclusion.