确定斜拉桥施工张拉力的影响矩阵法

斜拉桥是由塔、梁、索三种基本构件组成的缆索承重结构,拉索具有可调性.设计斜拉桥时,一般先对其成桥状态进行索力优化,得到设计索力,再根据施工方案确定拉索在施工阶段的张拉力,这种张拉力将保证斜拉桥在成桥时实现设计索力,称为施工张拉力.文章在充分讨论现有算法的基础上,导出了确定斜拉索施工张拉力的影响矩阵法,同时给出了计入砼徐变、收缩、结构几何非线性影响,求解施工张拉力的迭代方法.该方法可以彻底取代传统施工张拉力的计算方法.

Influence Matrix Method Determining Construction Cable Tensions for Cable-stayed Bridges

A cable-stayed bridge is a type of cable-supported structure composed of towers, beams and cables, and the cable tensions are adjustable. During the design, the reasonable cable tensions are generally obtained by optimization in completion. The cable tensions under construction called construction cable tension, which will ensure the reasonable cable tensions to be achieved in completion, are determined by construction design. Due to the complexity and diversity of construction process and the shrinkage and creep of concrete structure, construction cable tension is difficult to be obtained using traditional backward analysis method. In this paper, influence matrix method to acquire construction cable tension is developed. The iterative method considering the influence of shrinkage, creep and nonlinear of structure is realized. The method can take place of the traditional methods to calculate initial-cable-tension.