矮塔混凝土斜拉桥成桥索力优化研究

在研究一般斜拉桥成桥索力优化方法的基础上,针对矮塔混凝土斜拉桥结构受力特点,依据影响矩阵调值原理,提出了以结构整体弯曲能量最小为目标、以主梁主塔单元的弯矩和轴力以及部分关键节点的位移为约束条件的矮塔混凝土斜拉桥索力优化方法。应用MIDAS/CIVIL2010＂未知荷载系数＂模块,对某混凝土矮塔斜拉桥实际工程进行成桥索力优化。分析结果表明,此种方法可以方便得到满足设计要求的合理成桥索力。

Study of cable force optimization of completed low-pylon cable stayed concrete bridge

On the basis of in studying the method of cable force optimization of completed common cable stayed bridge,aiming at the stress characteristics of low-pylon cable stayed concrete bridge structure,according to influence matrix tone pitch theory,the method of cable force optimization of low-pylon cable stayed concrete bridge that takes minimum bending energy in whole structure as its target,and references the bending moment and axial force of unit of main beam and tower and the displacement of part key nodes as the constrain conditions is proposed.This paper uses MIDAS/CIVIL2010 "unknown load factor" module to do cable force optimization of the low-pylon cable stayed concrete bridge project.The analysis results show that this method can get reasonable completed cable force that meets design requirement easily.