钢管混凝土拱桥收缩徐变的有限元分析

FEM Analysis of the Creep and Shrinkage in CFST Arch Bridge

采用大型通用有限元软件ANSYS计算钢管混凝土拱桥拱肋混凝土的收缩徐变量值,将计入混凝土收缩徐变前后的拱桥内力与应力值进行比较,分析混凝土收缩徐变对结构变形的影响,得出了钢管混凝土拱桥收缩徐变的规律:混凝土的收缩徐变使钢与混凝土之间的内力与应力发生了明显改变,引起钢管应力增加。

The creep and shrinkage of concrete in concrete filled steel tubular (CFST) arch bridge was simulated by finite element method (FEM). The internal force and section-stress of the arch bridge with the creep and shrinkage of concrete were compared with those without the creep and shrinkage. The influence to the structure's transmogrification was analysized. The characteristic of the creep and shrinkage of concrete was indicated. The cross-stress redistribution is quite clear, the forces and the stress of the steel tuble increased but those of the concrete reduced because of the creep and shrinkage.