钢管混凝土劲性骨架拱桥收缩徐变影响理论研究

Theoretical Analysis of Creep and Shrinkage Effects in SRC Arch Bridge

采用混凝土徐变理论、变形协调、中值理论及平衡条件 ,并考虑混凝土的弹性后效及受四周约束作用的徐变特性 ,导出了混凝土徐变、收缩引起的截面应力重分布的表达式。公式简单 ,应用方便 ,并对万县长江大桥收缩、徐变模型试验进行分析 ,所得结果与模型试验较为吻合 。

In this paper, the concrete creep theory, compatibility equations, median theory and equilibrium conditions are used and the elastic aftereffect of concrete and creep shrinkage features of concrete restrained all around are considered to develop formulae of cross-section stress redistribution resulted from concrete creep and shrinkage The formulae which are simple and convenient to use are applied to Wanxian Changjiang Bridge (420 m in span) for the model test analysis of creep and shrinkage The obtained results are compared with those of model test and the agreement between them is very good The main factors to affect the stress of this type of bridge are indicated