混凝土结构收缩应力问题研究

Study on Drying Shrinkage and Creep of Concrete Structures

扼要阐述了混凝土干缩变形及其分析方法 ,采用两种方法研究混凝土干缩应力的变化规律 .对于估算法 ,其结果比较可靠 ,而计算湿度场方法仅仅是处于探讨阶段 .当考虑混凝土干缩作用时 ,结构的应力值要大于不考虑干缩的影响 ,特别是对于薄壁或薄板结构 .通过有限元仿真 ,对上海地铁地下车站混凝土框架结构的干缩应力进行了计算 ,在一定程度上揭示了结构干缩应力的变化趋势 .

Some methods are introduced for analysis of drying shrinkage and creep of concrete structures. Two methods are adopted for research of the variation of shrinkage stress of concrete. The result of the estimation method is reliable, while the method of humidity field calculation is still under study. The stress value, in consideration of the influence of concrete shrinkage, should be larger than the value without consideration of the influence. Based on FEM simulation, the drying shrinkage stress of the structural frame of the Shanghai Metro Station is calculated, and the trend of variation of drying shrinkage stress is revealed to a certain extent.