钢筋内约束特性及其对收缩应力的影响

Internal Constraint Characteristics of Reinforcing Steel Bar and Its Impact on Shrinkage Stress

建立较能全面描述钢筋混凝土约束关系的力学模型,引入力平衡和变形协调条件,研究钢筋内约束特性对收缩应力的影响,指出了现有收缩应力计算方法的不足之处,并揭示出钢筋内约束系数随配筋率增大而线性增大的变化规律。

A mechanical model is built up to comprehensively descript the constraint relation of reinforcement concrete. The force equilibrium and deformation compatibility conditions are introduced to study the effects of internal constraint effect of reinforcing steel bar on shrinkage stress. It also points out some shortcomings of the current contraction stress calculation methods and deduces that the internal constraint effect of reinforcing steel bar linearly increases with reinforcement ratio.