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根据混凝土材料断裂过程区存在尺寸效应这一特点,结合断裂韧度尺寸效应公式对混凝土有效裂缝扩展长度做了相应的研究,得到了基于尺寸效应规律的有效裂缝扩展长度的表达式。运用该公式对已有试验资料进行分析比较,得出此公式适用于单直线软化模型,不适用于双直线软化模型的结论。
According to the characteristic of size effect in the fracture process of concrete, the effective crack propagation length of concrete is studied based on the size effect formula of fracture toughness, and the expression of effective crack propagation length based on the rule of size effect is obtained. Using this formula to analyze and compare the existing experimental data, it is concluded that this formula is suitable for the single linear softening model and not applicable to the double linear softening model.