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该文基于粘聚裂缝概念,以起裂韧度作为裂缝起裂和扩展的准则,提出了混凝土断裂过程区长度的计算方法。以Ⅰ型裂缝为例,计算了不同初始缝长和起裂韧度情况下的断裂过程区长度值,结合以往大体积混凝土的试验数据对其进行了验证。进而分析了断裂过程区长度的影响因素,结果表明:断裂过程区长度随初始缝长的增大而逐渐增大,随起裂韧度的增大而逐渐减小。
Based on the concept of cohesive fracture, this paper proposes a method for calculating the length of the fracture zone of concrete based on the fracture toughness as a criterion for fracture initiation and propagation. Taking type Ⅰ fracture as an example, the length of the fracture zone under different initial fracture lengths and fracture toughness was calculated, and verified with the experimental data of previous large-volume concrete. Furthermore, the influencing factors on the length of the fracture zone are analyzed. The results show that the length of the fracture zone increases with the increase of initial fracture length and decreases with the increase of fracture toughness.