混凝土三维复合型断裂准则的研究

Researches on Criterion of Three-Dimensional Mixed Mode Fracture for Concrete

本文用杂交有限元法计算了试件的应力强度因子 ,并设计了混凝土试件的三维复合型断裂试验方案 ,断裂试验采用单边和环形裂缝梁型试件和圆柱形试件。对全部试验结果进行整理和分析后 ,用数理统计的多元回归法得到混凝土的三维断裂准则。

Stress intensity factors of specimens are calculated by a mixed hybrid finite element method. The three dimensional mixed mode fracture test plans are put forward in which unilateral crack and ring type crack specimens are used in the test and the latter deals with mode Ⅲ fracture. Twenty five test results are collated and calculated so as to get test regression surface of concrete, which is critical fracture surface of concrete or criterion of three dimensional mixed mode fracture for concrete.