张秀芳, 徐世烺. 权函数法计算的混凝土断裂韧度[J]. 工程力学, 2011, 28(4): 58-062,.
引用本文: 张秀芳, 徐世烺. 权函数法计算的混凝土断裂韧度[J]. 工程力学, 2011, 28(4): 58-062,.
ZHANG Xiu-fang, XU Shi-lang. FRACTURE TOUGHNESS OF CONCRETE DETERMINED USING WEIGHT FUNCTION APPROACH[J]. Engineering Mechanics, 2011, 28(4): 58-062,.
Citation: ZHANG Xiu-fang, XU Shi-lang. FRACTURE TOUGHNESS OF CONCRETE DETERMINED USING WEIGHT FUNCTION APPROACH[J]. Engineering Mechanics, 2011, 28(4): 58-062,.

权函数法计算的混凝土断裂韧度

FRACTURE TOUGHNESS OF CONCRETE DETERMINED USING WEIGHT FUNCTION APPROACH

  • 摘要: 在采用解析方法确定混凝土的双K断裂韧度时,粘聚断裂韧度计算的准确性直接影响起裂韧度断裂控制参数计算的准确性。根据权函数法,给出了基于CEB-FIP粘聚应力软化函数计算的粘聚断裂韧度的表达式。使用最大高度为1000mm的五组楔入劈拉紧凑拉伸试件测量的最大荷载和临界裂缝嘴张开口位移,计算了混凝土的双K断裂韧度,并与积分解析计算公式进行了对比。结果表明,两种解析计算方法较为吻合,最大误差不超过2%。

     

    Abstract: When the analytical approach is adopted to determine the double-K fracture toughness of concrete, the accuracy of the calculated fracture governing parameter, i.e., the initiation fracture toughness, is directly influenced by the accuracy of the calculated cohesive fracture toughness. An expression for calculating cohesive fracture toughness, where a tension softening relationship determined using CEB-FIP Mode Code is assumed, is developed in the present paper based on the weight function approach. Using the measured maximum loads and critical crack mouth opening displacements of five groups of wedge splitting compact tension specimens of which the maximum depth is 1000mm, the double-K fracture toughness parameters are then evaluated using the developed expression and compared with the values calculated using the analytical integral approach. The results show that two different approaches agree well and the maximum error between them is less than 2%.

     

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