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为研究混凝土的楔入劈拉断裂特性,采用扩展有限元法数值模拟了不同缝高比、不同截面高度的混凝土楔入劈拉试件断裂过程,研究了混凝土楔入劈拉试件裂缝扩展特性和尺寸效应。结果表明,起裂韧度受初始缝高比和试件截面高度的影响较小,但不具有明显的尺寸效应;当缝高比大于0.5或截面高度大于500mm时,失稳韧度才不具有尺寸效应。结果可为混凝土断裂特性研究提供参考。
In order to study the wedge splitting tensile fracture behavior of concrete, an extended finite element method was used to numerically simulate the fracture process of concrete wedged splitting tensile specimens with different seam height ratios and different cross-sectional heights. And size effect. The results show that the initial fracture toughness is less affected by the initial fracture height ratio and specimen section height, but does not have obvious size effect. When the fracture height ratio is greater than 0.5 or the section height is greater than 500 mm, the instability toughness does not have Size effect. The results can provide a reference for the study of the fracture characteristics of concrete.