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本文在运用概率方法确定了混凝土材料的初始损伤门槛值εＤ的前提下采用已有内时损伤本构模型，利用有限元方法对单边切口混凝土梁在三点弯曲荷载和四点剪切荷载作用下的力学行为进行了分析，计算了所有试件的极限荷载Ｐｍａｘ，运用计算结果对混凝土断裂力学参数的尺寸效应规律进行了分析，并与已有试验结果进行了比较，其结果表明本文的数值分析与试验结果以及其它方法的分析结果吻合较好
In this paper, using the probabilistic method to determine the initial damage threshold value εD of concrete materials, the existing inner-time damage constitutive model is adopted and the finite-element method is used to effect the three-point bending load and four-point shear load of the single-edged concrete beam. The following mechanical behaviors were analyzed, the ultimate load Pmax of all specimens was calculated, and the size effect law of the fracture mechanics parameters of the concrete was analyzed using the calculation results, and compared with the existing experimental results. The results showed that the value of this paper The analysis results agree well with the test results and other methods