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基于应变分解法，将开裂后的混凝土应变分解成裂缝面的应变与完好混凝土应变两部分，裂缝面上混凝土法向刚度取单轴受拉混凝土应力应变曲线的下降段刚度，并保留裂缝面的剪切刚度以考虑骨料咬合与销栓作用，完好混凝土本构关系采用弹塑性本构模型，推导了混凝土三维非正交弥散裂缝模型的基本公式．算例表明，该模型可用于混凝土结构的开裂分析，且分析结果和试验结果较为吻合．
Based on the strain decomposition method, the cracked concrete strain is decomposed into two parts: the strain of the crack surface and the strain of the intact concrete. The normal stiffness of the concrete on the crack surface takes the descending section stiffness of the stress-strain curve of the uniaxial tensioned concrete and keeps the fracture surface Shear stiffness is taken into account of the action of aggregate occlusion and pinning. The elastoplastic constitutive model of intact concrete constitutive relation is adopted, and the basic formula of three-dimensional non-orthogonal dispersion crack model of concrete is deduced. The example shows that the model can be used to analyze the cracking of concrete structure, and the analysis results are in good agreement with the test results.