混凝土三维非正交弥散裂缝模型

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，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。

Three-Dimensional Non-Orthogonal Smeared Crack Model for Concrete

Based on the method of strain decomposition in which the total strain increment of cracked concrete is decomposed into an intact concrete strain increment and a crack strain increment,the basic formulations of 3D non-orthogonal smeared crack model for concrete are derivated.The stiffness in the normal direction of cracking surface is equal to the decending stiffness of axial tensile stress strain curve of concrete.A shear modulus is retained to account for the interlock of aggregates and dowel action.Elastoplastic constitutive relationship is applied to intact concrete.This model has been applied to the analysis of an RC beam,and its adaptability to cracking analysis of concrete structures has been justified.