混凝土等建筑材料由于其本身的结构特性 ,在不受力的自然状态下就存在天然的损伤 ,如孔洞、微裂纹等。本文阐述了这类材料细观特征及塑性力学特性。采用多孔材料的GTN (Gurson -Tver gaard -Needlemen)模型本构方程 ,在变形梯度的乘法分解的基础上 ,推导和建立了细观力学分析的弹塑性有限变形计算方法 ,说明运用细观损伤力学方法分析是必要的和可行的。 Concrete and other building materials due to its own structural characteristics, in the absence of force in the natural state of existence of natural damage, such as holes, micro-cracks. This article describes the meso-characteristics and plasticity properties of these materials. Based on the constitutive equation of GTN (Gurson -Tver gaard-Neelemen) model of porous material, the calculation method of finite deformation of the elasto-plastic deformation in the meso-mechanics analysis is deduced and established based on the multiplication deformation of the deformation gradient. Methodological analysis is necessary and feasible.