Strain Softening Modeling of Concrete in the Post-Fracture Range

本课题旨在研究 应变软化塑性变形破坏模型 行为的混凝土材料在断裂后的范围;发展 混凝土三维应力-应变关系 基于涵盖广泛应力范围的理论研究 包括断裂后软化行为的条件;实施 将模型转化为三维非线性有限元分析 程序，并通过求解一些边值问题来验证程序 具有现实意义的问题。 在这项研究中，特别强调 将混凝土材料放在应变软化模型中， 断裂后范围，在应变空间的一般框架内 基于Ilyushin假设的塑性公式和 断裂理论 一个更一般的应变空间公式， 考虑到混凝土的塑性和断裂， 开发

In this project, it is intended to study the theoretical basis of strain-softening plasticity in modeling deformational and failure behaviors of concrete materials in the post-fracture range; to develop a comprehensive three-dimensional stress-strain relation for concrete based on the theoretical studies covering a wide range of stress conditions including the post-fracture softening behavior; to implement the model into a three-dimensional nonlinear finite element analysis program, and to verify the program by solving some boundary value problems of practical significance. In this study, special emphasis will be placed on strain-softening modeling of concrete material in the post-fracture range, within the general framework of strain-space formulation of plasticity based on Ilyushin's postulate and the fracture theory. A more general strain-space formulation, which accounts for both plastic and fracturing of concrete, will be developed.