混凝土非线性断裂及随机损伤耦合机理研究

项目名称： 混凝土非线性断裂及随机损伤耦合机理研究

项目编号： No.51309073

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 水利工程

项目作者： 卿龙邦

作者单位： 河北工业大学

项目金额： 25万元

中文摘要： 混凝土断裂破坏历经损伤演化、裂缝产生与扩展等阶段。鉴于裂缝尖端材料存在随机损伤演化过程，裂缝的扩展与材料损伤演化就具有耦合性质。本项目拟采用理论分析、数值模拟和典型试验相结合的手段，对混凝土非线性断裂及随机损伤耦合机理进行深入研究。拟建立混凝土断裂与随机损伤演化的耦合理论，发展基于随机力学的混凝土断裂损伤耦合模型，通过试验量测混凝土断裂过程区应变场及损伤场，验证所提理论与模型的适用性与可行性。进一步，以允许损伤尺度为判别准则，研究基于随机损伤与断裂耦合的混凝土裂缝产生与扩展的数值分析方法，研发混凝土断裂损伤全过程分析系统。课题立足于对混凝土裂缝起裂与扩展理论的有益发展与完善，研究成果可应用于混凝土大坝的实际断裂破损分析中，为混凝土大坝施工期与运行期的裂缝问题的安全性评判提供科研依据。

中文关键词： 大坝混凝土；非线性断裂；随机损伤；耦合；允许损伤尺度

英文摘要： The fracture of concrete includes the processes of damage evolution, crack generation and growth, etc. In view of the stochastic damage evolution in front of the crack tip, crack propagation and material damage evolution are coupling. By multiple means of theoretical analysis, numerical simulation and typical experiments, the project plans to in-depth study the coupling mechanism of the nonlinear fracture and stochastic damage of concrete. A theoretical model for the coupling fracture and stochastic damage of concrete will be developed and verified by tests where strain and damage in fracture process zone will be measured. Furthermore, an analysis system for the whole fracture process of concrete will be developed by adopting the permissible damage scale as a criterion and based on the numerical study of crack generation and growth for coupled stochastic damage and fracture of concrete. The project will shed light on the development and improvement of the theory for concrete fracture initiation and expansion. And the research results can be applied to analyze the fracture of concrete dams in practice and provide the safety evaluation basis for the cracks of concrete dams during construction and operation periods.

英文关键词： dam concrete；nonlinear fracture；stochastic damage；coupling；permissible damage scale