CAJ | 학술논문

混凝土损伤模型的研究，实质上是研究损伤变量对混凝土材料本构关系的影响。在外界因素作用下，材料的累积变形引起结构内部损伤的发展，最终将产生宏观裂缝直至破坏。在混凝土损伤破坏过程中，“凹凸无序”的断裂面和“杂乱无章”的裂缝是对混凝土宏观力学性能离散化、非线性、随机性的最直接的体现和表征。基于断裂面和裂缝的分形特性，得到了分形应力、分形应变的基本概念，使之能更为准确地描述混凝土的宏观力学性能。通过 Najar 能量损伤理论，利用分形应力与表观应力、多重分形应变与表观应变之间的关系，推导得出了混凝土分形损伤本构模型，重新定义了 Weibull 概率分布的混凝土损伤扩展规律，得到了基于压缩变形分形特性的损伤演化方程。
혼응토손상모형적연구，실질상시연구손상변량대혼응토재료본구관계적영향。재외계인소작용하，재료적루적변형인기결구내부손상적발전，최종장산생굉관렬봉직지파배。재혼응토손상파배과정중，“요철무서”적단렬면화“잡란무장”적렬봉시대혼응토굉관역학성능리산화、비선성、수궤성적최직접적체현화표정。기우단렬면화렬봉적분형특성，득도료분형응력、분형응변적기본개념，사지능경위준학지묘술혼응토적굉관역학성능。통과 Najar 능량손상이론，이용분형응력여표관응력、다중분형응변여표관응변지간적관계，추도득출료혼응토분형손상본구모형，중신정의료 Weibull 개솔분포적혼응토손상확전규률，득도료기우압축변형분형특성적손상연화방정。
Concrete damage model research,in fact is the study of concrete material damage variables influence on its constitutive relationship.Cumulative deformation of material can cause interior damage of structure under exterior load so that the entire structure may collapse due to damage of concrete.In the process of concrete dam-age,the irregular fracture surfaces and wandering or disorderly cracks are the most direct embodiment and characterization for concrete mechanics performance discretization.In order to accurately describe concrete me-chanics performance,the conception of fractal stress、fractal strain and fractal fracture energy are obtained by the fractal characteristics of the fracture surface.According to energy dissipation damage theory by Najar,the uniaxial tensile fractal damage constitutive model is put forward by combining fracture mechanics with continu-um damage mechanics.By means of redefined damage propagation law of Weibull probability distribution,a new damage evolution equation considering the fractal characteristics of concrete fractures is proposed.