混凝土斜裂纹损伤断裂分析

Damage and Fracture Analysis on Concrete with an Oblique Crack

混凝土构件中宏观裂纹尖端附近,伴随有损伤,随着损伤的发展,微裂纹集度不断增大,合并形成宏观裂纹.本文将Mazars混凝土损伤模型应用于混凝土断裂分析中.带斜裂纹的构件受拉应力作用时,将产生Ⅰ、Ⅱ型复合裂纹.本文分析了宏观裂纹尖端附近区域的损伤,所得结果与最大拉应力理论的结果比较相符.

There is damage in area by a top of the macroscopic crack in a concrete structural member.In pace with development of damage,density of microscopic cracks continuously grow and the microscopic cracks (combine) a macroscopic crack.Mazars' concrete damage model is applied to concrete fracture in this paper.When a structural member with an oblique macroscopic crack bears a tow stress,Ⅰ and Ⅱ model mixed crack come into being.Damage in area by a top of the macroscopic crack is analysed in this paper.Analytic result approximately equals the result of maximum tow stress theory.