基于断裂力学和损伤理论的混凝土开裂模型.pdf

45 5 浙 江 大 学 学 报() Vol.45 o. 5 2011 5 Journal of Zhejiang University ( Engineering Science) May. 2011 DOI: 10.3785/j.issn. 1008-973X.2011. 05.029 蒋梅玲, 金贤玉, 田 野, 金南国 ( , 310058) : , . , , . , ABAQUS . , . , . , , . : ; ; ; ; : TU 528.01 : A : 1008-973X(2011) 05-948-06 New concrete cracking model established based on fracture mechanics and damage theory JIA G Me-i ling, JI Xian-yu, TIA Ye, JI an-guo (Dep artment of Civ il Eng ineering , Zhej iang University , H angzhou, 310058 , China) Abstract: According to macro-fracture mechanics and meso-damage theory, the influence of fracture process zone on the fracture toughness of concretewas studied. Based on two-parameter model, the meso- damage constitutive model was employed to represent the stress distribution of the macro fracture process zone. And an improved cracking model of concrete was established. Based on mechanical tests, the frac- ture processes of concrete beams with different pre-crack depth at different ages were simulated using S ABAQUS. T he numerical simulation results indicate that both critical stress intensity factor ( K IC) and crack tip opening displacement (CT OD) increase with the increase of curing age. While at the same age, S the initial crack depth has no clear influence on KIC and CT OD. It is found in this research, using the im- proved cracking model, thenumerical simulation results agreewell with the experimental results. It proves that the improved model can accurately describethe critical cracking behavior of concrete, and be applied to evalu