The experimental results which were carried out by different researchers on corrosion of RCC beam were validated in ABAQUS. A finite element (FE) model similar to experimental condition was generated in ABAQUS. The mo...The experimental results which were carried out by different researchers on corrosion of RCC beam were validated in ABAQUS. A finite element (FE) model similar to experimental condition was generated in ABAQUS. The model with different percentages of corrosion and with varying load conditions was also generated. The deflections of RCC beam for different corrosion percentages and for varying load conditions were then validated. The model is then used to explore the effects of bar radial expansion, due to formation of corrosion products, on the cracking of cover concrete. The predictions are compared with tests results from reinforced concrete accelerated corrosion specimens. The aim of the analytical investigation was to reveal the mechanism for the development of concrete cracking due to corrosion of reinforcement. Further the finite element model will be used to explain qualitatively the experimentally determined relationship between amount of corrosion for concrete cracking and ratio of concrete cover to bar diameter, as well as that between reinforcement bond strength and amount of corrosion.展开更多
The corrosion of reinforcement in the concrete will cause the effective cross-sectional area of reinforcement to be weakened and the performance of reinforcement to change and lead to the degradation of the bond behav...The corrosion of reinforcement in the concrete will cause the effective cross-sectional area of reinforcement to be weakened and the performance of reinforcement to change and lead to the degradation of the bond behavior between reinforcement and concrete,which can seriously affect the mechanical properties of the structural elements.Therefore,it is of great practical significance to accurately simulate the corrosion morphology and the corrosion products of reinforcement.This paper improves the previous cellular automata models and establishes a new cellular automata model framework for simulating the random pitting corrosion process of reinforcement in concrete.This model defines the detailed local evolution laws of material transformation,penetration and diffusion processes during the corrosion.Meanwhile,based on the spatial inhomogeneity of corrosion,three parameters are introduced into the model:The dissolution probability parameter p,the local corrosion space parameterλand the local corrosion probability parameterε,which establishes a parameterized model of corrosion probability.The research results show that the common steel reinforcement corrosion morphology can be obtained by adjusting the parameters.The volume expansion rate of the corrosion products is about 2,which is consistent with the relevant experimental research results.The cellular automata model in this paper can simulate the common steel reinforcement corrosion morphology and corrosion products in engineering.展开更多
文摘The experimental results which were carried out by different researchers on corrosion of RCC beam were validated in ABAQUS. A finite element (FE) model similar to experimental condition was generated in ABAQUS. The model with different percentages of corrosion and with varying load conditions was also generated. The deflections of RCC beam for different corrosion percentages and for varying load conditions were then validated. The model is then used to explore the effects of bar radial expansion, due to formation of corrosion products, on the cracking of cover concrete. The predictions are compared with tests results from reinforced concrete accelerated corrosion specimens. The aim of the analytical investigation was to reveal the mechanism for the development of concrete cracking due to corrosion of reinforcement. Further the finite element model will be used to explain qualitatively the experimentally determined relationship between amount of corrosion for concrete cracking and ratio of concrete cover to bar diameter, as well as that between reinforcement bond strength and amount of corrosion.
基金The works described in this paper are substantially supported by the grant from National Natural Science Foundation of China(Grant No.51678135)Natural Science Foundation of Jiangsu Province(No.BK20171350)Six Talent Peak Projects in Jiangsu Province(JNHB-007),which are gratefully acknowledged.
文摘The corrosion of reinforcement in the concrete will cause the effective cross-sectional area of reinforcement to be weakened and the performance of reinforcement to change and lead to the degradation of the bond behavior between reinforcement and concrete,which can seriously affect the mechanical properties of the structural elements.Therefore,it is of great practical significance to accurately simulate the corrosion morphology and the corrosion products of reinforcement.This paper improves the previous cellular automata models and establishes a new cellular automata model framework for simulating the random pitting corrosion process of reinforcement in concrete.This model defines the detailed local evolution laws of material transformation,penetration and diffusion processes during the corrosion.Meanwhile,based on the spatial inhomogeneity of corrosion,three parameters are introduced into the model:The dissolution probability parameter p,the local corrosion space parameterλand the local corrosion probability parameterε,which establishes a parameterized model of corrosion probability.The research results show that the common steel reinforcement corrosion morphology can be obtained by adjusting the parameters.The volume expansion rate of the corrosion products is about 2,which is consistent with the relevant experimental research results.The cellular automata model in this paper can simulate the common steel reinforcement corrosion morphology and corrosion products in engineering.
