Simulation Study On Corrosion Expansion Of Reinforced Concrete Structures

Reinforced concrete structures are widely applied in various engineering fields. However, reinforced corrosion can cause damage to the reinforced concrete structures. Eventually it causes huge economic losses and casualties. The study of corrosion reinforced concrete structures damaged is increasingly concerned by engineering.After reinforced corrosion, the volume that corrosion product is larger than the original volume. The reinforced will expand, which will press its surrounding concrete. The pressure is namely expansion force. Until expansion force reaches a certain extent, it will produce concrete cracks. With the expansion force increasing, the cracks will run through the protective. At last the reinforced concrete will be destroyed. So it is very meaningful to study in the Expansion Force at the time of splitting. Establish a similar model with the theoretical model by using the finite element software. And the calculated results are compared with the theoretical model results verified. So it is feasible to use computer software simulating the corrosion damage of reinforced concrete structures.In this paper, the finite element software is used to establish to a cross-sectional model of reinforced concrete structure. By changing the rational model parameters, value of concrete cover cracking moment is calculated and analyzed. Then the factors of the concrete cracking are found out. The study found that the expansion force is proportional to the tensile strength of concrete, the thickness of the protective layer, reinforce spacing. And the expansion force is inversely proportional to the reinforce diameter. Then observe and analyze the distribution of concrete cracks at different expansion force load. The study found that the relative thickness of the protective layer (C/d) is related to the direction of cracks. The reinforced concrete structures whose rebar is in the angular position are more easily broken than the structures whose rebar is in the middle position. By the influence of stress superposition, the reinforced concrete structures which have a plurality of rebar are more easily broken than the structures which have only one rebar. Finally, the value of expansion force is gotten when the structures suffer permanent external loads. Mathematical software is used to fit the results. At last relationship that expansion force and external loads is found.