Abstract
In order to study the influence of corrosion rate and shear span ratio on reinforced concrete beam, a numerical analysis method of corroded reinforced concrete beam was put forward. Bond-slip relationship formula between reinforcement and concrete was suggested. A three-dimensional finite element model of corroded reinforced concrete beam was established. Calculation method of ultimate bearing capacity for reinforced concrete beam was suggested. Ultimate bearing capacity experiment on 14 corroded reinforced concrete beams with different corrosion rates and shear span ratios was carried out. Numerical analysis results and experimental results were compared and analyzed. The results show that, for reinforced concrete beams with different corrosion rates and shear span ratios, load-deflection curve can be divided into elasticity stage and plasticity stage. With the increase of corrosion rate and shear span ratio, ultimate bearing capacity of corroded reinforced concrete beam decreased. When shear span ratio was 3.0, if corrosion rate increased by 1%, experimental value of ultimate bearing capacity decreased by 1.002 kN. When shear span ratio was 2.4, if corrosion rate increased by 1%, experimental value of ultimate bearing capacity decreased by 1.849 kN. The numerical analysis method put forward in this paper was feasible, and the suggested ultimate bearing capacity calculation method for reinforced concrete beam has a high accuracy.
Highlights
Corrosion is an important disease of reinforced concrete structure; it can weaken performance of steel bars [1] and reduce bond-slip property [2,3,4,5] between reinforcement and concrete, which seriously threatens durability and safety of reinforced concrete structures
Influence of corrosion rate and shear span ratio on reinforced concrete beam was studied in this paper
Main results and conclusions were as follows: (1) For reinforced concrete beams with different corrosion rates and shear span ratios, load-deflection curve can be divided into elasticity stage and plasticity stage
Summary
Corrosion is an important disease of reinforced concrete structure; it can weaken performance of steel bars [1] and reduce bond-slip property [2,3,4,5] between reinforcement and concrete, which seriously threatens durability and safety of reinforced concrete structures. Experiment research is the main method to study corrosion of reinforced concrete structure; it has many advantages, such as high reliability, and it was easier to be recognized. Experiment research method was more consistent with actual corrosion situation. There were many defects regarding experiment research method, such as high cost, unknown factors, and error caused by simplified calculation. Results of experiment were wrong because of experiment error. Numerical analysis method has advantages of low cost, high repeatability, and accuracy, which can solve problems faced by experiment research method; it was of great scientific significance and engineering value to carry out numerical analysis of corroded reinforced concrete beams
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