| In recent years, the durability of concrete structure has become a hot research field ofstructural engineering. The corrosion of steel is one of the principal factors which affectconcrete structure durability. As a result of corrosion，the cross section of steels will bewhittled down, the mechanical properties and the bond strength between bars and concretewill degradate. These factors adversely affect the mechanical properties of reinforced concretemembers. In recent years, experts and scholars at home and abroad carry out a lot of researchon flexural properties and shear properties of corroded beams by utilizing the method ofexperiment and numerical simulation research method or a combination of both. However,these studies are mainly concentrated in the simple-supported beam, few on continuous beam.Continuous beam is widely used in structural engineering as a form of structure, to study itsmechanical properties after steel corrosion has a larger value in engineering applications.In this paper, finite element models of two-span corroded reinforced concrete continuousbeam with corrosion longitudinal steel in both tension and compression area are establishedby utilizing finite element software ANSYS. Then, the flexural properties of continuous beamof uniform and non-uniform corrosion are studied from following aspects as bearing capacity,deformation, longitudinal reinforcement stress, concrete stress and slip between reinforcementand concrete under the action of uniform loads, and compared with continuous beams not rust,conclusions are draw as following:1) The flexural bearing capacity of corroded reinforced concrete continuous beam drops,and decreased with the increase of longitudinal reinforcement corrosion rate increases,corrosion effect on ultimate bearing capacity of components is more significant.2) For the continuous beam of uniform corrosion, along with the increase of thelongitudinal reinforcement corrosion rate under the same load continuous beam deformationgradually increase. When the corrosion rate is more than10%, the deformation growthaccelerates. Non-uniform corrosion continuous beam deformation, deformation trend areclose to uniform corrosion continuous beam of the corrosion rate of15%.3) The strength of corroded reinforcement corrosion after its strength did not change, butreinforced plastic performance is greatly influenced.4) Concrete compressive decreases with the increase of the longitudinal reinforcementcorrosion rate when the corroded continuous beam achieves yield state or limit state. Theconcrete compressive stress is less than the design value of the compressive strength whencorroded continuous beam is under limit state.5) It is found in the calculating process whether it is not rust or corrosion continuousbeam the upper longitudinal reinforcement yield before lower longitudinal reinforcement. At the same time, under the same corrosion rate, the maximum number of slip between the upperlongitudinal bar and concrete is greater than it between the lower longitudinal reinforcementand concrete. |
