Abstract
In relatively cold environments, the combination of freeze–thaw and steel bar corrosion is a key factor affecting the durability of concrete. The adjustment of the stirrup ratio would change the mechanical performance of surrounding concrete, while the circumferential compressive stress can further improve the bonding performance. Hence, based on eccentrically tensioned specimens, the influence of corrosion of stirrups and freeze–thaw of concrete on bond properties is discussed in this paper. The monotonic pull-out test of reinforced concrete specimens is carried out to study the variation rules of bond strength and slip between steel bar and concrete under the coupling action of corrosion rate, freeze–thaw times and stirrup spacing. Based on the experimental data, the empirical formula for the ultimate bond strength is obtained, and a bond–slip constitutive model is established considering the stirrup spacing, stirrup corrosion rate and freeze–thaw times. Then, a refined finite element pull-out specimen model is established by ABAQUS simulation, and the numerical simulation results are compared with the real test ones, so as to make up for the deficiencies in the test and lay the foundation for further finite element analysis.
Highlights
The degradation of reinforced concrete (RC) structures due to freeze–thaw cycles and reinforcement corrosion is a major problem that must be faced in infrastructure construction [1,2,3,4], causing the reduction of the service life of reinforced concrete structures and the increase in maintenance costs
Zhou et al [25] further investigated the effect of stirrup corrosion on the bond performance, and the results showed that the effect of stirrup corrosion on bond strength was less than main reinforcement corrosion
By comparing the intercept distance of specimens with different stirrup spacing and freeze–thaw times, it can be found that the increase in the number of freeze–thaw cycles significantly affects the bond strength and ultimate slip between the reinforcement and the concrete, which can be explained by that freeze–thaw cycles can cause micro-cracks to expand within the structure and intersect with the reinforcement
Summary
The degradation of reinforced concrete (RC) structures due to freeze–thaw cycles and reinforcement corrosion is a major problem that must be faced in infrastructure construction [1,2,3,4], causing the reduction of the service life of reinforced concrete structures and the increase in maintenance costs. On the basis of the existing bond–slip model, Wang et al [17] proposed a new bond–slip model considering the freeze–thaw damage effect on concrete and applied it to the fiber model These studies explore the effects of freeze–thaw cycles on bond–slip behavior and further promote the application of reinforced concrete in the engineering field. The bond–slip behavior of RC prism specimens under the coupling action of three factors (steel bar corrosion, freeze–thaw cycle and current corrosion used to corrode stirrups,constitutive and relationship the eccentric between tenstirrup ratio) was method studied.was. Specimens under the coupling action of three factors (steel bar corrosion, freeze–thaw the finite element analysis (FEA) was further performed, and the test results were cycle analyzed and stirrup ratio) was studied. Test Setup and Procedure analyzed and compared with the simulation data, verifying its rationality and applicability
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