Modeling the effect of corrosion on bond strength at the steel–concrete interface with finite-element analysis

Abstract

This paper examines the basic influence of corrosion on bond strength at the steel–concrete interface and the associated slip and cracking. A nonlinear finite-element model is developed to account for the effect of corrosion on deterioration of the bond. Deterioration of the mechanical interaction between the corroding reinforcing steel and the concrete is modeled with the nonlinear finite-element program ABAQUS. The contact pressure normal to the steel–concrete interface is reduced when the concrete cracks, which occurs along with a decrease in the cross-sectional area of the steel bar and the decrease of the friction coefficient between the steel and the concrete. The loss of contact pressure and the decrease in the friction coefficient with the mass loss of steel bars are evaluated using pullout test specimens with different levels of rebar corrosion. Finally, the relationship between the loss of bond strength and the mass loss of the steel rebar is established. The model gives reasonably accurate predictions of bond strength for three independent experimental studies. Key words: bond, concrete, corrosion, mechanical interaction, reinforcing steels, slip, steel-concrete interface.

Three-dimensional Nonlinear Bond Model incorporating Transverse Action in Corroded RC Members

“…Similar experimental results have been reported by Amleh et al (2006), as shown in Table 2. Most correspond to cases of severe corrosion (greater than 10% of the corrosion loss) and wide splitting cracks (greater than 3mm).…”

“…This implies that the coupling effect of corrosion and shrinkage on bonding needs to be further investigated. These cases with significant shrinkage are excluded from Further analysis is carried out to simulate the experiments carried out by Amleh et al (2006). Table 4 shows the input parameters in these cases.…”

“…In the past decade, lots of effort (Coronelli 2002;Berra et al 2003;Lundgren 2005Lundgren , 2007Amleh et al 2006) has been made to investigate residual bonding action after corrosion. The focus has been on the corrosion-induced pressure at the concrete-bar interface and this has been found to be greatly affected by the state of confinement; e.g., the presence of web reinforcement and/or a skin steel.…”

“…Different approaches to the study of corrosion pressure have been reported in the literature. Berra et al (2003) model the rib geometry by finite element analysis in which an inherent corrosion pressure is assumed, while Lundgren (2005Lundgren ( , 2007 and Amleh (2006) use friction models for the relationship between bond stress and interfacial pressure.…”

Corrosion propagation phase and bond strength degradation of reinforced concrete structures: State of the art

“…During the propagation phase of the corrosion, the following can be observed: reduction of the cross-sectional area, loss of original shapes and disappearance of the reinforcement steel ribs [9][10][11][12]. This may also cause both a weak interface layer and finally the disengagement of the ribs [9,13,14].…”