Analytical model for the bond-slip behaviour of corroded ribbed reinforcement

Abstract

Corrosion of reinforcement affects the bond mechanism between reinforcement and concrete, and thus the anchorage. Reliable models describing this are needed especially for assessment of the load-carrying capacity of existing structures. This paper presents an analytical one-dimensional model for bond-slip response of corroded reinforcement. The proposed model is an extension of the bond-slip model given in the CEB-FIP Model Code 1990, and is practically applicable for structural analyses to determine the loadcarrying capacity of corroded structures. Furthermore, the anchorage length needed to anchor the yield force is calculated from the bond slip, using the one-dimensional bondslip differential equation. Results of the proposed model are compared to experimental results as well as results from an advanced three-dimensional finite element model. The suggested model is shown to give results that are consistent with the physical behavior.

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

“…Analytical modelling and numerical modelling have been developed using bond stress-slip theories and finite element approaches [24][25][26][27]. Empirical modelling based on experimental investigations has been found to be more realistic and versatile for bond strength degradation.…”

Analysis of Mechanical Behavior of Corroded Reinforced Concrete Structures

“…The anchorage length needed to anchor the yield force was calculated from the bond-slip behavior, as described in the literature 30 ( Fig. 9).…”

“…This procedure can be applied to solid and structural analysis models where the bond-slip between the concrete and reinforcement is modeled by 1-D bond-slip interface elements, such as in the analyses presented in this paper. For simpler structural analysis models where the bond-slip is not directly incorporated in the model, it is proposed that the procedure described 30 can be applied to calculate anchorage length. Either the capacity of the reinforcement is then adjusted in the anchorage region or the anchorage is checked manually.…”

“…The bond properties of the analysis model should then be modified accordingly. The modification could be made using the method proposed in Lundgren et al 30 The method is based on research presented in the literature [11][12][13] and the 1-D bond-slip model of CEB-FIP Model Code 1990. 31 A brief description of the method is given in the following section.…”

Evaluation of bond stress-slip models for FRP reinforcing bars in concrete

“…An analytical expression for a monotonic bond stress-slip curve, which describes the bond stress between FRP rebars and concrete, was proposed based on experimental data by Malvar [18]. A bond-slip constitutive law known as the BPE Model, which was developed by Eligehausen et al [13] for deformed steel bars, has been the most well-known and commonly used model in analysis of traditional steel-reinforced concrete structures [19][20][21][22][23]. This model was applied to represent the local bond stress-slip relationship of FRP rebars by Rossetti et al [24] and Cosenza et al [14] through calibrating the parameters based on the experimental results.…”