Abstract
Based on meso-damage mechanics and finite element analysis, the aim of this paper is to describe the feasibility of the Gurson–Tvergaard–Needleman (GTN) constitutive model in describing the tensile behavior of corroded reinforcing bars. The orthogonal test results showed that different fracture pattern and the related damage evolution process can be simulated by choosing different material parameters of GTN constitutive model. Compared with failure parameters, the two constitutive parameters are significant factors affecting the tensile strength. Both the nominal yield and ultimate tensile strength decrease markedly with the increase of constitutive parameters. Combining with the latest data and trial-and-error method, the suitable material parameters of GTN constitutive model were adopted to simulate the tensile behavior of corroded reinforcing bars in concrete under carbonation environment attack. The numerical predictions can not only agree very well with experimental measurements, but also simplify the finite element modeling process.
Highlights
Structure deterioration induced by corrosion of reinforcing bars is one of the major problems in civil engineering
Investigation of the deterioration of mechanical properties of corroded steel bars is crucial for predicting the serviceability and durability of reinforced concrete structures
In the range analysis of orthogonal test, K is the average of strength of every level and R scales the effect of variables on the Source Index S
Summary
Structure deterioration induced by corrosion of reinforcing bars is one of the major problems in civil engineering. Investigation of the deterioration of mechanical properties of corroded steel bars is crucial for predicting the serviceability and durability of reinforced concrete structures. The mathematical models of stress-strain relationship for corroded rebars in different environment condition have been established. These observed macroscopic experimental phenomena cannot reflect the relationship between the macroand meso-material characteristics, in which the former is related to the mechanical weakening of the material and the latter is associated with the large number of randomly distributed defects of irregular shapes, sizes and orientations
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