Analytical model for the prediction of the tensile behaviour of corroded steel bars

Zeng, Chaoqun; Zhu, Julie; Xiong, Cheng; Li, Yanru; Li, Dawang; Walraven, J.C.

doi:10.1016/j.conbuildmat.2020.120290

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…As an example, in the literature a simple linear decaying model 16,19,21,29 was proposed for yield and ultimate strength degradation of corroded bars. Since such strengths parameters refer to the reduced cross-sectional area of the corroded bar, to avoid misunderstanding it is more appropriate to refer to yield load F y and ultimate load F u of the bar (rather than to yield strength and ultimate strength) 46 as follows, respectively:…”

Section: Corrosion-induced Degradation Of Materials Parameters In Rc ...mentioning

confidence: 99%

“…As an example, in the literature a simple linear decaying model 16,19,21,29 was proposed for yield and ultimate strength degradation of corroded bars. Since such strengths parameters refer to the reduced cross‐sectional area of the corroded bar, to avoid misunderstanding it is more appropriate to refer to yield load

F_{y}

and ultimate load

F_{u}

of the bar (rather than to yield strength and ultimate strength) 46 as follows, respectively:

\frac{F_{y}^{*}}{F_{y}} = 1 - β_{F_{y}} \times Δ m; \frac{F_{u}^{*}}{F_{u}} = 1 - β_{F_{u}} \times Δ m

Several empirical values of

β_{F_{y}}

were determined in the literature through statistical regression of available experimental results, ranging from 0.0050 up to 0.0198, 7 depending on the average corrosion degree

Δ m

, the nature of exposure (service‐chlorides, service‐carbonation, accelerated corrosion, etc. ), the typology of bar (smooth vs. ribbed) and its position with respect to concrete (embedded or bare) and the kind of corrosion attack.…”

Section: Corrosion‐induced Degradation Of Materials Parameters In Rc ...mentioning

confidence: 99%

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Seismic vulnerability assessment of reinforced concrete bridge piers with corroded bars

Domenico

Messina

Recupero

2023

Structural Concrete

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Reinforced concrete (RC) structures located in aggressive environment, for example, RC bridge piers close to the sea and experiencing chloride attacks, may be exposed to an increased seismic vulnerability. This requires practical yet effective safety assessment strategies aimed to determine the seismic behavior by incorporating corrosion deterioration phenomena. An easy‐to‐use phenomenological model is here developed to describe the seismic behavior of corroded RC elements based on a fiber hinge formulation wherein the corrosion‐induced mechanical degradation of concrete and steel is implemented through appropriate constitutive laws at the fiber level. The developed fiber hinge formulation is first validated against experimental cyclic tests of corroded RC columns from the literature. Then, the proposed approach is used for the seismic vulnerability assessment of the Zappulla multi‐span viaduct (southern Italy), whose RC bridge piers (with a box‐shaped, two‐cell hollow rectangular cross section) are exposed to carbonation and chloride‐induced corrosion. A comprehensive in‐situ testing campaign is conducted for the mechanical characterization of the materials in the RC piers. Corrosion potential mapping, carbonation tests and tensile tests on corroded bars extracted from RC piers are critically interpreted to calibrate the constitutive laws of the fiber‐hinge model. Motivated by experimental findings, numerical seismic analyses (including linear dynamic, nonlinear static and nonlinear dynamic analyses) are performed under two different corrosion scenarios to quantify the impact of corrosion on the resulting seismic vulnerability conditions of bridge piers with corroded bars. The proposed approach is characterized by low computational cost and lends itself to large‐scale seismic vulnerability assessment of other existing RC bridges placed in corrosive environment.

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Section: Corrosion-induced Degradation Of Materials Parameters In Rc ...mentioning

confidence: 99%

“…As an example, in the literature a simple linear decaying model 16,19,21,29 was proposed for yield and ultimate strength degradation of corroded bars. Since such strengths parameters refer to the reduced cross‐sectional area of the corroded bar, to avoid misunderstanding it is more appropriate to refer to yield load

F_{y}

and ultimate load

F_{u}

of the bar (rather than to yield strength and ultimate strength) 46 as follows, respectively:

\frac{F_{y}^{*}}{F_{y}} = 1 - β_{F_{y}} \times Δ m; \frac{F_{u}^{*}}{F_{u}} = 1 - β_{F_{u}} \times Δ m

Several empirical values of

β_{F_{y}}

were determined in the literature through statistical regression of available experimental results, ranging from 0.0050 up to 0.0198, 7 depending on the average corrosion degree

Δ m

Section: Corrosion‐induced Degradation Of Materials Parameters In Rc ...mentioning

confidence: 99%

Seismic vulnerability assessment of reinforced concrete bridge piers with corroded bars

Domenico

Messina

Recupero

2023

Structural Concrete

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“…Figure 3 shows a schematic representation of a reinforcing bar, suffering pitting corrosion (Zeng et al 3 ) in combination with the stress-strain relation of an undamaged bar (Figure 3b). For determining the effect of corrosion on the strength characteristics and ductility of the reinforcing steel, the loss of mass of a steel bar due to corrosion can be used.…”

Section: Structures With Corroded Reinforcement: Change Of Properties...mentioning

confidence: 99%

Approach to assessment of existing structures in the fib Model Code 2020

Walraven

Dieteren

2023

Structural Concrete

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Existing structures often no longer meet the demands formulated in contemporary design codes with respect to structural safety and serviceability. This occurs, for instance, if the loads on existing structures, like traffic loads on bridges, are larger than assumed in the original design. A second potential reason is that structures are subject to deterioration, like alkali–silica reaction within the concrete or corrosion of the reinforcement due to chloride attack or carbonation. A third possible reason is that in recent codes, additional criteria have been introduced based on new theories and/or negative experiences with older structures. The new fib Model Code for Concrete Structures 2020 will be valid both for the design of new structures and the assessment of existing structures. This paper shows how the design and assessment of concrete structures are integrated into this new code concept.

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“…e cross section reduction method was adopted for the simulation of the reinforcement corrosion [38][39][40][41].…”

Section: Numerical Simulation Of Shear Capacity Of Corrodedmentioning

confidence: 99%

Experimental and Numerical Study on Ultimate Shear Load Carrying Capacity of Corroded RC Beams

Tang

Chen

et al. 2021

Advances in Civil Engineering

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For an RC beam, the strength of steel rebar, the bonding strength between the concrete and reinforcement, and the bite action between the aggregates will deteriorate significantly due to corrosion. In the present study, 10 RC beams were designed to study the impact of corrosion on the shear bearing capacity. The mechanism of corrosion for stirrups and longitudinal bars and their effects were analyzed. Based on the existing experimental data, the correlation between the stirrup corrosion factor and the cross section loss rate was obtained. An effective prediction formula on the shear bearing capacity of the corroded RC beams was proposed and validated by the experimental results. Moreover, a numerical analysis approach based on the FE technique was proposed for the prediction of the shear strength. The results show that corrosion of the reinforcements could reduce the shear strength of the RC beams. The corrosion of stirrups can be numerically simulated by the reduction of the cross section. The formulae in the literature are conservative and the predictions are very dispersed, while the predictions by the proposed formula agree very well with the experiment results.

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Analytical model for the prediction of the tensile behaviour of corroded steel bars

Cited by 16 publications

References 29 publications

Seismic vulnerability assessment of reinforced concrete bridge piers with corroded bars

Seismic vulnerability assessment of reinforced concrete bridge piers with corroded bars

Approach to assessment of existing structures in the fib Model Code 2020

Experimental and Numerical Study on Ultimate Shear Load Carrying Capacity of Corroded RC Beams

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