Mechanical behaviour of corroded strands under chloride attack: A new constitutive law

Franceschini, Lorenzo; Vecchi, Francesca De; Tondolo, Francesco; Belletti, Beatrice

doi:10.1016/j.conbuildmat.2021.125872

Cited by 24 publications

(26 citation statements)

References 19 publications

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“…This phenomenon can be studied with models of the response up to failure, as shown for instance by Castel et al 17 analyzing laboratory tests on corroded post‐tensioned beams, using both analytical and numerical NLFE analyses. Such analyses can include constitutive models of the strands reinforcement stress–strain response, with reductions of the ultimate strength and strain (Yeon et al 12 ). The models used here assumed that due to the limited ultimate strain the corroded strands were already broken before the failure was reached, not contributing to the resistance at the ultimate stage.…”

Section: Discussionmentioning

confidence: 99%

“…Tests on corroded strands measure tensile failure at strains lower than the sound reinforcement. 2,12 Modeling carried out on corroded prestressed beams ( 6 ) shows that corroded strand failures occur earlier during the response to failure than the sound reinforcement, and can be eliminated from the calculation of the capacity. This last statement assumes that the numerosity of strands is high, as is common in many bridge structures for instance, and only part are corroded; in this study the most deteriorated beams had $20%-25% of the reinforcement affected.…”

Section: Flexural Resistance Modelmentioning

confidence: 99%

“…Tests on corroded strands measure tensile failure at strains lower than the sound reinforcement 2,12 . Modeling carried out on corroded prestressed beams ( 6 ) shows that corroded strand failures occur earlier during the response to failure than the sound reinforcement, and can be eliminated from the calculation of the capacity.…”

Section: Modelmentioning

confidence: 99%

See 2 more Smart Citations

Structural assessment of prestressed beams with natural corrosion

Coronelli

Mircea

Rogers³

et al. 2022

Structural Concrete

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An experimental campaign carried out on prestressed bridge beams corroded in a marine environment is analyzed in order to understand the failure modes related to the deterioration phenomena and setup models for capacity assessment. Three main failures modes were identified: shear in the web, shear failure in corroded zones with prestress loss and flexural failure for corroded strands in tension; this last mode becomes dominant for increasing corrosion. A truss model was used for flexure and shear resistance, considering the presence of both bottom pretensioned strands breaks and a draped post‐tensioned tendon cuts. The development of new anchorage at the sides of the damaged zones of the strands was modeled. Corrosion effects are modeled reducing the reinforcement cross‐section and bond, and modifying the prestressing distribution and the truss angle for shear. The accuracy of the model predictions relies on the corroded cross section loss input. In the light of the comparison of test and models results a methodology setup in the literature is here extended with scenarios considering higher levels of corrosion damage.

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Section: Discussionmentioning

confidence: 99%

Section: Flexural Resistance Modelmentioning

confidence: 99%

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Structural assessment of prestressed beams with natural corrosion

Coronelli

Mircea

Rogers³

et al. 2022

Structural Concrete

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“…In this context, several works have been carried out to investigate the stress-strain relationship of corroded steel rebars, [5][6][7][8][9][10][11][12][13][14][15][16] whereas limited studies have been performed for the prediction of the residual mechanical response of corroded prestressing strands. [17][18][19][20][21][22] In Table 1, the main features of each model are summarized. In detail, the several decay laws proposed by different authors are generally based on one of these parameters: (i) the mass loss, η, of the corroded sample, generally evaluated by adopting the procedure described in the ASTM G1-03 Standard, 23 or (ii) the crosssectional loss, μ, of the corroded prestressing strand.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, referring to chloride-induced corrosion, different pit-type morphology configurations were proposed for the evaluation of the cross-sectional loss due to pitting. Val et al 26 introduced a hemispherical pit-type morphology configuration, Hartt and Lee 27 proposed a planar configuration, whereas Jeon et al 18 and Franceschini et al 17 considered three different pit-type morphology configurations to properly describe the variability in shape of pitting corrosion. However, considering the complexity of expressions and the number of parameters involved in the prediction of the residual mechanical response of corroded prestressing strands, the applicability of the constitutive laws reported in Table 1 results hardly applicable in the daily engineering practice.…”

Section: Introductionmentioning

confidence: 99%

A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The SCPS‐model

Franceschini

Belletti

Tondolo

2022

Structural Concrete

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This article presents a simplified stress-strain relationship for the definition of the mechanical behavior of prestressing strands subjected to chloride-induced corrosion, named SCPS-model (Simplified Model for Corroded Prestressing Strands).The constitutive law adopts the equivalent spring model, that reproduces the overall behavior of a corroded strand by summing the contributions of each wire, assumed as a spring working in parallel to the others. The SCPS-model is designed for the application in the daily engineering practice; to this aim, it is based on a single input parameter that is the maximum penetration depth of the most corroded wire. Following a detailed description of the model formulation and parameters, the article shows the validation of the stress-strain relationship through several comparisons with experimental tensile test outcomes coming from scientific literature. Finally, a statistical analysis of the dimensionless ratio of experimental and analytical results in terms of ultimate corroded strength and strain is carried out to demonstrate the effectiveness of the SCPS-model. Concluding, the accurate and safe side prediction of the residual mechanical behavior of corroded prestressing strands is proposed using the SCPS-model.

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Strength reduction curves for corroded seven‐wire strands

Marra,

Palermo,

Trombetti

et al. 2023

ce papers

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Steel seven‐wire strands are highly vulnerable to corrosion phenomena, which can strongly reduce their strength and ductility capacities. Following several parametric studies already conducted on corroded wires and strands, which allowed to identify the key parameters that govern their mechanical behavior, this paper presents a new resistance model for corroded seven‐wire strands. The model introduces a new coefficient that takes into account the variability of the corrosion in the seven wires that constitute the strand, with the purpose of representing the dispersion in the peak strength often emerged from tensile tests available in the literature. The lower bound of this coefficient is estimated analytically considering a brittle behavior for the wires. The ductile behavior is then taken into account by means of several Monte‐Carlo simulations of corroded strands. Finally, the resistance model allows to define strength reduction curves that allow to estimate the strength of corroded strands taking into account both the geometry of the corrosion and the steel material parameters. They represent simple engineering tools that are of great interest from both a design and safety assessment point of view.

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Mechanical behaviour of corroded strands under chloride attack: A new constitutive law

Cited by 24 publications

References 19 publications

Structural assessment of prestressed beams with natural corrosion

Structural assessment of prestressed beams with natural corrosion

A simplified stress–strain relationship for the mechanical behavior of corroded prestressing strands: The SCPS‐model

Strength reduction curves for corroded seven‐wire strands

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