Assessment of Mechanical Properties of Corroded Prestressing Strands

Jeon, Chi-Ho; Nguyen, Cuu Khoa; Shim, Chang-Su

doi:10.20944/preprints202005.0324.v1

Cited by 11 publications

(1 citation statement)

References 11 publications

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“…During the last 20 years, the deterioration of reinforced concrete (RC) and prestressed concrete (PC) structures induced by the corrosion process has seen increasing interest among researchers all over the world. Furthermore, the recent collapses of relevant infrastructures, such as the Italian bridges of Fossano (2017), Polcevera (2018), and Morandi (2018), 1 or the high structural damages observed for example, in the American bridges of the Niles Channel Bridge, Bob Graham Sunshine Skyway Bridge, and Varina‐Enon Bridge, 2 have highlighted even more the urgency to determine reliable approaches able to provide useful tools for the engineering assessment of the residual capacity of corroded structural elements.…”

Section: Introductionmentioning

confidence: 99%

Analytical method for the evaluation of the residual service life of prestressed concrete beams subjected to corrosion deterioration

Franceschini

Vecchi

Belletti

et al. 2021

Structural Concrete

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Since catastrophic failures caused by corrosion deterioration have been observed worldwide, nowadays a key research topic consists in the reliable prediction of the long‐term performance of corroded reinforced concrete structures. In this article, firstly, a refined model for the assessment of the residual service life of prestressed concrete (PC) beams has been presented. The analytical model, according to the most recent formulations proposed in the scientific literature, allows to take into account the effects induced by corrosion over time in the calculation of bending, shear, and anchorage resistances. Secondly, a case study concerning a PC beam without transversal reinforcement, exposed to wet‐dry cycles using seawater, has been presented considering the spatial variability of corrosion. To this aim, a constant and a varying spatial distribution of corrosion have been assumed. Finally, the residual service life values, evaluated according to the two assumed spatial distributions of corrosion in strands, have been compared. The proposed model can be used for the prediction of the possible failure modes of PC beams over time, considering both the reduction of the mechanical properties of the prestressing steel and the bond degradation due to corrosion deterioration according to recent experimental evidence.

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Section: Introductionmentioning

confidence: 99%

Analytical method for the evaluation of the residual service life of prestressed concrete beams subjected to corrosion deterioration

Franceschini

Vecchi

Belletti

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

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Theoretical Study on Prestress Loss in Cross-Tensioned Concrete Pavement with BFRP Tendons

Zhang

Huang

2020

Applied Sciences

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Cross-tensioned concrete pavement can reduce transverse joints and cracks and improve the durability of the pavement, and the decrease in slab thickness can be achieved without damaging the performance of the pavement. However, the corrosion of the steel can cause serious damage to the pavement structure, resulting in higher maintenance costs and shorter service life. Basalt fiber-reinforced polymer (BFRP) has been proven to be an effective alternative in both jointed plain concrete pavement (JPCP) and continuously reinforced concrete pavement (CRCP) due to its lightweight and corrosion-resistant properties. In this paper, a systematic theoretical method for determining the prestress loss of BFRP tendons in cross-tensioned concrete pavement was proposed, with the impact of the slab width and distribution angle of the prestressed tendon on the prestress loss being studied and compared to the results of traditional steel strands. Results showed that the proportion of the prestress loss due to anchorage deformation and prestress retraction in the prestressing stage rose with the increase in distribution angle and the decrease in slab width, while the prestress loss during the in-service stage was a constant value for both BFRP tendons and steel strands. The prestress loss of BFRP tendons was far lower than that of steel strands in both prestressing stage and in-service stage for a given slab width (3 m, 4.5 m, 9.0 m, 12.75 m) and distribution angle (20°, 25°, 30°, 35°, 40°, 45°), and the difference ranged from 6.4% to 16%, signifying the feasibility of BFRP tendons in cross-tensioned concrete pavement. Overall, the smaller the slab width, the greater the difference of the prestress loss between BFRP tendons and steel strands.

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Flexural Behavior of Post-Tensioned Concrete Beams with Multiple Internal Corroded Strands

Jeon

Shim

2020

Applied Sciences

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The corrosion of prestressing steel in prestressed concrete bridges is a critical safety issue. To evaluate the strength of a prestressed concrete beam with corroded strands, it is necessary to know the mechanical properties of the corroded strands in terms of their tensile strength and ductility. In this study, material models were suggested using tensile tests of corroded strands which had been taken from existing bridges. Five prestressed concrete beams with multiple internal corroded strands of different corrosion levels and locations were fabricated and tested using the three-point bending test. The beams with corroded strands near the support did not show meaningful flexural behavior changes, while the beams with corrosion in the mid-span showed significant strength reduction. In order to suggest the appropriate evaluation of the flexural strength of a prestressed concrete beam with corroded strands, material models of the corroded strands were divided into two model categories: a bi-linear material model and a brittle material model. Strength evaluations of the corroded prestressed concrete beams according to fps approximation and strain-compatibility using OpenSEES were conducted. Results suggested the use of the strain compatibility method only when the section loss was greater than 5%.

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Assessment of Mechanical Properties of Corroded Prestressing Strands

Cited by 11 publications

References 11 publications

Analytical method for the evaluation of the residual service life of prestressed concrete beams subjected to corrosion deterioration

Analytical method for the evaluation of the residual service life of prestressed concrete beams subjected to corrosion deterioration

Theoretical Study on Prestress Loss in Cross-Tensioned Concrete Pavement with BFRP Tendons

Flexural Behavior of Post-Tensioned Concrete Beams with Multiple Internal Corroded Strands

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