Transfer length of corroded wires in prestressed concrete members

Anaya, Pablo; Martı́n-Pérez, B.; Rodrı́guez, J.; Andrade, Carmen

doi:10.1002/suco.202100265

Cited by 7 publications

(10 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As can be seen in Fig. (15), the greatest increase in transfer length occurred at 14 to 28 days after release with an increase of 12.4%. 16) shows concrete strain profile in terms of specimen length for beam PS10-E2-4 at specific times after strand release.…”

Section: Transfer Length Variations In Beams Ps4-c1-240 and Ps4-c2-4mentioning

confidence: 64%

Experimental Investigation on the Effect of Time on Transfer Length in Pre-Stressed Concrete Beams

Naghipour,

Daronkolae,

Yousefpour

et al. 2024

Preprint

View full text Add to dashboard Cite

The effect of time on of transfer length variations in prestressed concrete elements has not been addressed in the current design codes of practice. The present investigation examines the effect of different parameters on transfer length over time. Therefore, a number of 13 pretensioned concrete beams were made in the laboratory with differences in beam cross-section and length, strand number and arrangement, concrete cover, and strand eccentricity. The 95% AMS technique was used to calculate transfer length. The results showed that transfer length of all beams increases over time, the highest measure was experienced between 14 and 28 days after strand detensioning. This value ranged between 2 and 5% in single-strand beams, and 12 to 14% in 10-strand beams. It was concluded that strand eccentricity has no considerable effect on the transfer length variations. The beam live end captured higher transfer lengths in most of the beams; however, strand arrangement and the amount of concrete cover were found to have the potential to shift higher transfer lengths to beam dead end. It was also revealed that beam length plays a significant role on transfer length, while longer beams featured larger transfer lengths. The percentage of increase in the transfer length in 10-strand beams after 14 days reached approximately twice that of the single-strand counterparts. The reason was associated with the number of strands, cross-sectional dimensions, and strand arrangement.

show abstract

Section: Transfer Length Variations In Beams Ps4-c1-240 and Ps4-c2-4mentioning

confidence: 64%

Experimental Investigation on the Effect of Time on Transfer Length in Pre-Stressed Concrete Beams

Naghipour,

Daronkolae,

Yousefpour

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…The reduction in the overall beam height is considered only for the very heavily corroded beams

η_{w, sn} > 75 %

from reference 6 (being

η_{w, sn}

the web reinforcement section loss ratio, see Notations for a detailed definition). Despite the reasonably satisfactory results obtained by comparing the shear strength predictions by the CCCM extension for corroded beams with the empirical results for the slender beams included in the database, future developments (outside the scope of this article) should include consideration of bond deterioration, 30,31 reduction of concrete compressive strength at cracked concrete and change in the mechanical properties of the deteriorated bars 32,33 …”

Section: The Compression Chord Capacity Model For Slender Rc Beams An...mentioning

confidence: 98%

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Frontera

Cladera

2022

Structural Concrete

View full text Add to dashboard Cite

Corrosion of stirrups (generally with small diameters and concrete covers) significantly affects the shear strength of reinforced concrete elements. As shear failures may lead to brittle collapses, hence the need to avoid them during structures' entire service life. The Compression Chord Capacity Model (CCCM), a shear mechanical model, was recently extended to predict the strength of corrosion-damaged beams by identifying the model parameters that could be most affected by steel corrosion. In this paper, the CCCM is combined with two material deterioration models included in the new Spanish Structural Code, and considers carbonation of concrete or chloride ions, to predict long-term shear strength evolution. Finally, a parametric analysis is carried out to explore the effect of the most influential parameters on shear strength degradation according to the used models and depending on different exposure classes.

show abstract

“…• In a first stage, studies were conducted on adhesion between concrete and steel reinforcements, a fundamental aspect for the optimum performance of reinforced concrete. 33,34 The use of RA was found to reduce adhesion, 35 although better RA quality to some extent countered that negative effect. 36 Moreover, the addition of fibers was found to improve RA-concrete bonding in one study.…”

Section: Introductionmentioning

confidence: 99%

“…Structural verification is a fundamental step to ensure that an alternative concrete composition can be used in structural components for building and civil‐engineering projects 29 . Hence the abundant literature on the structural verification of concretes containing sustainable raw materials, 30,31 including RA 32 : In a first stage, studies were conducted on adhesion between concrete and steel reinforcements, a fundamental aspect for the optimum performance of reinforced concrete 33,34 . The use of RA was found to reduce adhesion, 35 although better RA quality to some extent countered that negative effect 36 .…”

Section: Introductionmentioning

confidence: 99%

Scaled concrete beams containing maximum levels of coarse recycled aggregate: Structural verifications for precast‐concrete building applications

Fiol

Revilla‐Cuesta

Skaf

et al. 2023

Structural Concrete

View full text Add to dashboard Cite

The use of Recycled aggregate (RA) enhances concrete sustainability. If used on an industrial‐scale, structural verification, and testing will be required to confirm that RA concrete can meet relevant industrial standards and the requirements of manufacturers, especially in the precast‐concrete industry. In this paper, an experimental campaign with the participation of a precast‐concrete manufacturer is reported. The objective is to test a self‐compacting concrete (SCC) mix, designed for structural applications, that contains maximum amounts of 100% coarse RA, in order to establish its compliance with the habitual requirements of precast‐concrete manufacturers. Thus, scaled beams (12 × 24 × 180 and 24 × 24 × 130 cm) were subjected to bending, shear‐bending, shear, and long‐term‐deflection tests. In addition, the performance of that SCC mix in the bending and shear‐bending tests was compared with the performance of an SCC mix of similar compressive strength containing 0% coarse RA. In the failure tests, the experimental results were between 1.5 and 3 times higher than the required values. The elastic behavior of both SCC mixes was also very similar in those tests, regardless of the amount of coarse RA, due to the robust design of the water and superplasticizer content of the SCC, which balanced the decreased flowability and the lower compressive strength of SCC that resulted from the additions of coarse RA. The SCC mix with 100% RA showed a lower load‐bearing capacity after failure and narrow compliance margins with the deflection limits of the long‐term‐deflection test. Even though the SCC mix with 100% RA met all the standard technical specifications of the precast‐concrete manufacturer, reference should always be made to the serviceability limit states that are applicable at the time of the structural design phase.

show abstract

Transfer length of corroded wires in prestressed concrete members

Cited by 7 publications

References 23 publications

Experimental Investigation on the Effect of Time on Transfer Length in Pre-Stressed Concrete Beams

Experimental Investigation on the Effect of Time on Transfer Length in Pre-Stressed Concrete Beams

Long‐term shear strength of RC beams based on a mechanical model that considers reinforcing steel corrosion

Scaled concrete beams containing maximum levels of coarse recycled aggregate: Structural verifications for precast‐concrete building applications

Contact Info

Product

Resources

About