Nonlinear Features of the Bond-Slip Ascending Branch

Leibovich, Orit; Yankelevsky, David Z.

doi:10.1061/(asce)mt.1943-5533.0003368

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…In all specimens but those with the 1500‐mm diameter, the shear zone width was determined based on special “window specimens” where DIC analysis provided information on the strain fields near the rebar ribs 8 . As no “window” was applied in the 150 mm diameter specimens, the good agreement shown in Figure 13(c) demonstrates the procedure generality 12 …”

Section: Simulation Of Experimental Resultsmentioning

confidence: 97%

“…Assuming a circular rib geometry, full axial symmetry is maintained, and the longitudinal location of each rib is clearly determined. In a recent investigation with a new experimental technique using a Digital Image Correlation (DIC) system, the strain field in the concrete around the ribs could be followed 10–12 and inclined local compressive strains of high intensity were identified at the ribs sides. This observation supports the assumption of inclined compressive forces concentrated at the ribs sides 6 and leads to an idealized representation of a radial pressure band of narrow width acting at the side of each rib, representing the radial component of the inclined compressive force.…”

Section: Variation Of the Circumferential Strains In The Longitudinal Directionmentioning

confidence: 99%

“…SZ(n) is the shear zone width vector in which the n th term corresponds to the n th slip term s n in the vector S(n). This expression is valid for different normal concrete strengths and confinement levels that have been tested, 7–12 where the rebar diameter was 20 mm. Based on this empirical data, the n th term of the SZ(n) vector is:

italicSZ ((), n) = 0.5 * italicSZ s_{n} * {(\frac{\emptyset_{cylinder}}{\emptyset_{rebar}})}^{0.3} * ((), \frac{\emptyset_{rebar}}{20}) * {(\frac{3.9}{ft})}^{0.25} * ((), \frac{italicfc}{43})

…”

Section: Variation Of the Circumferential Strain In A Thick‐walled Hollow Cylinder Subjected To An Interior Pressure Bandmentioning

confidence: 99%

“…The above expressions are implemented in a computational procedure to calculate the circumferential strain in the outer diameter of a specimen. It is valid for the ascending branch of the bond‐slip and the strain‐slip relationships, that are similar for Form‐A and Form‐B curves 12 . A key parameter in this procedure is the magnitude of the uniform radial pressure (p i ) acting on a pressure band at the shear zone boundary.…”

Section: Variation Of the Circumferential Strain In A Thick‐walled Hollow Cylinder Subjected To An Interior Pressure Bandmentioning

confidence: 99%

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Predicting the circumferential strains on a cylindrical concrete specimen during a pull‐out test

Leibovich

Yankelevsky

Dancygier

2021

Structural Concrete

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In a recent experimental research, the authors measured the circumferential strains on the cylindrical envelope of concrete specimens during pull‐out tests. This paper presents a theoretical approach, complementing the previous experimental study, aiming at predicting these measured circumferential strains and developing the understanding of the three‐dimensional behavior of the concrete cylinder. The proposed approach accounts for the specimen materials and geometrical parameters including the ribs and strain gauges locations and proposes an expression for the normalized and absolute circumferential strains along the specimen circumference due to ribs actions. This paper presents a new three‐dimensional model of the specimen behvior during a pull‐out test, which provides new insight on bond mechanics and illuminates the role of the radial pressures developed as part of the bond action. Several simulations were performed on specimens with three different diameters, two concrete strengths, and a different number of bonded ribs. All the simulations show very good agreement with the measured strain data. This study enhances the understanding of bond resistance during a pull‐out process and contributes to the understanding of the ring action that is developed in a concrete cylinder during a pull‐out test.

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Section: Simulation Of Experimental Resultsmentioning

confidence: 97%

Section: Variation Of the Circumferential Strains In The Longitudinal Directionmentioning

confidence: 99%

italicSZ ((), n) = 0.5 * italicSZ s_{n} * {(\frac{\emptyset_{cylinder}}{\emptyset_{rebar}})}^{0.3} * ((), \frac{\emptyset_{rebar}}{20}) * {(\frac{3.9}{ft})}^{0.25} * ((), \frac{italicfc}{43})

…”

Section: Variation Of the Circumferential Strain In A Thick‐walled Hollow Cylinder Subjected To An Interior Pressure Bandmentioning

confidence: 99%

Section: Variation Of the Circumferential Strain In A Thick‐walled Hollow Cylinder Subjected To An Interior Pressure Bandmentioning

confidence: 99%

See 2 more Smart Citations

Predicting the circumferential strains on a cylindrical concrete specimen during a pull‐out test

Leibovich

Yankelevsky

Dancygier

2021

Structural Concrete

Self Cite

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“…The bond stress-slip relationship of a bar embedded in the 3D printed concrete plays an important role in its properties, especially for its safety and reliability. At present, the research on the bond-slip between ordinary concrete and steel bars was relatively mature [2,38,25,3]. However, there were few studies on the bondslip properties of 3D printed concrete and steel bars.…”

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confidence: 99%

A novel bond stress-slip model for 3-D printed concretes

Liu

et al. 2022

DCDS-S

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<p style='text-indent:20px;'>This paper considers the 3D printing process as a discontinuous control system and gives a simple and coherent bond stress-slip model for a new and intelligent building 3-D printed concrete. The previous models focused on either the maximal stress or the maximal slip, however, the novel model uses an energy approach by the dimension analysis, so that the main factors affecting the bond stress-slip relationship can be clearly revealed, mainly including the concrete's properties (its porous structure and its strength), the steel bar's properties (its printing direction, its strength, its surface roughness and its geometrical property) and the printing process. It is confirmed that the proposed model, similar to the constitutive relationship in elasticity, plays a key role in concrete mechanics, and it can conveniently explain the observed phenomena from the experiment.</p>

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