An interlocking approach for the rebar-to-concrete contact in bond

Tirassa, Max; Ruiz, Miguel Fernández; Muttoni, Aurelio

doi:10.1680/jmacr.20.00209

Cited by 12 publications

(8 citation statements)

References 10 publications

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“…This suggests that the concrete and steel have successfully interlocked to form a mechanical bond along the deformed surfaces, but not the smooth surface. These results are consistent with experiments done by researchers such as Tirassa et al [38], who demonstrated the importance of steel-concrete interlock for bond strength in conventional rebar, especially after concrete cracking. Figure 7a shows that this bond is intact on parts of the circumference of the ribbed rebar.…”

Section: Bond Failuresupporting

confidence: 93%

Experimental investigation of ribbing pattern effect on the bonding qualities of water jet cut steel reinforcement

Higuchi

Jewett

Carstensen

2022

Archit. Struct. Constr.

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With the rise of interest in digital fabrication of reinforced concrete structures, a great number of structural concrete designs that depart from standard prismatic shapes are being suggested. This has prompted an exploration of steel reinforcement strategies that are alternative to the classical deformed or “ribbed” rebars. One such is to cut internal reinforcement from steel plates using a waterjet cutting machine. Advantages of automated waterjet cutting steel reinforcement include high precision and accuracy, and minimal expense for increasing the complexity of (2D) reinforcement layouts. However, it is not known how the application of ribbing patterns along the cut edge of reinforcing bars affects the steel–concrete bond. This work conducts experimental pullout tests of waterjet-cut steel plate reinforcement with three different ribbing patterns and compares the bond strength with equivalent classic rebars. Two of the tested geometries averaged within 90–91% of the pull-out force of conventional rebar, demonstrating viability of this alternative reinforcement method.

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Section: Bond Failuresupporting

confidence: 93%

Experimental investigation of ribbing pattern effect on the bonding qualities of water jet cut steel reinforcement

Higuchi

Jewett

Carstensen

2022

Archit. Struct. Constr.

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“…43,63,64 This would require the cohesive elements to be smaller than the characteristic length and would justify an usage of our hybrid approach. The presented method would also allow to study the propagation of cracks along surfaces with interlocking protuberances such as aggregates and re-bars in concrete 60,65,66 or for bioinspired sutures. 67,68 These are forming an active field of research, since interlocking mechanisms introduce a resistance to crack propagation which can increase the effective material strength.…”

Section: Discussionmentioning

confidence: 99%

Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

Pundir

Anciaux

2021

Numerical Meth Engineering

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In materials, the evolution of crack surfaces is intimately linked with the self-contact occurring between them. The developed contact forces not only mitigate the effect of stress concentration at crack tip but also contribute significantly to the transfer of shear and normal stresses. In this article, we present a numerical framework to study the simultaneous process of fracture and self-contact between fracturing surfaces. The widely used approach, where contact constraints are enforced with the cohesive element traction separation law, is demonstrated to fail for relative displacements greater than the characteristic mesh length. A hybrid approach is proposed, which couples a node-to-segment contact algorithm with extrinsic cohesive elements. Thus, the fracture process is modeled with cohesive elements, whereas the contact and the friction constraints are enforced through a penalty-based method. This hybrid cohesive-contact approach is shown to alleviate any mesh topology limitations, making it a reliable and physically based numerical model for studying crack propagation along rough surfaces.

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“…10 These tests indicate, however, that the aggregate interlock stresses approach zero for a more severe crack development, which is also reflected by the proposed expressions. Additionally, Appendix Figure shows the proposed Equation ( 11) and ( 12) compared to the Mixed-Mode tests by Tirassa et al [35][36][37] Here, the maximum aggregate size d g is varied from 8 to 16 mm, the concrete compressive strength f c is varied from 29.1 to 48.1 MPa, the initial crack opening w 0 is varied from 0.015 to 0.1 mm and the crack dilatancy angle γ is varied from 40 to 60 . Note, that only the tests with primary cracking (PC) is included since secondary cracks induced by aggregate interlock stresses is typically not observed to emerge from shear cracks.…”

Section: Modified Aggregate Interlock Modelmentioning

confidence: 99%

The influence of small amounts of shear reinforcement on the shear‐transferring mechanisms in RC beams: An analysis based on refined experimental measurements

Autrup

Jørgensen

Hoang

2022

Structural Concrete

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Small amounts of shear reinforcement are often assumed to increase the shear capacity of RC beams, compared to an identical beam without shear reinforcement. However, in a recent experimental campaign, the shear capacity of beams with a shear reinforcement ratio below the minimum requirements according to the design standards turned out to be similar to identical beams without shear reinforcement. This paper presents a detailed analysis of why the shear capacity may be similar for beams without-and beams with small amounts of shear reinforcement. This includes the influence of small amounts of shear reinforcement on the shear behaviour and shear-transferring mechanisms. The analysis shows that the crack development is more severe at the ultimate load for beams with a small amount of shear reinforcement compared to beams without shear reinforcement. This more severe crack development is shown to cause an overestimation of the shear contribution from aggregate interlock when applying a well-known constitutive model often used for beams without shear reinforcement. Therefore, a new expression for the aggregate interlock stresses is proposed. A comparison of the proposed expression with Mixed-Mode crack opening tests shows a good agreement with the test for both small and large crack openings. By applying the proposed expression on the measured crack kinematics it is shown that for a large shear contribution from aggregate interlock the shear contribution from the shear reinforcement is very limited and as the aggregate interlock stresses decrease the shear contribution from the shear reinforcement increases. This shift in the governing shear-transferring mechanism can help to improve the requirements for the minimum shear reinforcement often found in the design standards.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, if any, approximately nine months after the print publication.

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An interlocking approach for the rebar-to-concrete contact in bond

Cited by 12 publications

References 10 publications

Experimental investigation of ribbing pattern effect on the bonding qualities of water jet cut steel reinforcement

Experimental investigation of ribbing pattern effect on the bonding qualities of water jet cut steel reinforcement

Coupling between cohesive element method and node‐to‐segment contact algorithm: Implementation and application

The influence of small amounts of shear reinforcement on the shear‐transferring mechanisms in RC beams: An analysis based on refined experimental measurements

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