Analysis of the relative rib area of reinforcing bars pull out tests

Barbosa, Maria Teresa; Filho, Emil de Souza Sánchez; Oliveira, Thaís Mayra de; Santos, White José dos

doi:10.1590/s1516-14392008000400013

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…On the other hand, when ribs are used, strength in the slipping is due, mainly, to the strength that the concrete offers to the pressures exercised on it by the ribs. This means that the chemical adhesion has a less importance in this case when compared to the mechanical interaction between the ribs and the surrounding matrix (Barbosa et al 2008).…”

Section: Introductionmentioning

confidence: 99%

A robust design of an innovative shaped rebar system using a novel uncertainty model

Aldoumani

Khodaparast

Giannetti

et al. 2018

Struct Multidisc Optim

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The current paper has investigated a newly developed re-bar system by implementing uncertainty models to optimise its geometry. The study of the design parameters of this re-bar system has been carried out utilising a novel uncertainty model that has been developed at Swansea University. The importance of this invention comes from the fact that the whole process of optimisation has been automated by linking ANSYS Workbench to MATLAB via the in-house written code, Despite the fact that in the past, ANSYS APDL was linked to MATLAB, however, the APDL was very limited to only simple geometries and boundary conditions unlike the Workbench which can simulate complex features. These shortfalls have been overcome by automating the process of optimisation, identifying the key influential parameters and the possibility to carry out a huge number of trials. Moreover, the tools that have been developed can pave the way for robust optimisation of this proposed structure. The uncertainty in the design parameters of this re-bar system is of a paramount importance in order to optimise the bond strength between the newly developed rebar and the concrete matrix as well as to fully understand the behaviour of the proposed system under pull-out conditions. The interface between the rebar and the concrete matrix was considered as a 'cohesive zone' whereby the interfacial area is studied as a function of the bonding strength.

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Section: Introductionmentioning

confidence: 99%

A robust design of an innovative shaped rebar system using a novel uncertainty model

Aldoumani

Khodaparast

Giannetti

et al. 2018

Struct Multidisc Optim

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“…The reason of these two different geometries is only due to manufacturing criteria, with no structural justification. Currently, several researches can be found about the influence of the shape of the ribs on the tensile and fatigue behaviour of the reinforcement Tempcore steel, in addition to the bonding strength concrete-steel (Lorrain et al 2010;Tao et al 2017;Barbosa et al 2008;Majumdar et al 2018;Hortigón et al 2019). These authors conclude that the ribs cause a reduction of the mechanical properties of steel but it is worth to note that no references to the improvement of their designs is found.…”

Section: Introductionmentioning

confidence: 99%

Parameterization of Stainless Steel Rebars to Improve Bonding Strength in Masonry Repairing

Hortigón

Ancio

Rodríguez-Mayorga

2021

Lecture Notes in Civil Engineering

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Transversally tying and bed joint structural repointing are well-known techniques when speaking about repairing and reinforcing masonry walls and columns. Both techniques are widespread applied since they have given excellent and durable results. The introduction of stainless steel rebars or, more recently, polymeric fibre strips, along the joints or transversally tying the external masonry leaves of structural elements improves the behaviour of the conjunct and its mechanical properties.The current shape of stainless steel rebars is the legacy of the rebars used to reinforce concrete. Many researches can be found about the influence of shape in bonding of carbon steel rebars and concrete. However, no research has been found about stainless steel rebars. The context of repairing masonry structures is significantly different of reinforced concrete mainly since so, consequently, a deeper study is compulsory to improve the design of these rebars when are used with this target.In this paper, the preliminary studies about modelling and numerical simulations are exposed. To accomplish these goals, the rebars have been geometrically parametrised and analysed by means of the Finite Element Method. This way, the influence of several geometrical parameters have been researched and the results compared.

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“…ACI 408 [5] provides a good overview of these parameters. Many of the studies [6][7][8][9][10] have discussed some of these parameters and their influence on the interaction of reinforcement and concrete of different types, in most cases normal weight concrete was used, but little information is available on bond behavior of LWFC.…”

Section: Introductionmentioning

confidence: 99%

“…ACI 408 [5] provides a good overview of these parameters. Many of the studies [6][7][8][9][10] have discussed some of these parameters …”

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confidence: 99%

Effect of Fibers on Bond Performance of Lightweight Reinforced Concrete

Ali

Iqbal

Holschemacher

et al. 2016

Period. Polytech. Civil Eng.

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IntroductionIn construction industry lightweight concrete and fiber reinforced concrete are being used for many years. The former is known for brittle nature, light in weight and low thermal conductivity properties. It also offers better workability when compared to the normal weight concrete for the same slump value [1] These properties are affected by addition of discrete fibers; the effect being variable with the type and volume fraction of fibers [2].Use of steel fibers in structural concrete is particularly encouraged in members of structural system where geometrical constraints restrict use of traditional reinforcement. Guecna and Serna [3] suggest fiber reinforced concrete as a possible solution to shear failure problem in hollow core slabs where use of stirrups is challenging. High performance fiber reinforced cementitious composites having hardening behavior perform better as a strengthening material at serviceability and ultimate limits when compared to other strengthening techniques [4].Type of performance required from particular structural element usually governs the selection of fiber type and fiber content. Different fiber types, glass, steel, polypropylene, are being commercially produced and used for various applications. Since past few decades most of the research in concrete industry has been done on studying properties and behavior of different concretes, be it normal, high strength or lightweight, after fiber inclusion. For structural concrete used in load carrying members, steel fibers of different shapes and geometry are preferred over other fiber types due to their improved post cracking performance in flexure.Current experimental work encompasses the effect of steel fiber addition on bond strength of Lightweight Fiber Reinforced Concrete (LWFC); in addition to this, effect on other mechanical properties is also discussed. Integrity of a structural element is not ensured in the absence of proper bond between the reinforcement and the concrete surrounding it. It is now established, that the bond strength is influenced by different factors, categorized by structural, geometrical and material properties. ACI 408 [5] provides a good overview of these parameters. Many of the studies [6][7][8][9][10] have discussed some of these parameters

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Analysis of the relative rib area of reinforcing bars pull out tests

Cited by 12 publications

References 1 publication

A robust design of an innovative shaped rebar system using a novel uncertainty model

A robust design of an innovative shaped rebar system using a novel uncertainty model

Parameterization of Stainless Steel Rebars to Improve Bonding Strength in Masonry Repairing

Effect of Fibers on Bond Performance of Lightweight Reinforced Concrete

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