Modified push‐off test for analysing the shear behaviour of concrete cracks

Echegaray-Oviedo, J.; Navarro‐Gregori, Juan; Cuenca, Estefanía; Serna, Pedro

doi:10.1111/str.12239

Cited by 27 publications

(13 citation statements)

References 23 publications

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“…Similarly to q, either f c or a/d influence resulted comparable both in RC and FRC samples. These database analysis underline that fibres mainly increase the shear strength of elements by transferring stresses across inclined shear cracks and by enhancing aggregate interlock mechanism [42][43][44].…”

Section: Evaluation Of the Shear Databasementioning

confidence: 99%

A material-performance-based database for FRC and RC elements under shear loading

et al. 2018

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The shear strength of elements reinforced by fibres is predicted by Codes using formulations generally developed from a limited set of test results. In fact, only few of available test results are combined with a material mechanical characterization, allowing to evaluate and compare the different performances of Fibre Reinforced Concretes (FRC). To address this problem, a material-performance-based shear database for FRC elements and their related reference samples in Reinforced Concrete (RC, with and without web reinforcement) is presented herein, merging the experiences carried out in the last decade at the University of Brescia and at the Universitat Politècnica de València. The database is composed by 171 specimens: 93 in FRC and 78 in RC with or without web reinforcement. For FRC elements, the postcracking resistance (f R,1 and f R,3 ) is also given according to EN 14651 standard. The evaluation of the shear database was also carried out, discussing the influence of the different factors affecting the shear strength both in FRC and RC samples. Finally, the two formulations suggested by Model Code 2010 for FRC elements are compared against the database results in order to shed new light on code requirements.

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Section: Evaluation Of the Shear Databasementioning

confidence: 99%

A material-performance-based database for FRC and RC elements under shear loading

et al. 2018

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“…Echegaray-Oviedo et al [40] also proposed a modified version of the push-off test for initially cracked specimens. The initial crack can be controlled, one of the reasons why is difficult to compare results amongst different push-off experiments.…”

Section: Fig 8 Typical Hofbeck Test Specimenmentioning

confidence: 99%

“…Since the slip displacement is also controlled, it is possible to analyse the micro and macroroughness at the crack faces. Echegaray-Oviedo et al [40] mention that better understanding of these conditions can also lead to insights on size effects.…”

Section: Fig 8 Typical Hofbeck Test Specimenmentioning

confidence: 99%

A Review on the Developments of Peridynamics for Reinforced Concrete Structures

Hattori

Hobbs

Orr

2021

Arch Computat Methods Eng

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Concrete is the most widely used man made material in the world. Reinforced with steel, it forms a key enabler behind our rapidly urbanising built environment. Yet despite its ubiquity, the failure behaviour of the material in shear is still not well understood. Many different shear models have been proposed over the years, often validated against sets of physical tests, but none of these has yet been shown to be sufficiently general to account for the behaviour of all possible types and geometries of reinforced concrete structures. A key barrier to a general model is that concrete must crack in tension, and in shear such cracks form rapidly to create brittle failure. Peridynamics (PD) is a non-local theory where the continuum mechanics equilibrium equation is reformulated in an integral form, thereby permitting discontinuities to arise naturally from the formulation. On the one hand, this offers the potential to provide a general concrete model. On the other hand, PD models for concrete structures have not focussed on applications with reinforcement. Moreover, a robust model validation that assesses the strengths and weakness of a given model is missing. The objectives of this paper are twofold: (1) to evaluate the benchmark tests involving shear failure for RC structures; and (2) to review the most recent PD theory and its application for reinforced concrete (RC) structures. We investigate these models in detail and propose benchmark tests that a PD model should be able to simulate accurately.

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“…In this way, when comparing RC and FRC elements, and in the same load stages, fibres reduce both crack slip and crack opening by theoretically enhancing the aggregate interlock effect for longer periods. Several research works [10,67,[94][95][96] have been conducted to determine the effect of fibres on shear transfer. Most of them have been conducted with small elements under direct shear, like push-off specimens, FIP shear tests or Japanese shear tests.…”

Section: Aggregate Interlockmentioning

confidence: 99%

“…Further details about the components of both the external frame and instrumentation can be found in [94,127].…”

Section: Instrumentationmentioning

confidence: 99%

Effectiveness of polypropylene fibres as shear reinforcement in structural elements

Navas¹,

Roberto²

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Several efforts have been made in experimental and theoretical research about shear to understand all the variables that influence the phenomenon. Nowadays, however, due to its complexity, the shear performance of structural concrete elements, especially those without any traditional transversal reinforcement, continue with no clear explanation of the problem. Uncertainty about the problem grows when new variables like fibres are incorporated into the shear study.Research works have demonstrated the effectiveness of steel fibre in improving the mechanical properties of concrete elements. Experimental results reveal that steel fibres have proven effective in improving shear resistance, and they confer some concrete elements more ductility. In adequate amounts, steel fibres can completely or partially substitute traditional shear reinforcements. This is why international codes have included some requirements to take into account the action of fibres on the shear response of concrete elements. However, most recommendations and requirements for steel fibre-reinforced concrete (SFRC) were originally created.New fibres with different materials properties and shapes, such as macrosynthetic fibres, are now available on the market. These fibres, some of which are made of polypropylene, are an alternative in the construction industry given their properties and final cost. Initially, polypropylene fibres were used to control shrinkage cracking. Nevertheless, in the last decade the chemical industry has created larger fibres with better surface shapes, which allows polypropylene fibres to meet the requirements of international codes so they can be used in structural elements.Per avaluar l'efectivitat de les fibres de polipropilè en el tallant, es realitzaran tres campanyes experimentals. Cada campanya representa un nivell d'estudi diferent. El primer és a nivell material on s'avalua el comportament a tallant a través d'espècimens tipus Push-off. El segon nivell, correspon a l'estudi del tallant en elements a escala real. Per això es fabriquen i assagen bigues esveltes crítiques a tallant. L'últim nivell correspon a una aplicació real de fibres de polipropilè actuant com a reforç a tallant. En aquesta campanya, es fabriquen i assagen plaques alveolars de gran cantell amb seccions i condicions de suports reals.

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Modified push‐off test for analysing the shear behaviour of concrete cracks

Cited by 27 publications

References 23 publications

A material-performance-based database for FRC and RC elements under shear loading

A material-performance-based database for FRC and RC elements under shear loading

A Review on the Developments of Peridynamics for Reinforced Concrete Structures

Effectiveness of polypropylene fibres as shear reinforcement in structural elements

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