L'effort trenchant dans la modélisation du comportement jusqu' à rupture des pouters en béton armé et précontraint

Kachi, Mohand Said; Foure, B; Bouafia, Youcef; Müller, Patrick

doi:10.1080/17747120.2006.9692914

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…This is probably the reason why it was ignored or poorly dealt with in most of the earliest design codes. However, it seems that the shear strength can be well predicted using rather sophisticated methods, applicable by means of a computer program, such as for example the Modified Compression Field Method (see, e.g., Vecchio and Collins, 3 Bhide and Collins, 4 or more recently Kachi et al 5 ). However, the problem of designing a member is not so well resolved; so the more or less simple formulas proposed by the design codes are still questionable.…”

mentioning

confidence: 99%

Influence of axial tension on the shear strength of RC beams without stirrups

Pham

Foure

Pinoteau

et al. 2020

Structural Concrete

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This contribution is addressing the investigation on the effect of axial tension on the shear strength of reinforced concrete beam elements without stirrups.The paper presents the results of a test program of 15 beams without stirrups that differed from each other mainly by the intensity of the axial tensile force N. During the tests, cracking was measured by Digital Image Correlation technique to identify the crack evolution mechanisms. After some consideration on the resisting mechanisms, the experimental results are compared with several code formulas to predict the shear strength V Rc . Then an empirical formula is proposed for the variation of V Rc between its two limits: the values for N = 0 and for V Rc = 0 at the ultimate limit state of axial tension. This formula makes it possible to easily design for shear and tension.

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mentioning

confidence: 99%

Influence of axial tension on the shear strength of RC beams without stirrups

Pham

Foure

Pinoteau

et al. 2020

Structural Concrete

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“…This is probably the reason why it was ignored or poorly covered in most of the earliest design codes. The shear strength can be well predicted using rather sophisticated methods such as for example the Modified Compression Field Method (MCFT) (Vecchio and Collins, 3 more recently Kachi et al 4 and Bhide and Collins 5 for shear and axial tension). However, the problem of designing a member is not so well resolved and the more or less simple formulas proposed by the design codes are still questionable as regard to the influence of axial tension.…”

mentioning

confidence: 99%

Influence of axial tension on the shear strength of transversally reinforced concrete beams

Pham

Foure

Pinoteau

et al. 2020

Structural Concrete

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This contribution is addressing the investigation on the effect of axial tension on the shear strength of transversally reinforced concrete beams. It presents the results of a test program of 27 beams with different amounts of shear reinforcement subjected to varying levels of axial tension. After a general discussion about the truss model, the experimental shear strength results from the present study along with the results from some previous studies are analyzed, mainly with respect to the ultimate angle of the concrete struts. Then, several design codes are discussed in order to assess their practical validity, and finally a new method is proposed for the design of the longitudinal and transverse reinforcements, valid irrespective of the levels of the axial tensile force.

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“…he study of a cracked element subjected to the shear force consists on separately analyzing the materials constituting this element (concrete, steel). To solve the problem, it will be used the equilibrium equations, the compatibility equations and the constitutive laws of the different materials [14]. The longitudinal strain x  is a linear function of the y ordinate, responding to the cross-section Navier-Bernoulli hypothesis and expressed as follows:…”

Section: Calculation Procedures For a Cross Section In Reinforced And/or Prestressed Concretementioning

confidence: 99%

“…y y ay by (14) The overall equilibrium of the sections is expressed by the equality of the external loads N, M, V and the resultants of the internal loads int…”

Section: Calculation Procedures For a Cross Section In Reinforced And/or Prestressed Concretementioning

confidence: 99%

“…This proposed approach admits that the cracking of a panel can occur by plasticization of the transverse and longitudinal reinforcements and cracking of the concrete before plasticization of the reinforcements. Kachi et al [14] continue the work of Grelat [15] and Nait-Rabah [16], showed in their model that the stress in concrete in the transverse direction is a compressive stress; they studied each section subjected to the bending moment, the normal force and the shear force in nonlinear elasticity in the case of the reinforced and prestressed concrete beams. The developed program has been validated on several reinforced and prestressed concrete beams which have been the subject of experimental tests.…”

Section: Introductionmentioning

confidence: 97%

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Reliability assessment of the behavior of reinforced and/or prestressed concrete beams sections in shear failure

Benyahi

Kachi

Bouafia

et al. 2021

Frattura Ed Integrità Strutturale

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The object of this article is to be able to simulate the behavior of reinforced and/or prestressed concrete beam’s section in the shear loading through a model allowing the evaluation of nonlinear strains caused by shear, while taking into account the real behavior of the materials. In this approach, we are often confronted with problems of modeling uncertainties linked to some insufficiencies of the mechanical model allowing to describe the physical phenomena in a realistic way. For that, it is necessary to use a reliability model making it possible to evaluate their probability of failure, by establishing failure curves according to the different transition zones of the limit state curve of the nonlinear behavior in the shear loading up to at section failure of reinforced and/or prestressed concrete beams. In this work, we also propose a coupling of the reliability method by response surface to carry out the reliability optimization on complex mechanical models, where the mechanical and reliability models developed have been implemented on the Fortran. This allows the estimation in an efficient way of the different reliability characteristics according to each transition zone from the limit state curve to the real behavior until failure in the shear loading.

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L'effort trenchant dans la modélisation du comportement jusqu' à rupture des pouters en béton armé et précontraint

Cited by 8 publications

References 6 publications

Influence of axial tension on the shear strength of RC beams without stirrups

Influence of axial tension on the shear strength of RC beams without stirrups

Influence of axial tension on the shear strength of transversally reinforced concrete beams

Reliability assessment of the behavior of reinforced and/or prestressed concrete beams sections in shear failure

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