Constitutive model for fibre reinforced concrete by coupling the fibre and aggregate interlock resisting mechanisms

Matos, Luís M.P.; Barros, Joaquim A. O.; Ventura-Gouveia, A.; Calçada, Rui

doi:10.1016/j.cemconcomp.2020.103618

Cited by 17 publications

(20 citation statements)

References 15 publications

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“…Numerous studies are focused on improving the technical, economic and environmental characteristics of concrete, the continuous flow of which confirms the relevance and complexity of the problems of increasing the competitiveness of this material . As a result of research, there are more economical components of concrete, new materials for reinforcement, and improved technologies for the manufacture of concrete as a multicomponent composite material [5][6][7]. Experimental studies are required to ensure sufficient structural reliability, but the cost remains high.…”

Section: Introductionmentioning

confidence: 99%

“…Modern methods of mathematical modeling can reduce the cost of studying concrete and other materials [8,9]. The most complete information about concrete behavior is obtained using stress-strain models, reviews of which can be found in the articles [5,10]. For a sufficiently accurate prediction of the behavior of concrete under various influences, a significant number of studies have been carried out to improve the corresponding models, which, however, remain the subject of discussion.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Concrete Failure on the Descending Branch of the Load-Displacement Curve

Kolesnikov

2020

Crystals

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In this paper, load-displacement and stress-strain diagrams are considered for the uniaxial compression of concrete and under three-point bending. It is known that the destruction of such materials occurs on the descending branch of the load-displacement diagram. The attention of the presented research is focused on the explanation of this phenomenon. Fracture mechanics approaches are used as a research tool. The method for determining effective stresses and modulus of elasticity of concrete based on the results of uniaxial compression tests has been substantiated. The ratios necessary for the calculation were obtained without any assumptions about the reinforcement of concrete and the mechanical properties of its components. However, the effect of these properties is considered indirectly, using the stress and strain peaks determined by standard concrete compression tests. It was found that the effective stresses increase both on the ascending branch and on the descending branch of the load-displacement diagram. This explains the destruction of concrete on the descending branch of the load-displacement diagram. The results of determining the stresses and modulus of elasticity under uniaxial compression are comparable with the results obtained in experiments known in the literature.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of Concrete Failure on the Descending Branch of the Load-Displacement Curve

Kolesnikov

2020

Crystals

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“…De aquí en adelante, el acrónimo R/FRC se usará para referirse a una estructura de FRC con armadura convencional. Los mecanismos de resistencia a cortante en el FRC involucran, en interdependencia mutua, al arrancamiento de fibras y al engranaje de áridos, ya que la resistencia a la apertura de fisura ofrecida por las fibras que unen las caras de la fisura aumenta la capacidad de transferencia del esfuerzo cortante debido al efecto de engranaje en los áridos [7,8]. Además, la presencia de los áridos en la fisura sometida a cortante hace que el deslizamiento relativo de las caras también produzca su apertura [9], la cual hace que las fibras se traccionen.…”

Section: Notaciónunclassified

Competición a ciegas de simulaciones numéricas de vigas de hormigón reforzado con fibras que fallan a cortante

Barros¹,

Sanz²,

Kabele³

et al. 2022

hya

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La investigación experimental ha demostrado el extraordinario potencial de la adición de fibras cortas a los materiales cementiceos, ya que mejoran significativamente el comportamiento de estructuras de hormigón en los estados límite de servicio y último. Para la simulación del comportamiento no lineal del material en estructuras de hormigón reforzado con fibras se utilizan programas informáticos basados en el método de elementos finitos. Generalmente, las aproximaciones existentes se evalúan en simulaciones de ensayos experimentales de elementos estructurales a pequeña escala, donde los valores de los parámetros de las leyes constitutivas de los materiales se ajustan según el resultado deseado. La utilidad de esta técnica inversa para el diseño estructural es discutible. Precisamente, para evaluar el comportamiento predictivo de dicho enfoque, se organizó una competición a ciegas de simulaciones numéricas. Para ello, se ensayaron hasta rotura, a flexión en tres puntos asimétrica, dos vigas gemelas de hormigón reforzado con fibras de acero de sección en T, reforzadas longitudinalmente con barras de acero y sin cercos en el vano de cortante crítico. A pesar de proporcionar los datos experimentales para la definición de los parámetros mecánicos más relevantes, las simulaciones numéricas dieron resultados dispares en la capacidad de carga, la flecha y la deformación en carga máxima, con variaciones de hasta un 40%, 113% y 600% respectivamente. Además, se obtuvieron modos de fallo y resultados muy diferentes con el mismo programa comercial pero distinto participante, lo que manifiesta la necesidad de un análisis más profundo y de una mejor comprensión de los modelos numéricos y de la influencia de sus parámetros en su capacidad predictiva.

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“…4, experimental direct shear tests, complemented with inverse analysis, is a strategy that is being attempted [54]. However, assuring pure shear conditions in experimental tests is quite challenging [55][56][57][58], since fracture mix modes are always present in the critical regions [59][60][61], therefore the reliability of the results obtained from this strategy is arguable. In consequence, it is opportune to figure out the influence of each parameter of the crack shear softening diagram on the predictive performance of the MDFSCM, namely the β parameter that, together with the τ cr t,p , define the stiffness of the pre-peak branch (see Fig.…”

Section: Parametric Study For Assessing the Influence Of The Parameters Defining The Crack Shear Softening Diagram On The Model's Predictmentioning

confidence: 99%

Assessing the applicability of a smeared crack approach for simulating the behaviour of concrete beams flexurally reinforced with GFRP bars and failing in shear

Barros

Baghi

Ventura-Gouveia

2021

Engineering Structures

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Numerical simulation of beams failing in shear is still a challenge. With the scope of verifying the applicability of smeared crack approaches to simulate the behavior of reinforced concrete (RC) beams failing in shear, a set of concrete beams reinforced with longitudinal glass fiber reinforced polymer (GFRP) bars, experimentally tested up to their failure, and comprehensibly monitored, are numerically simulated. The simulations are carried out with a multi-directional fixed smeared crack model available in the FEMIX computer program that has several options for modeling the crack shear stress transfer, which is a critical aspect when simulating RC elements failing in shear. The predictive performance of the numerical simulations is assessed in term of load vs deflection, crack pattern at failure, concrete strains in critical shear regions, and moment-curvature relationship. The influence on the predictive performance of the following modeling aspects is also investigated: finite element mesh refinement; simulation of the crack shear stress transfer by using the classical shear retention factor and a crack shear-softening diagram; bond conditions between flexural reinforcement and surrounding concrete. The simulations carried out demonstrate that small dependence of the results on the finite element mesh refinement and adequate crack patterns can be obtained with refinement levels suitable for design purposes and taking into account the actual computer performances, as long as a crack shear-softening diagram is used. However, the predictive performance of the simulations depends significantly on the values adopted for the parameters that define this diagram, as demonstrated by the performed parametric studies.

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Constitutive model for fibre reinforced concrete by coupling the fibre and aggregate interlock resisting mechanisms

Cited by 17 publications

References 15 publications

Analysis of Concrete Failure on the Descending Branch of the Load-Displacement Curve

Analysis of Concrete Failure on the Descending Branch of the Load-Displacement Curve

Competición a ciegas de simulaciones numéricas de vigas de hormigón reforzado con fibras que fallan a cortante

Assessing the applicability of a smeared crack approach for simulating the behaviour of concrete beams flexurally reinforced with GFRP bars and failing in shear

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