Numerical modeling of steel fiber reinforced concrete with a discrete and explicit representation of steel fibers

Bitencourt, Luís A.G.; Manzoli, Osvaldo L.; Bittencourt, Túlio Nogueira; Vecchio, Frank J.

doi:10.1016/j.ijsolstr.2018.09.028

Cited by 66 publications

(34 citation statements)

References 28 publications

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“…e most effective technique of mitigating concrete cracking is by reinforcing shotcrete with fibers. Randomly distributed fibers in concrete provide bridging forces across cracks and thus improve the concrete strength [9][10][11][12]. So far, different types of fibers have been used in reinforced concrete.…”

Section: Introductionmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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Polyethylene terephthalate (PET) fiber from waste plastic bottles is an environmentally friendly fiber that can improve the mechanical properties of wet-mix shotcrete. The main objective of this paper is to investigate the effects of PET fiber parameters on pumpability, shootability, and mechanical properties of wet-mix shotcrete. For this purpose, the orthogonal test based on three factors and three levels was conducted. The width, length, and content of PET fiber were selected as the experimental variables. The tests of wet-mix shotcrete reinforced by PET fibers were carried out, along with properties tests such as slump, pressure drop, build-up thickness, compressive strength, and splitting strength. The results showed the change trend of shotcrete performances with increasing PET fiber parameters (width, length, and content). According to the orthogonal test, PET fiber parameters were determined (1 mm width, 20 mm length, and 5 kg/m3 content). Furthermore, relationships between slump and pumpability and shootability were explored, as well as the relationships between pumpability, shootability, and mechanical properties. It was found that pressure drop and compressive strength had the strongest negative linear relationship among all fitting relationships. We hoped that this study could contribute the useful information for the application of wet-mix shotcrete mixed with PET fibers.

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Section: Introductionmentioning

confidence: 99%

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Cui

Liu

Wang

et al. 2019

Advances in Civil Engineering

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“…Fibers are discretely and explicitly represented by truss elements embedded on the matrix and the fiber-matrix interaction is modeled by the bond-slip contact algorithm. Bitencourt Jr. (2015) and Bitencourt Jr. et al (2018b) developed a model with a discrete and explicit representation of fibers in which the matrix is represented by a continuum damage model with two distinct damage variables for modeling the tension and compression behavior. In this model the interaction between fibers and concrete is described by the use of Coupling Finite Elements (CFEs) .…”

Section: Numerical Approaches For Modeling the Post-cracking Behaviormentioning

confidence: 99%

“…In this research the numerical model based on the use of CFEs developed by Bitencourt Jr. (2015) and Bitencourt Jr. et al (2018b) is adopted to represented the SFRC post-cracking behavior. The main advantages of this approach are that the concrete, fiber and concrete-interface can be modeled separately and the use of CFEs to describe the concrete-fiber interface does not introduce additional degrees of freedom to the analysis.…”

Section: Numerical Approaches For Modeling the Post-cracking Behaviormentioning

confidence: 99%

“…In this section the numerical model used for modeling the behavior of beams with combined reinforcement of steel fibers and rebars (RC-SFRC beams) is presented. The rebars and steel fibers are modeled using the same approach by using Coupling Finite Elements (CFEs) as proposed recently by Bitencourt Jr. et al (2018b) andBitencourt Jr. et al (2018c), respectively. A new algorithm for distribution of fibers is proposed for an arbitrary specimen geometry.…”

Section: Numerical Modelmentioning

confidence: 99%

“…As previously stated, in the adopted numerical strategy proposed by Bitencourt Jr. et al, 2018b, the behavior of the concrete, steel fibers and concrete-fiber interaction is described separately. The program responsible for the generation of a cloud of fibers was improved to consider specimens with arbitrary geometries based on the concrete finite element mesh.…”

Section: General Conclusionmentioning

confidence: 99%

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Numerical modeling of the post-cracking behavior of SFRC and its application on design of beams according to fib Model Code 2010.

Trindade¹

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Código de Financiamento 001) pelo apoio financeiro, ao Programa de Pós-Graduação em Engenharia Civil da Escola Politécnica da Universidade de São Paulo (USP) pela estrutura, aos funcionários e também aos professores os quais tive o privilégio de ter aulas e adquirir conhecimento. Aos meus colegas do Laboratório de Estruturas e Materiais Estruturais (LEM) André, Marcos, Paulo Vitor, Fernanda, Tarcísio, Felipe e especialmente ao Gusta, pela amizade e a Bel pelo apoio constante, amizade e companheirismo. Finalmente, eu gostaria de dedicar essa dissertação à minha família, aos meus irmãos Carol e Marquinhos e em especial aos meus pais Marcos e Dagmar pelo apoio incondicional e por sempre incentivar e acreditar que a educação é sempre o melhor caminho. A vocês o meu eterno agradecimento.ii Abstract A finite element model with discrete and explicit representation of steel fibers is applied for modeling the post-cracking behavior of Steel Fiber Reinforced Concrete (SFRC) in order to contribute on the design of beams with combined reinforcement of steel fibers and rebars (RC-SFRC beams). In this numerical approach, concrete and fibers are initially discretized in finite elements in an independent way, avoiding high computational costs due to conforming meshes. Then, coupling finite elements are introduced to describe the concrete-fiber interaction. The steel fibers are discretized using truss finite elements and their behavior described by an elastoplastic constitutive model. The position of each fiber is defined into the specimen by an uniform isotropic random distribution using as reference the concrete finite element mesh. Concrete and concrete-fiber interface are represented using three and fournoded triangular finite elements, respectively, and their behavior represented by appropriate continuum damage models integrated using an implicit-explicit scheme to enhance the robustness and to reduce the expense of computation. Firstly, the numerical tool is applied in the simulation of three-point bending tests according to EN 14651 to verify its ability to obtain the performance parameters of SFRC and for calibrating the material parameters that describe the concrete-fiber interface. Secondly, both numerical and experimental performance parameters of SFRC are used on the design of RC-SFRC beams according to fib Model Code 2010 to study their influence on the amount of bending and shear reinforcements required. Thirdly, the RC-SFRC beams designed are numerically simulated and the results are compared to the designed ones in terms of crack width, mean crack spacing, deflection and ultimate and service loads. Finally, the numerical results of small scale beams are compared to the experimental and the fib Model Code 2010 predictions to study the capability of the numerical tool to simulate the behavior of structural members. The results demonstrated that computational simulations with an appropriated approach to represent the composite may be an important tool to contribute to better understanding its behavior, extrapolating ...

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Insight into numerical characteristics of embedded finite elements for pile‐type structures employing an enhanced formulation

Granitzer,

Tschuchnigg,

Hosseini

et al. 2023

Num Anal Meth Geomechanics

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A number of problems encountered in the field of computational geotechnics requires the modelling of numerous pile‐type structures embedded in a three‐dimensional soil continuum. Traditional modelling approaches to this problem result in computational costs that must be regarded as unbearable for most practical purposes. As an attractive alternative, we propose an enhanced embedded FE model with implicit interaction surface (EB‐I) where coupling between the contacting domains is realized by an implicit surface‐to‐volume (2D‐to‐3D) coupling scheme. As a novelty, the latter implements a non‐linear interface constitutive model that allows for explicit consideration of endpoint interaction, but does not represent a constraint for the solid mesh generation. As the slender structure is discretized employing the Timoshenko beam theory, shear deformability is explicitly considered, as opposed to earlier EB‐I‐type models reassessed in this paper. The credibility of the proposed EB‐I is numerically validated on the basis of comparative studies. It is found that the 2D‐to‐3D coupling scheme generally improves the well‐posedness of the resultant global stiffness matrix, making the proposed EB‐I computationally competitive to geometrically simplified line‐to‐volume coupling schemes. Future lines of research are carefully addressed throughout this work and include the normal stress recovery technique as well as applications to large‐scale simulations.

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Numerical modeling of steel fiber reinforced concrete with a discrete and explicit representation of steel fibers

Cited by 66 publications

References 28 publications

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Effects of PET Fibers on Pumpability, Shootability, and Mechanical Properties of Wet‐Mix Shotcrete

Numerical modeling of the post-cracking behavior of SFRC and its application on design of beams according to fib Model Code 2010.

Insight into numerical characteristics of embedded finite elements for pile‐type structures employing an enhanced formulation

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