Journal ArticleDOI
Multiscale failure analysis of fiber reinforced concrete based on a discrete crack model
TLDR
In this paper, the capabilities of an interface model to predict failure behavior of steel fiber reinforced cementitious composites (SFRCCs) are evaluated at both macro and mesoscale levels of observation.Abstract:
In this work the capabilities of an interface model to predict failure behavior of steel fiber reinforced cementitious composites (SFRCCs) are evaluated at both macro and mesoscale levels of observation. The interface model is based on a hyperbolic maximum strength criterion defined in terms of the normal and shear stress components acting on the joint plane. Pre-peak regime is considered linear elastic, while the post-peak behavior is formulated in terms of the fracture energy release under failure mode I and/or II. The well-known “Mixture Theory” is adopted for modeling the interactions between fibers and the surrounding cementitious composite. The effects of both the axial forces on the fibers induced by normal relative displacements, as well as the dowel action due to tangential relative displacements in the interfaces are considered in the formulation of the interaction mechanisms between fibers and cementitious composites. After describing the interface model, this work focuses on numerical analyses of SFRCC failure behavior. Firstly, the validation analysis of the interface model is performed at the constitutive level by comparing its numerical predictions against experimental results available in scientific literature. Then, the sensitivity of the interface theory for SFRCC regarding the variation of main parameters of the composite constituents is evaluated. Finally, the attention is focused on Finite Element (FE) analysis of SFRCC failure behavior at meso and macroscopic levels of observation. The results demonstrate the capabilities of the interface theory based on the Mixture Theory to reproduce the main features of failure behavior of SRFCC in terms of fiber content and involved fracture modes.read more
Citations
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Journal ArticleDOI
Alternative processing procedures for recycled aggregates in structural concrete
Marco Pepe,Romildo Dias Toledo Filho,Eduardus A. B. Koenders,Eduardus A. B. Koenders,Enzo Martinelli +4 more
TL;DR: In this paper, the authors investigated the influence of alternative processing procedures for recycled aggregates on the main mechanical properties of the resulting aggregates and concrete mixtures in a fresh and hardened state.
Fractures mechanisms in particle composites: Statistical aspects in lattice type analysis
TL;DR: In this paper, the effect of material microstructure on crack growth and force-deformation behavior under uniaxial tension has been investigated in an extensive numerical study, and the results indicate that strength contrast is more important than stiffness contrast, and that global behaviour is largely governed by percolation of the weakest material phase.
Journal ArticleDOI
Experimental and numerical investigation on postcracking behavior of steel fiber reinforced concrete
TL;DR: In this paper, the authors presented an experimental and numerical investigation on the postcracking strength, energy absorption and fracture energy of steel fiber reinforced concrete (SFRC) using a failure pattern based on plastic hinge and yield line theory.
Journal ArticleDOI
Modeling of fiber-reinforced cement composites: Discrete representation of fiber pullout
TL;DR: In this article, a semi-discrete approach for modeling individual fibers in cement-based materials is presented, where fibers can be positioned freely in the computational domain, irrespective of the background lattice representing the matrix phase, and the pre-and post-cracking actions of the fibers are simulated with little computational expense.
Journal ArticleDOI
Influence of natural fibers characteristics on the interface mechanics with cement based matrices
Saulo Rocha Ferreira,Saulo Rocha Ferreira,Marco Pepe,Enzo Martinelli,Flávio de Andrade Silva,Romildo Dias Toledo Filho +5 more
TL;DR: In this paper, the results of a wide series of pull-out tests carried out on sisal, curaua and jute fibers are summarized and employed in an inverse identification procedure aimed at unveiling the key features of the aforementioned bond-slip laws.
References
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Journal ArticleDOI
Crack band theory for fracture of concrete
Zdeněk P. Bažant,Byung H. Oh +1 more
TL;DR: In this article, a fracture theory for a heterogenous aggregate material which exhibits a gradual strain-softening due to microcracking and contains aggregate pieces that are not necessarily small compared to structural dimensions is developed.
Journal ArticleDOI
Plastic-Damage Model for Cyclic Loading of Concrete Structures
Jeeho Lee,Gregory L. Fenves +1 more
TL;DR: In this paper, a new plastic-damage model for concrete subjected to cyclic loading is developed using the concepts of fracture-energy-based damage and stiffness degradation in continuum damage mechanics.
Journal ArticleDOI
A new method for modelling cohesive cracks using finite elements
TL;DR: In this paper, a model which allows the introduction of displacements jumps to conventional finite elements is developed, where the path of the discontinuity is completely independent of the mesh structure.
Journal ArticleDOI
Crack propagation by element-free Galerkin methods
Ted Belytschko,Y.Y. Lu,L. Gu +2 more
TL;DR: The Element Free Galerkin method (EFG) as mentioned in this paper is a gridless gridless method for solving partial differential equations which employs moving least square interpolants for the trial and test functions.