M. Matallah

M. Matallah
Abou Bakr Belkaid University of Tlemcen · Département de Génie Civil

Professor PhD
Professor (Full) University of Tlemcen

About

77
Publications
17,114
Reads
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666
Citations
Introduction
PhD from university of Pau France. Since 2009, i am lecturer at the University of Tlemcen Algeria with interest in "Computer & GeoMechanics" , Fracture and Hydraulic Fracture in quasi-brittle materials, seismic risk and earthquake engineering.
Additional affiliations
July 2017 - present
Abou Bakr Belkaid University of Tlemcen
Position
  • Professor (Full)
July 2017 - present
Abou Bakr Belkaid University of Tlemcen
Position
  • Professor (Full)
January 2010 - July 2017
Abou Bakr Belkaid University of Tlemcen
Position
  • Professor (Associate)
Education
November 2006 - December 2009
Université de Pau et des Pays de l'Adour
Field of study
  • Civil Engineering
November 2002 - October 2006
Université de Pau et des Pays de l'Adour
Field of study
  • Civil Engineering
September 2001 - July 2002
Ecole Centrale de Nantes
Field of study
  • Civil Engineering

Publications

Publications (77)
Article
The Peak Ground Acceleration (PGA) is extensively used in earthquake engineering practice to describe the ground motion characteristics for establishing the seismic vulnerability curves. However, a single parameter is not enough to describe the seismic excitation and does not allow expressing the complex relationship between the structural damage a...
Article
Full-text available
Water-driven fracture propagation is a fundamental issue in the failure analysis of cracked concrete gravity dams. In the present paper, a poromechanical-damage–based model is proposed to study the water-fracture interaction in saturated porous media in order to highlight the importance of considering the presence of the pressurized water in propag...
Technical Report
Full-text available
Rapport interne "Modélisation numérique des transferts hydriques dans les milieux poreux fissurés" AGENCE : Agence nationale pour la gestion des déchets radioactifs (ANDRA)
Article
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The paper reports the results of a numerical investigation on the relevance of including bar slip, bar buckling and low-cycle fatigue in seismic fragility assessment of RC bridge piers. The numerical study is completed on a series of well-confined circular RC bridge column with different configurations where the main variables included are the long...
Article
Full-text available
This study investigates the impact of aggregate and pipe cooling systems on concrete behaviour at a mesoscale level. Firstly, a Chemo-Thermo-Mechanical model is developed to investigate the initial stress state of early age hydration concrete followed by a mechanical analysis of the consequences brought by this initial state. Pipe and aggregate coo...
Article
Full-text available
Pour les barrages en béton compacté au rouleau BCR, et tenant compte des volumes importants de béton, des gradients thermiques se développent durant la phase de réalisation et se poursuivent pendant l'exploitation de l'ouvrage, provoquant une dilatation thermique du parement aval par rapport au parement amont qui se contracte. Il s'en suit une déf...
Technical Report
Full-text available
Internal report " Les ondes de choc- Shock waves " - Tight gas project
Article
Full-text available
It is commonly accepted that multi-scale structures are subject to spatially variable seismic motions. This spatial variability of seismic motions is described by different intensities at different locations due to the coherency loss effect, wave passage effect and local site conditions. For multi-scale structures, the estimation of seismic excitat...
Article
Full-text available
This paper deals with a mesomechanical modeling of fracture in concrete like quasi-brittle materials. The paper seeks to provide insight regarding the variation of the fracture process zone (FPZ) length during the cracking process. The correlation between the FPZ length and the crack extension is also investigated. The FPZ variation is investigated...
Thesis
Full-text available
This work deals with the failure analysis by plastic limit analysis using mathematical tools of linear optimization. A reasonable and less empirical approach based on efficient numerical tools. Thanks to the relatively recent development of linear and non-linear programming solvers, the approaches (static and kinematic) of plastic limit analysis co...
Article
This paper deals with a mesomechanical modeling of fracture in concrete like quasi-brittle materials. The paper seeks to provide insight regarding the variation of the fracture process zone (FPZ) length during the cracking process. The correlation between the FPZ length and the crack extension is also investigated. The FPZ variation is investigated...
Article
Full-text available
The evaluation of the seismic hazard for a given site is to estimate the seismic ground motion at the surface. This is the result of the combination of the action of the seismic source, which generates seismic waves, the propagation of these waves between the source and the site, and site local conditions. The aim of this work is to evaluate the se...
Conference Paper
Full-text available
It is widely accepted that extended structures are subject to seismic ground motion that vary in space and time. The spatial and temporal variations of ground motion can significantly affect the seismic response of these structures. The spatial variability of seismic ground motions results from the combination of seismic wave propagation between th...
Conference Paper
Full-text available
The evaluation of the seismic response of extended structures consists to estimate the earthquake ground motion which is variable in space and time. The ground motion observed at the surface results from the combination of the seismic wave propagation between the source and the site, and particularly the local geotechnical site conditions. These fa...
Article
Full-text available
In seismic zones, arch dames are the most feasible when the geology and the integration of ancillary structures allow it. Arch dams postpone the hydrostatic push on the foundation by bows (under compression). It is the slenderness of the valley, the geometry of the arch, and the contrast of rigidity between the concrete and the rock that determine...
Article
Full-text available
Under seismic loading, some structural elements are subjected to combined solicitations (bending-shear for instance). The flexural ductility of a reinforced concrete element reduces its shear capacity. In fact, during plastic dissipation (by cracking), the transfer mechanisms of the shear force are impacted, which can lead to a brittle failure. The...
Article
The present paper aims at introducing the constrained spline Finite Strip Method (csFSM). The proposed approach is basically a spline Finite Strip Method (spline FSM) that allows the modal decomposition. Similarly to the constrained Finite Strip Method (cFSM), some mechanical assumptions are made in order to constrain the general spline FSM model t...
Conference Paper
Full-text available
The ductility is an important parameter in the seismic design process of RC structures. The non-linear seismic analysis could be performed using a global approach based on the consideration of plastic hinges zones. For RC elements under bending, the non-linearity of these dissipative zones is described by the moment-curvature laws (or moment-rotati...
Article
Full-text available
The ductility is an important parameter in the seismic design process of reinforced concrete structures. Under seismic loadings, ductility is required to allow a significant deformation and energy dissipation before the collapse. The plastic design of RC elements under bending loads is based on the formation of plastic hinges. The dissipation is ch...
Article
Full-text available
ABSTRACT The shear strength of reinforced concrete beam remains an issue of great interest in structural engineering. For structural members without transverse reinforcements, the application of simple models (Strut and tie model, for instance) results an unsafe design. Also, most of the design codes are based on empirical formulas to design such m...
Article
The description of the concrete behavior under dynamic loadings (explosions, collisions, earthquakes...) is the subject of several research. Although modeling remains complex for the concrete because of the ending of several phenomena (the damage, viscosity, inertia, cracking...), several approaches have been proposed hinging upon each one or two o...
Thesis
Full-text available
Sizes of real life civil engineering RC structures are much larger than those of laboratory specimens. This scaling phenomenon can cause many design problems. Do not take into account the size effect in structural design leads to a bad estimation of the real capacity. In practical engineering, modeling of the nonlinear behavior of structures under...
Article
Following the concept of design capacity, the main purpose of the structural design of RC elements is to avoid brittle failures and to ensure ductile behavior. Under cyclic loading, the shear strength is reduced by increasing the flexural ductility. A good estimation of the failure mode of RC elements exhibiting a shear-flexural interaction relies...
Conference Paper
Full-text available
The coupling between cracking and permeability of geomaterial members such as concrete and rock is of great interest for numerous problems. In most case the structure is wanted to be tight in order to prevent fluid or gas to migrate, this is as an example the case of nuclear waste disposals, nuclear plant confinement vessels, or other simple civi...
Conference Paper
Full-text available
Dans le cadre du concept de dimensionnement en capacité, le but principal de la conception structurelle des éléments en BA est d'éviter les ruptures fragiles et d'assurer un comportement ductile. Sous chargement cyclique, la résistance au cisaillement diminue quand la ductilité flexionnelle augmente. Une bonne estimation du mode de rupture des élém...
Conference Paper
Full-text available
Dans le cadre du concept de dimensionnement en capacité, le but principal de la conception structurelle des éléments en BA est d'éviter les ruptures fragiles et d'assurer un comportement ductile. Sous chargement cyclique, la résistance au cisaillement diminue quand la ductilité flexionnelle augmente. Une bonne estimation du mode de rupture des élém...
Article
Full-text available
The size effect or scaling phenomenon is a fundamental problem when dealing with fracture of geomaterials. Concrete is considered as one of world's most widely used construction materials. The design in civil engineering of structural concrete should take into account the size effect when extrapolating the experimental tests at laboratory scale to...
Article
Full-text available
The main objective of this paper is to study the size effect on the fracture characteristics in concrete structures. The numerical investigation is based on a mesoscale modeling approach. Analytically, two size effect laws are investigated: the classical Bažant SEL and a new size effect law based on the enrichment of the stress field on the crack t...
Conference Paper
Full-text available
The ductility is a very important parameter in the seismic design process of reinforced concrete structures. Under seismic loading, ductility is required to allow a significant deformation and energy dissipation before the collapse. The plastic design of beams under bending-loads is based on the formation of plastic hinges. The dissipation is chara...
Conference Paper
Full-text available
The ductility is a very important parameter for reinforced concrete design. It is required in order to allow moment redistribution in indeterminate structures and avoid unstable crack propagation. In seismic design with ductility consideration, for establishing the moment-curvature curves, the Eurocode 8 adopts the Panagiotakos and Fardis formulati...
Article
In this paper, the fracture process zone (FPZ) is investigated on unnotched and notched beams with different notch depths. Three-point bending tests have been realized on plain concrete under crack mouth opening displacement (CMOD) control. Crack growth is monitored by applying the acoustic emission (AE) technique. The comparison with a numerical m...
Presentation
Permeability-Cracking Coupling within the Framework of Poromechanics.
Conference Paper
Full-text available
L'objectif de ce travail est de montrer la capacité des approches d'effet d'échelle à déterminer les caractéristiques du béton. Deux lois d'effet d'échelle sont utilisées : la loi SEL de Bazant ainsi qu'une autre loi d'effet d'échelle MMTS. Les bases de ces deux approches sont décrites brièvement. Des résultats expérimentaux récemment effectués sur...
Conference Paper
Full-text available
As it is well-known, using damage models or damage-plastic models in computational failure analysis leads automatically to mesh dependency. This numerical aspect is originally caused by the loss of ellipticity of the local equilibrium equations (under static loading). Various regularization techniques are used to restore the objectivity of the mech...
Article
Full-text available
Dans ce travail, la technique de régularisation énergétique basée sur l'approche Crack Band est étudiée. L'objectif principal de ce travail est d'identifier les sources d'erreurs liées à l'utilisation de cette approche dans le cas d'un calcul de structure générant des états de contraintes bidimensionnel ou tridimensionnel. La prise en compte de la...
Research
Full-text available
In the present work, the authors propose an inelasticity-damage based approach. The basic idea is that inelasticity in concrete is described by a second order tensor coupled in a particuler manner with a scalar damage avriable to reproduce the crack induced anisotropy and the unilateral effect.
Research
Full-text available
A new variable called the Unitary Crack Opening variable is introduced to describe the cracking process. The coupling with damage variable taken as scalar leads to a good description of the crack induced anistropy. The unilateral effect is naturally taken into account thanks to this particuler coupling.
Data
Full-text available
Conference Paper
Full-text available
Résumé Dans ce travail, l'effet d'échelle des structures en béton est étudié avec une approche numérique basée sur une modélisation mésoscopique ainsi qu'avec la mécanique de la rupture. Une loi d'effet d'échelle basée sur l'enrichissement du champ de contraintes au pointe de la fissure est utilisée. L'objectif principal de ce travail est de contri...
Article
Full-text available
The objective of this study is to simulate the propagation of the shock wave in water due to an explosion. The study is part of a global research program on the development of an alternative stimulation technique to conventional hydraulic fracturing in tight gas reservoirs aimed at inducing a distributed state of microcracking of rocks instead of l...
Article
Full-text available
The strength of the cement-based materials increases with time due to the increase of the formed hydrates. During to the hydration process, micro-stresses occur due to the shrinkage of the cement paste. The characterization of the restrained shrinkage deformation at very early ages could be done by applying an equivalent load (creep type). Based on...
Conference Paper
Concrete is a heterogeneous material that develops delayed strains under a constant load. These deformations are related to micromechanisms which occur in its microstructure. To model this behaviour, a new numerical multi-scales method is suggested. Based on a method for the calculation of the effective response for a non-aging material, an extensi...
Conference Paper
Full-text available
Cracks, caused by shrinkage or external loading, reduce the durability of concrete structures as aggressive substances can easily enter in the capillary network of the cementitious matrix. Natural ‘autogenous’ healing ability of concrete by further hydration or precipitation has been studied experimentally for many years. Autogenous healing of conc...
Conference Paper
Full-text available
In this paper, the fracture characteristics of concrete at very early ages are investigated. Experimentally , three point bending tests are performed on notched beams at very early-ages (before 24 h) and the Load-CMOD curves are obtained. In order to find the trend of the evolution of the fracture energy, an inverse analysis procedure is developed....
Conference Paper
The objective of this paper is to achieve buckling modes decomposition for prismatic members via the well-known spline finite strip method (SFSM) which was successfully used to predict the buckling loads of thin-walled plate assemblies under arbitrary loading and for various boundary conditions. Two assumptions are used to define the combined buckl...
Article
The decomposition of buckling modes of thin-walled members subjected to axial stresses is a topic of great practical interest which can be achieved using the generalised beam theory (GBT) or the constrained finite strip method (cFSM). However, the latter is not general enough to study prismatic members with arbitrary cross-sections and the objectiv...
Article
In its service-life concrete is loaded and delayed strains appear due to creep phe- nomenon. Some theories suggest that micro-cracks nucleate and grow when concrete is submitted to a high sustained loading, thereby contributing to the weakening of concrete. Thus, it is important to understand the interaction between the viscoelastic deformation and...
Article
Full-text available
The decomposition of buckling modes of thin-walled members subjected to axial stresses is a topic of great practical interest which can be achieved using the generalised beam theory (GBT) or the constrained finite strip method (cFSM). However, the latter is not general enough to study prismatic members with arbitrary cross-sections and the objective...
Conference Paper
Full-text available
In its service-life concrete is loaded and delayed strains appear due to creep phenomenon. Some theories suggest that micro-cracks nucleate and grow up when concrete is submitted to a high sustained loading, which contribute to make the concrete weaker. Thus, it is important to understand the interaction between the viscoelastic deformation and...
Article
Full-text available
This article discusses the influence of compressive shock waves on the permeability of cementitious materials. Shock waves are generated in water by Pulsed Arc Electrohydraulic Discharges (PAED). The practical aim is to increase the intrinsic permeability of the specimens. The maximum pressure amplitude of the shock wave is 250MPa. It generates dam...
Article
The aim of this paper is to present a modelling of mechanical behaviour of concrete on a mesoscopic scale. Concrete is considered as a bi-phasic material where the cement paste and the aggregates are described with their own mechanical characteristics. Firstly, the model is studied in two dimensions in order to optimize the geometrical model of the...
Article
Full-text available
This paper deals with the development of a model for concrete subjected to dynamic loads. Shock waves are generated by Pulsed Arc Electro-hydraulic Discharges (PAED) in water and applied to mortar samples. A diphasic model (liquid water and vapour) is implemented in order to describe the electrical discharge and the propagation of shock waves in wa...
Conference Paper
Full-text available
This paper focuses on the microstructure and transfer properties of mortar subjected to dynamic loads. The evolution of cracking and damage due to dynamic mechanical loads are correlated with the intrinsic permeability of the material and with its microstructure. Permeability increases both with the number of shocks and with their pressure level. A...
Article
The objective of this article is to present an experimental study of pulsed arc electrohydraulic discharges (PAED) in water. The aim is to produce dynamic shock waves in order to increase the intrinsic permeability of mortar specimens which are immersed in water. The experimental set up allows the switching of high pulsed energy up to 100kJ in orde...
Article
Full-text available
This paper deals with the development of a continuum inelasticity damage-based model. The aim is to describe the behavior of plain and reinforced concrete under monotonic and cyclic loading. We consider that inelasticity is due to micro-crack openings, and that the material recovers its original elastic modulus when all micro- cracks are closed. We...
Article
Full-text available
Numerical modelling of concrete cracking requires robust models able to describe opening and propagation of cracks. Structural concrete codes provide practical relations to describe crack openings. However, these empirical methods were developed for specific structures and cannot be used for general applications. Here, a continuous modelling approa...