Valorisez vos réalisations phares sur People@HES-SO Plus d'infos
PEOPLE@HES-SO – Annuaire et Répertoire des compétences
PEOPLE@HES-SO – Annuaire et Répertoire des compétences

PEOPLE@HES-SO
Annuaire et Répertoire des compétences

Aide
language
  • fr
  • en
  • de
  • fr
  • en
  • de
  • SWITCH edu-ID
  • Administration
ID
« Retour
Bennani Abdelkrim

Bennani Abdelkrim

Responsable d'institut de recherche

Compétences principales

Dynamique des structures

vibration

flambage

Essais sur materiaux et structures

Matériaux biosourcés

Recyclage terres excavées

Liants alternatifs bas carbone

  • Contact

  • Enseignement

  • Recherche

  • Publications

  • Conférences

Contrat principal

Responsable d'institut de recherche

Bureau: CR11D

Haute école du paysage, d'ingénierie et d'architecture de Genève
Rue de la Prairie 4, 1202 Genève, CH
hepia
Domaine
Architecture, construction et planification
Filière principale
Génie civil

Professeur-e HES ordinaire

Bureau: CR11D

Haute école du paysage, d'ingénierie et d'architecture de Genève
Rue de la Prairie 4, 1202 Genève, CH
hepia
Domaine
Architecture, construction et planification
Filière principale
Génie civil
MSc HES-SO en Engineering - HES-SO Master
  • Dynamique des structures
BSc HES-SO en Génie civil - Haute école du paysage, d'ingénierie et d'architecture de Genève
  • Atelier matériaux
  • statique des structures
  • Systèmes hyperstatiques

En cours

Ressources minérales alternatives pour la fabrication de liants cimentaires à faible empreinte carbone : Applications aux matériaux de constructions durables.
AGP

Rôle: Requérant(e) principal(e)

Financement: HES-SO Rectorat

Description du projet : Ce projet de Ra&D s'inscrit dans une démarche de réduction de l'empreinte carbone dans le domaine de la construction, de la préservation des ressources naturelles non renouvelables ainsi que du recyclage de déchets issus de la filière d'approvisionnement en matières minérales. Ce projet vise à initier un modèle d'économie circulaire dans l'industrie de la construction permettant de répondre aux enjeux environnementaux liés à l'accumulation de matières minérales issues de déchets. Le projet CO2RED a pour objectif principal de démontrer la faisabilité de valoriser les fines de lavages issues de l'exploitation des carrières (actuellement très peu ou non valorisées) par : ' Le développement de liants alternatifs à faible empreinte carbone, peu coûteux et présentant des performances adaptées aux exigences du marché, et à proposer : o Une nouvelle voie de réduction du taux de clinker dans les mortiers et bétons. o Une alternative aux laitiers de hauts fourneaux o Une alternative sans ciment pour la stabilisation de la terre crue ' Leur incorporation dans les sables pour la confection de mortiers et bétons, afin d'obtenir une nouvelle gamme de sables à fines pouzzolaniques, préservant ainsi cette matière première indispensable mais limitée. Ce projet contribuera notamment à atteindre des objectifs sociaux, écologiques et économiques en fournissant une stratégie de valorisation qui réduira le stock de déchets minéraux, évitera l'engorgement des sites de stockage. Actuellement, les 5 millions de tonnes de boues de lavage produites chaque année en Suisse sont éliminées en décharge ou retournées sur le site d'extraction pour y être stockées.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim , Fazio Florian , Leduc Louise , Viviani Marco , Franciosi Mattia , Iotti Simone , Schaller Alexandre

Partenaires académiques: INSIT; HEPIA inPACT

Durée du projet: 01.01.2025 - 30.10.2026

Montant global du projet: 220'000 CHF

Statut: En cours

Développement de briques de terre extrudées non cuites

Rôle: Requérant(e) principal(e)

Description du projet :

L’industrie suisse de la terre cuite fabrique environ 350'000 tonnes de produits par an. Cela en fait une industrie forte, créatrice d’emploi et perpétuant un grand savoir-faire. Cependant, la dernière crise énergétique a très fortement affecté cette industrie d’une manière générale, car elle dépend de l’importation du gaz naturel pour alimenter ses fours industriels afin de cuire les briques. Cette industrie subit depuis plusieurs mois une hausse constante du prix d’achat du gaz auprès de ses fournisseurs qui sont incapables de s’engager sur des prix fixes étant donné la volatilité du marché et les incertitudes liées à la situation politique des principaux fournisseurs européens. Cette hausse du prix du gaz a une répercussion directe sur le prix de vente des produits en terre cuite. En effet, les industriels ont dû annoncer des hausses conséquentes à leur clientèle. Cette situation pousse à l’importation de produits de construction étrangers meilleur marché, et met sérieusement en péril l’activité des briquetiers, qui ont déjà dû mettre en œuvre des mesures urgentes d’assainissement (fermetures temporaires des usines, licenciements).

Le but de ce projet est d’accompagner TFL (Tuileries Fribourg & Lausanne SA), producteur de briques de terre cuite à Crissier (VD) dans une démarche plus environnementale en proposant une solution alternative avec des briques sans processus de cuisson, à savoir des briques de terre crue.

Le processus de fabrication des briques se fait par extrusion, via une mouleuse. L’étape de cuisson permet un gain de résistance mécanique et à l’eau (liquide et humidité ambiante). La problématique est donc de savoir s’il est possible d’utiliser les briques telles quelles, sans cuisson et sans aucune modification de composition, ou s’il faudrait la modifier.

Ainsi, la grande force de ce projet réside dans:

  • L’utilisation de ressources naturelles locales et largement disponibles;
  • L’arrêt de l’utilisation du ciment;
  • La réduction des importations de matériaux de construction de l’étranger;
  • La réduction très importante de l’impact environnemental des produits proposés (en termes d’énergie non renouvelable et d’émissions de CO2 équivalentes).

Pour cela, il a fallu

  • d’un point de vue scientifique comprendre l’influence de la composition et de la forme de la brique en terre «crue» sur la résistance mécanique de l’élément tout comme du mur qu’il va constituer
  • et d’un point de vue technique:
    • Définir la forme optimale adaptée à la terre «crue» que le partenaire peut produire au niveau industriel;
    • Définir la composition optimale de la brique de terre «crue» que le partenaire peut produire au niveau industriel;
    • Tester la stabilité de murs en terre crue et leur robustesse vis-à-vis de leur usage;
    • Tester divers types de finitions des murs (enduits, crépis, peintures) pour garantir leur tenue dans le temps;
    • Garantir les bonnes propriétés acoustiques des murs;
    • En déduire les applications possibles dans le bâtiment avec ces nouveaux produits.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim

Partenaires professionnels: TFL; TERRABLOC

Statut: En cours

Validation d’un concept de construction modulaire en béton

Rôle: Requérant(e) principal(e)

Description du projet :

Cette étude valide un nouveau système de construction modulaire en béton développé par Cubik Home et Francioli. La recherche combine des tests en laboratoire, des essais grandeur nature et des simulations numériques. L'étude examine plusieurs aspects:

  • Les propriétés d'un béton fibré haute performance.
  • Son comportement au séchage.
  • Sa résistance au feu (non-éclatement et écaillage limité).
  • Son comportement après fissuration, particulièrement important pour les structures minces.

Des modèles numériques ont été développés pour simuler le comportement de ce béton fibré. Ces modèles ont ensuite été validés par des tests sur différents éléments structurels (dalles et murs minces nervurés). Les connexions entre éléments ont été testées en traction et cisaillement.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim

Statut: En cours

Isolants biosourcés à base d'un mélange granulats-végétales/fibres-végétales/liant

Rôle: Requérant(e) principal(e)

Description du projet :

Les recherches menées visent à créer une nouvelle gamme de matériaux de construction basée sur des ressources agricoles durables, en étudiant comment différents granulats végétaux (Miscanthus, Colza, Tournesol, Chanvre) peuvent être mélangés pour concevoir des matériaux de construction renouvelables et locaux, ouvrant ainsi la voie à des pratiques plus durables dans les secteurs de l’agriculture et de la construction. Les objectifs poursuivis étant de :

  • Caractériser les granulats végétaux pertinents et disponibles.
  • Formuler des bétons végétaux en prenant exemple sur les préconisations du béton de chanvre.
  • Caractériser ces bétons à l’état frais, après cure et après séchage.
  • Comparer les performances des bétons issus des mélanges de granulats avec ceux des formulations monomatières

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim

Statut: En cours

Béton fibré autoplaçant à haut volume en fibres: formulation et caractérisation

Rôle: Requérant(e) principal(e)

Description du projet :

L’objectif de cette étude est de formuler un béton fibré à haut volume en fibres acier et d’évaluer ses caractéristiques mécaniques. L’objectif principal est d’améliorer le comportement post-fissuration du béton sous traction, avec notamment la diminution de la chute de contrainte généralement observée. Un haut volume en fibres métalliques est visé afin d’inhiber le régime adoucissant et de tenter d’obtenir un régime écrouissant (écrouissage positif) en régime post-fissuré. Généralement, le problème est qu’au-delà d’une certaine teneur en fibres, le béton n’est plus autoplaçant et sa plasticité fortement dégradée ce qui le rend inutilisable pour des éléments préfabriqués en raison de la nécessité de couler le béton rapidement. Le critère autoplaçant est donc primordial, et la formulation et l’adjuvantation devront permettre sa vérification. L’approche consiste à améliorer la formulation classique du béton utilisé dans une usine de préfabrication ou une centrale à béton donnée et à la perfectionner pour obtenir un béton fibré autoplaçant à fort volume de fibres.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim , Fazio Florian

Statut: En cours

Développement et caractérisation de blocs porteurs écologiques à base de terre excavée

Rôle: Requérant(e) principal(e)

Description du projet :

Le secteur de la construction et en particulier le secteur genevois de la construction doit relever deux défis majeurs étroitement liés: d’une part, l’approvisionnement en matières premières (notamment avec les réserves genevoises exploitables de graviers qui s’amenuisent) et d’autre part l’élimination des matériaux d’excavation (engorgement des sites de stockage).

Citons à titre d’exemple le territoire Genevois, où plus de 3.7 millions de tonnes de matériaux d’excavation non pollués sont produites chaque année sur les chantiers, ce qui représente plus des 2/3 de l’ensemble des déchets du canton (5 millions de tonnes). Afin de comprendre davantage les enjeux relatifs à ces volumes chiffrés de terres excavées, considérées légalement comme des déchets, il faut préciser que cela correspond mensuellement au volume de 3 tours RTS, 2 Notre-Dame de Paris, 80 piscines olympiques et 13'500 camions.

Cependant, à l’heure où la dynamique autour de l’économie circulaire est forte, où la problématique de la gestion des terres d’excavation est bien connue de tous les acteurs du secteur, on ne peut que constater que les conditions pour une large valorisation de ces matériaux ne sont pas réunies: seuls 15% de ces terres sont recyclés, essentiellement pour le remblayage sur site, le comblement de sites et également pour fabriquer des blocs de terre crue compressée destinés à la fabrication de murs non porteurs.

Parmi les facteurs expliquant ce faible taux de recyclage (surtout en tant que matières premières pour la fabrication de matériaux de construction), on peut citer:

  • une mauvaise image et une peur des matériaux recyclés, considérés à tort comme moins fiables;
  • un manque d’information et une méconnaissance des matériaux recyclés.

Ce projet a pour objectif le développement de pratiques de construction alternatives et écologiques, via le développement et la caractérisation complète de bloc de terre compressée stabilisée (BTC) grand format pour des applications de murs porteurs intérieurs ou extérieurs, dans le but de:

  • certifier de leurs capacités portantes et valider ainsi les calculs prévisionnels des ingénieurs civils sur la structure du bâtiment;
  • améliorer l’image de ces matériaux et de rassurer les différents acteurs de la construction.

Plus précisément, le projet vise à :

  • caractériser un nouveau «produit» (matériau, système constructif) pour des éléments porteurs verticaux à base de blocs de terre compressée grand format, les «TERRAPADS»;
  • caractériser ce produit d’un point de vue de mise en œuvre, performance et durabilité;
  • préciser le domaine d’application du produit et son intégration dans un projet de construction;
  • contribuer à combler le manque d’informations afin de répondre aux interrogations des différents acteurs de la construction (ingénieurs, architectes, maçons, maitre d’ouvrage et utilisateur).

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim , Fazio Florian

Partenaires professionnels: Terrabloc

Statut: En cours

Béton de Terre

Rôle: Requérant(e) principal(e)

Description du projet :

L’objectif de ce projet est de revaloriser des terres d’excavation en élaborant une formulation de béton de terre afin d’obtenir un matériau permettant une mise en œuvre aisée et atteignant une résistance à la compression suffisante. L'idée est de proposer une voie durable et économiquement viable pour valoriser ces «déchets», en les considérant comme de précieuses ressources, réutilisées directement sur le chantier source ou à proximité.

Contrairement au béton classique, ce «nouveau» système de construction pour des éléments porteurs à base de «béton de terre» contient beaucoup moins de ciment et est constitué à plus de 70% de déblais d’excavation terreux recyclés localement. Il peut être mis en œuvre de manière conventionnelle i.e. par coulage dans des coffrages, ce qui fait de ce produit une alternative potentielle performante tant au niveau écologique qu’économique.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim , Fazio Florian

Partenaires professionnels: Terrabloc

Statut: En cours

Terminés

Recherche sur le vieillissement accéléré de béton coloré

Rôle: Requérant(e) principal(e)

Description du projet :

La durabilité des matériaux et structures fait intervenir un certain nombre de phénomènes complexes. Elle va dépendre des caractéristiques des matériaux, des applications prévues, et des conditions environnementales. Pour prévoir le comportement à long terme d’éléments de structure et observer les éventuelles dégradations dans un délai relativement court, il est nécessaire de réaliser des essais de vieillissements accélérés en laboratoire. L’objet de ce travail est d’étudier un certain nombre de paramètres (formulation, ajout de produits hydrofuges, …) influençant le vieillissement d'éléments de façade en béton coloré exposé notamment aux UV et au gel/dégel.

Equipe de recherche au sein de la HES-SO: Bennani Abdelkrim

Durée du projet: - 01.12.2020

Statut: Terminé

2025

Fire Performances of SFRC-Insulated Panels and Slabs for Modular Construction: An Experimental Study
Article scientifique ArODES

Sannem Ahmed Salim Landry Sawadogo, Tan-Trung Bui, Abdelkrim Bennani, David Damichey, Ali Limam

Fire,  2025, 8, 12, 458

Lien vers la publication

Résumé:

Fire safety is a crucial issue for buildings, especially with the rise of modular construction, which demands materials that combine lightness with mechanical performance and stability. This study investigates a new concept for single-story modular constructions, made up of 3D cells assembled from thermally and acoustically pre-insulated concrete panels. These panels comprising four walls and two slabs forming the module, are stiffened, with thicknesses of only 5 cm for the walls and 7 cm for the slabs. Their constituent material is a self-compacting, high-volume steel-fiber concrete, containing 80 kg/m3 of steel fibers and 0.3 kg/m3 of polypropylene fibers. Experimental tests on a full-scale wall and slab revealed that adding 0.3 kg/m3 of polypropylene fibers effectively prevents concrete from splintering and achieves the necessary 30 min fire resistance. Standardized full-scale fire tests on walls and slabs confirmed that these thin structures meet fire resistance, insulation, and airtightness standards. The high volume of steel fibers provides ductility, maintaining structural integrity despite concrete spalling. The maximum spalling depth observed in some areas ranged 35 to 50 mm, without compromising structural performance. Overall, the modular system satisfies the fire safety requirements for structural stability (no collapse) and performance in single-story modular construction.

Laterite-based low-carbon binder supporting the circular economy in Yaoundé, Cameroon
Article scientifique ArODES

Louise Mazzoni Leduc, Bernadin Kenne Diffo, Jean Ambroise, Abdelkrim Bennani

Buildings,  2025, 15, 17, 3154

Lien vers la publication

Résumé:

This study formulates an efficient, affordable, and low-carbon binder based on locally excavated earth from Yaoundé, offering sufficient mechanical strength and water resistance for rendering applications. Through material characterization, a binary binder composed of Portland cement (PC) and calcined laterite (CL) was developed, reducing the PC content by up to 30%. The mortar used laterite sand with varying fine particle contents in place of river sand, and its mechanical strength and water absorption via capillarity action were evaluated. Due to the porosity of the laterite fines, all mixes were prepared at equivalent workability. The mechanical strength was the same as if the binder solely consisted of PC and reached 11 MPa when the laterite sand contained no fine particles. As the fine particle content increased, the mechanical strength decreased to a minimum value of 4 MPa when raw laterite was used, and the coefficient of water absorption via capillarity action decreased. Overall, the formulated class Wc2 mortar is suitable for rendering applications. The valorization potential of fine particles and coarse aggregates of the crushed mortar was assessed: the crushed mortar fines had pozzolanic properties and could serve as supplementary cementitious materials; the largest particles are suitable for lime stabilization.

3D modular construction made of precast SFRC-stiffened panels
Article scientifique ArODES

Sannem Ahmed Salim Landry Sawadogo, Tan-Trung Bui, Abdelkrim Bennani, Dhafar Al Galib, Pascal Reynaud, Ali Limam

Infrastructures,  2025, 10, 7, 176

Lien vers la publication

Résumé:

A new concept of a 3D volumetric module, made up of six plane stiffened self-compacting fiber-reinforced concrete (SFRC) panels, is here studied. Experimental campaigns are carried out on SFRC material and on the thin-slab structures used for this modular concept. The high volume of steel fibers (80 kg/m3) used in the formulation of this concrete allow a positive strain hardening to be obtained in the post-cracking regime observed on the bending characterization tests. The high mechanical material characteristics, obtained both in tension and compression, allow a significant decrease in the module slabs’ thickness. The tests carried out on the 7 cm thick slab demonstrate a high load-bearing capacity and ductility under bending loading; this is also the case for shear loading configuration, although without any shear reinforcements. Numerical simulations of the material mechanical tests were conducted using Abaqus code; the results corroborate the experimental findings. Then, simulations were also conducted at the structural level, mainly to evaluate the behavior and the bearing capacity of the thin 3D module stiffened slabs. Finally, knowing that the concrete module truck transport can be a weak point, the decelerations induced during transportation were characterized and the integrity of the largest 3D module was demonstrated.

2022

Experimental and numerical study on static and dynamic axial crushing of square aluminum tubes :
Article scientifique ArODES
effects of cutouts

Tan-Trung Bui, Dhafar Al Galib, Abdelkrim Bennani, Ali Limam

International Journal of Protective Structures,  2022, 13, 2, 403-438

Lien vers la publication

Résumé:

The collapse of tubes under axial load is an important subject from the safety point of view, particularly in the design of energy absorbing devices used in many engineering applications. In this study, quasi-static and dynamic experiments were carried out on square thin-walled aluminum extrusions to investigate the effects of circular holes. Cutouts were introduced in the four corners of the square-section tube, not far from the end boundary of the tube, in order both to decrease the first peak load on the load-displacement characteristic and to control the collapse mode. Different aspects, such as the buckling modes and the energy absorption in quasi-static axial crushing tests, as well as dynamic effects and material rheology contributions in dynamic crushing tests, have been examined. For the dynamic tests, the parameters were the impacting mass and its velocity. The results showed a drop in the first peak function of the openings’ radius and the tube’s energy absorption capacity was kept. A comparison between static and dynamic tests results was carried out and the interpretation of the results in terms of deformation mechanism and energy absorption was discussed. Numerical simulations with the finite element code ABAQUS were conducted to confirm the experimental findings. The results of different numerical models, implicit and explicit calculations, that contribute to a basic understanding of the buckling and prediction of the crash behavior of the aluminum components without and with the cutouts are presented.

2021

Behaviour of macro-synthetic fibers reinforced concrete :
Article scientifique ArODES
experimental, numerical and design code investigations

W. S. A. Nana, H. V. Tran, T. Goubin, G. Kubisztal, Abdelkrim Bennani, T. T. Bui, G. Cardia, A. Limam

Structures,  2021, vol. 32, pp. 1271-1286

Lien vers la publication

Résumé:

Fiber-reinforced concrete (FRC) is increasingly used in various civil engineering applications. Compared to conventional reinforced concrete (rebars or welded mesh), the FRC has very high ductility in the post-cracking phase and allows more distributed cracks with a smaller opening. The FRC post-cracking behaviour depends on the fiber type (properties of fibers) used and the fiber content. Therefore, the characterization of fiber-reinforced concrete material behaviour under tension is important. In this study, the post-peak behaviour of the FRC using polypropylene macro-synthetic fiber (SikaFiber Force-60 brand) was characterized. According to the European test recommendation (EN 14651, 2005), notched 3‐point bending tests were conducted on 36 prismatic notched beams (dimensions of 600 mm × 150 mm × 150 mm) to identify the stress/crack opening law of FRC. The influence of the fiber dosage was evaluated with six fiber volume fractions of 0.33%, 0.49%, 0.66%, 0.82%, 0.99% and 1.26% corresponding to dosages of 3.0 kg/m3, 4.5 kg/m3, 6.0 kg/m3, 7.5 kg/m3, 9.0 kg/m3 and 11.5 kg/m3 respectively. It was found that the increase of the fiber dosage has no significant influence on the ultimate bending strength, but a substantial increase in the residual tensile flexural stresses was found. A numerical model using the inverse method was also used to reproduce the stress/crack opening behaviour of FRC obtained in the experimental tests. A new approach was proposed to define the post-cracking diagram adapted for the macro-synthetic FRC used. Fib Model Code 2020 approach was also conducted and compared with. The Model Code requirements for FRC’s use in structural applications have also been adapted to the case of macro-synthetic FRC following Hillerborg's concept of fracture energy and a new proposal was made.

2020

Shear performance of steel fiber reinforced concrete beams without stirrups :
Article scientifique ArODES
experimental investigation

T. T. Bui, W. S. A. Nana, B. Doucet-Ferru, Abdelkrim Bennani, H. Lequay, A. Limam

International Journal of Civil Engineering,  2020, vol. 18, pp. 865-881

Lien vers la publication

Résumé:

Over the past century, a considerable amount of research has been conducted to study the brittle behavior of traditional concrete. Currently, fiber reinforcement material appears as an effective way to enhance general concrete performance under diverse loads. In the present study, an experimental investigation of the steel fibers’ effect on the bending behavior of concrete beams is performed. The main objectives were first to see whether the use of steel fibers allows the total substitution of traditional transverse reinforcement (stirrups) and second to examine the effect of a combination of steel fibers and longitudinal rebars. The experimental program includes four beam specimens of dimensions 1700 mm × 80 mm × 150 mm. The results show that the fiber volume fraction of 100 kg/m3 of uncoated steel fibers, which corresponds to 1.27% fiber volume fraction, can be used to replace the transverse reinforcement. Besides, the obtained results show that the combination of the steel fibers with longitudinal reinforcement is necessary to obtain a better resistance under bending.

Nonlinear finite element analysis of inflatable beams made from orthotropic woven fabric
Article scientifique
Apedo, K.L.; Ronel, S.; Jacquelin, E.; Bennani, A.; Massenzio, M.

Bennani Abdelkrim

International Journal of Solids and Structures, 2020 , vol.  47, no  16, pp.  2017-2033

Lien vers la publication

Résumé:

This paper was devoted to the three-dimensional nonlinear finite element analysis of inflatable beams. The beams under consideration are made of modern textile materials and can be used as a load-bearing beams or arches when inflated. A 3D Timoshenko beam with a homogeneous orthotropic woven fabric (OWF) was proposed. The model took into account the geometric nonlinearities and the follower force resulting from the inflation pressure. The use was made of the usual total Lagrangian form of the virtual work principle to perform the nonlinear equilibrium equations which were discretized by the finite element method. Two kinds of solutions were then investigated: finite elements solutions for linearized problems which were obtained by the means of the linearization around the prestressed reference configuration of the nonlinear equations and nonlinear finite element solutions which were performed by the use of an optimization algorithm based on the Quasi-Newton method. As an example, the bending problem of a cantilever inflated beam under concentrated load was considered and the deflection results improve the existing theoretical models. As these beams are made from fabric, the beam models were validated through their comparison with a 3D thin-shell finite element model. The influence of the material effective properties and the inflation pressure on the beam response was also investigated through a parametric study. The finite elements solutions for linearized problems were found to be close to the theoretical results existing in the literature. On the other hand, the results for the nonlinear finite element model were shown to be close to the results for the linearized finite elements model in the case of high mechanical properties and the nonlinear finite element model was used to improve the linearized model when the mechanical properties of the fabric are low.
 

2018

Buckling behavior of metallic cylindrical shell structures strengthened with CFRP composite
Article scientifique ArODES

Z. Draidi, Tan Trung Bui, Ali Limam, Huu Viet Tran, Abdelkrim Bennani

Advances in Civil Engineering,  2018, article no. 4231631

Lien vers la publication

Résumé:

The objective of this study is to evaluate the effect of a CFRP composite layer on the buckling behavior of metallic cylindrical shells. To enhance the bearing capacity of steel shells, classical solutions consider internal or external metallic stiffeners (stringers and/or rings) welded or riveted to the shell. Here, an external skin of composite material which wraps the whole metallic skin of the shell is studied. To be valid for metallic shells structures (storage tanks like silos) as well as for metal pipes (gas or oil pipeline), the procedure for setting up and implementing the composite must be simple. The recommended solution is therefore tested through experimental tests to find their limits and the configuration of optimal behavior. A consistent enhancement of bearing capacity is observed. This experimental base serves also to consolidate a numerical model which corroborates the experimental results. The good correlation between experimental and numerical results is confirmed for the whole loading process, for unstiffened and stiffened shells. For metallic unstiffened shell, an adequacy between experiment and simulation is noticed in the mainly membrane precritical behavior, during the buckling initiation characterized by the boundary layer problem corresponding to axisymmetric wavelength appearance near boundaries and in the postcritical domain associated to localization of the buckling mode at one extremity of the shell. For stiffened configuration, the enhancement of the bearing capacity of the shell is correctly gauged; this confirms the possibility to use finite element simulation for the design.

2012

Structural monitoring: Identification and location of an impact on a structurally dissipating rock-shed structure using the inverse method
Article scientifique
Boukria, Z.; Perrotin, P.; Bennani, A.; Dupray, F.; Limam, A.

Bennani Abdelkrim

European Journal of Environmental and Civil Engineering, 2012 , vol.  16, no  1, pp.  20-42

Lien vers la publication

Experimental impact characterization on a Structurally Dissipating Rock-shed (SDR) structure
Article scientifique
Boukria, Z.; Perrotin, P.; Bennani, A.; Limam, A.

Bennani Abdelkrim

International Journal of Protective Structures, 2012 , vol.  3, no  1, pp.  21-36

Lien vers la publication

2011

Experimental impact force location and identification using inverse problems: Application for a circular plate
Article scientifique
Boukria, Z.; Perrotin, P.; Bennani, A.

Bennani Abdelkrim

International Journal of Mechanics, 2011 , vol.  5, no  1, pp.  48-55

Lien vers la publication

2010

Structural damping of model sandwich structures using tailored shear thickening fluid compositions
Article scientifique
Fischer, C.; Bennani, A.; Michaud, V.; Jacquelin, E.; Månson, J.-A.E.

Bennani Abdelkrim

Smart Materials and Structures, 2010 , vol.  19, no  3

Lien vers la publication

Résumé:

Shear thickening fluids (STF) demonstrate the ability to simultaneously stiffen and increase their damping capacity above a critical shear strain, which depends on the particle concentration and aspect ratio in the STF. The present work considers two types of STF differing by their particle size distribution: one is monodisperse and the other one is based on aggregates. The focus is on the ability to model and predict the behaviour of sandwich structures containing these fluids at confined interfaces. The rheological properties of the STF are first measured as a function of strain and frequency. Damping characteristics of model sandwich beams are then measured, and a finite element model using Timoschenko beams is proposed to predict the flexural compliance of the beams as a function of frequency. The model uses the strain-and frequency-dependent values of elastic and storage shear moduli of the suspensions. Good agreement is obtained, indicating that this approach could possibly be used as an inverse method to determine the rheological properties of STF beyond the range of the usual rheometers.

2009

Theoretical analysis of inflatable beams made from orthotropic fabric
Article scientifique
K.L. Apedo, S. Ronel, E. Jacquelin, M. Massenzio, A. Bennani,

Bennani Abdelkrim

Thin-Walled Structures, 2009 , vol.  47, no  12, pp.  1507-1522

Lien vers la publication

Résumé:

A theoretical analysis of inflatable beam was performed. These circular cross-section beams are made from fabric of polyester fibers coated with PVC. Such fabric may be tailored to form an arch when inflated. In many analyses, the Saint Venant Kirchhoff hypothesis was used and the authors assumed that the beams are made from an isotropic fabric. In this paper, a 3D Timoshenko's beam with a homogeneous orthotropic fabric was proposed. The model took into account the geometric nonlinearities and the inflation pressure follower force effect. The analytical equilibrium equations were performed using the total Lagrangian form of the virtual work principle. As these equations were nonlinear, a linearization was performed at the prestressed reference configuration to obtain the equations devoted to linearized problems. As an example, the bending problem was investigated. Four cases of boundary conditions were treated and the deflection and rotation's results improved the existing models in the case of an isotropic fabric. The wrinkling load in every case was also presented.

2008

The anti-oscillator model parameters linked to the apparent mass frequency response function
Article scientifique
E. Jacquelin, J.-P. Lainé, A. Bennani, M. Massenzio,

Bennani Abdelkrim

Journal of Sound and Vibration, 2008 , vol.  312, no  4-5, pp.  630-643

Lien vers la publication

Résumé:

A finite element model of a structure provides a fine knowledge of the response but such a model may lead to a loss of a global comprehension of the structural behaviour. That is why the anti-oscillator model (AO model), that may be derived from a finite element model, was developed. The mass and stiffness matrices are required but they often can not be retrieved easily in the commercial softwares. This paper shows how to overcome this problem and finally how to avoid a numerical model of a structure to derive the AO characteristics. In fact, it is shown that the AO characteristics and the apparent mass frequency response function (FRF) are closely tied. Indeed, the AO mass are the residue of the partial fraction decomposition of this FRF, while AO frequencies are the poles. Consequently, the AO characteristics can easily be derived from an experiment which allow the determination of the apparent mass FRF.
 

2007

Study of a device for controlling the pulses of sled testing
Article scientifique
Massenzio, M., Maupas, A., Bennani, A., Ronel, S., Joffrin, P., & Jacquelin, E.

Bennani Abdelkrim

International Journal of Crashworthiness, 2007 , vol.  12, no  3, pp.  311-318

Lien vers la publication

Résumé:

Improving the effectiveness of restraint systems (seat belts, air bags,) requires the development of experimental means capable of testing different crash types. Sled testing offers the advantage of improving the test conditions and consequently the repeatability of the crash pulse. The paper focuses on the deceleration device and on how to control the deceleration of the sled. The deceleration device includes a fixed part composed of four cylinders maintaining a steel bar and a spur attached to the front part of the sled. The dissipation mechanism is due to the plastic deformation of the steel bar impacted by the spur. The mechanism is stationary, leading to a constant force on the spur and therefore leading to a constant deceleration of the sled. The paper includes an experimental study and presents an analytical and a numerical model (FE model) to predict the deceleration of the sled. Comparisons between experimental results and predicted results point out the reliability of the models.

Shear thickening fluids as a tunable damping element: experimental results and modeling
Article scientifique
Christian Fischer, Abdelkrim Bennani, Christopher J. G. Plummer, Véronique Michaud, Pierre-Etienne Bourban, Eric Jacquelin, Jan-Anders E. Månson

Bennani Abdelkrim

Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems, 2007

Lien vers la publication

Résumé:

Highly concentrated silica suspensions are well-known for their pronounced shear-thickening behavior beyond a certain shear rate or stress, at which a significant and simultaneous increase of the stiffness and damping properties are observed. In the present work, the integration of shear-thickening fluids (STFs) into composite structures has been investigated with the aim of tuning part stiffness and damping capacity under dynamic deformation. Results from oscillatory rheological measurements on an STF were correlated with results from vibrating beam tests (VBT) on model sandwich structures containing layers of the same STF sandwiched between polyvinyl chloride (PVC) beams. The effect of STF composition was investigated, and finite element analysis (FEA) was used to predict the dynamic behavior of the PVC-STF sandwich structure numerically.

A modelling of an impacted structure based on constraint modes
Article scientifique
E. Jacquelin, J.-P. Lainé, A. Bennani, M. Massenzio

Bennani Abdelkrim

Journal of Sound and Vibration, 2007 , vol.  301, no  3-5, pp.  789-802

Lien vers la publication

Résumé:

The modelling of impacted structures may have a high numerical cost. For low velocity impact problem, single degree-of-freedom models may be used efficiently. Nevertheless, sometimes, these models are not suitable to describe the dynamic behaviour of the structure. This paper presents a new model of impacted structures which may be viewed as an extension of the single degree-of-freedom existing models: it allows for the dynamic behaviour of a structure and the numerical cost is low. The fundamental elements of this model are single degree-of-freedom systems called “anti-oscillators”: the natural frequencies of these single degree-of-freedom systems correspond to the antiresonant frequencies of the structure. The applications given in this paper show that only a small number of anti-oscillators are required for accurate simulations of an impact event.
 

2006

Modelling approaches of the in-plane shear behaviour of unreinforced and FRP strengthened masonry panels
Article scientifique
A. Gabor, A. Bennani, E. Jacquelin, F. Lebon

Bennani Abdelkrim

Composite Structures, 2006 , vol.  74, no  3, pp.  277-288

Lien vers la publication

Résumé:

he paper presents different finite element modelling approaches, developed with a commercial software, for the analysis of the behaviour of unreinforced and FRP strengthened masonry walls when their are subjected to a predominant shear load. Three models are analyzed, having different complexity levels. These models are used for the simulation of diagonal compression tests on masonry panels. The numerical simulations are compared with experimental results and the reliability of the different finite element models is discussed.

2005

Analysis of a force reconstruction problem
Article scientifique
Jacquelin, E.; Bennani, A.; Massenzio, M.

Bennani Abdelkrim

Structural Engineering and Mechanics, 2005 , vol.  21, no  3, pp.  237-254

Lien vers la publication

Résumé:

This article deals with the reconstruction of an impact force. This requires to take measurements from the impacted structures and then to deconvolve those signals from the impulse response function. More precisely, the purpose of the work described here is to analyse the method of deconvolution and the problems that it implies. Thus, it is highlighted that the associated deconvolution problem depends on the location of the measurement points: it is possible or not to reconstruct the force of impact in function of the location of this point. Then, the role of the antiresonances is linked up with this problem. The singular value decomposition is used to understand these difficulties. Numerical predictions are compared and validated with experiments.

2003

Force reconstruction: analysis and regularization of a deconvolution problem
Article scientifique
E. Jacquelin, A. Bennani, P. Hamelin,

Bennani Abdelkrim

Journal of Sound and Vibration, 2003 , vol.  265, no  1, pp.  81-107

Lien vers la publication

Résumé:

The reconstruction of force is considered by means of indirect measurements. This necessitates taking measurements from the impacted structure and then to deconvolve those signals from the impulse response function. More precisely, the purpose of the work described here is to analyze a deconvolution technique and to solve the problems which occur. Thus, it is highlighted that the associated deconvolution problem depends on the location of the measurement points: is it possible or not to reconstruct the impact force versus the location of this point. Numerical predictions are compared and validated with experiment. But, the deconvolution is a well-known ill-posed problem: the results are often unstable. This is why it is necessary to regularize the problem, which consists of adding a condition to the solution which does not appear in the initial problem. Some regularization methods are presented. Nevertheless, they necessitate the determination of a parameter; the difficulty is to calculate an appropriate value of this regularization parameter. The methods are successfully used to recover an experimental force.

2024

Laterite based low carbon binders for circular economy in Yaounde Cameroon
Conférence
Leduc Louise; Kenne Diffo Bernadin; Abdelkrim Bennani,Tchakouté Kouamo H.; Ambroise Jean

Bennani Abdelkrim

FTAL Conference Circular Economy, 14.11.2024 - 15.11.2024, Lugano

Lien vers la conférence

Structural behavior of 3D printed load bearing elements
Conférence ArODES

Bilal A. Baz, W. Serge Auguste Nana, Loïc Regnault de la Mothe, Jérôme Florentin, Kouka Amed Jeremy Ouedraogo, Gianluca Cardia, Chikaeze Ugwu, Matthias Werzinger, Fabian Meyer-Brötz, Abdelkrim Bennani, Hélène Lombois-Burger

Digital Concrete 2024 - Supplementary Proceedings

Lien vers la conférence

Résumé:

3D Printing technology is rapidly reshaping the construction industry as an innovative and sustainable building solution. Printing elements with structural and load bearing functions, using concrete material is among the considered solutions. The present study aims to demonstrate the ability of using 3D printed elements as fully structural. A comprehensive experimental program has been implemented to demonstrate this structural capability for 3D Printed element as the technology is presently outside construction codes. The program compares, in the same production and curing conditions, the mechanical behavior of cast in molds material, 3D printed material, and the associated l performance of structural elements at real scale. The material used was a one-component (1k) ink. Reliable correlations between material scales and large-scale elements can be established. However, a larger design safety margin than stated in the codes for conventionally cast concrete needs to be considered presently.

Concrete volumetric building units for highly environmental-efficient modular houses
Conférence ArODES

S. A. S. L. Sawadago, T. T. Bui, A. Limam, Abdelkrim Bennani, H. David, D. Damichey

Proceedings of the 7th International Conference on Geotechnics, Civil Engineering and Structures, CIGOS 2024, 4-5 April 2024, Ho Chi Minh City, Vietnam

Lien vers la conférence

Résumé:

Volumetric building units can be very attractive due to several benefits in comparison with traditional construction, mainly, a reduced building time and reducing associated costs, material waste reduction, safer working environment, and improved quality. In our study, several concrete prototypes modules or Prefabricated Finished Volumetric Concrete Construction (PFVCC) was fabricated, then modular houses based on this concept were built. This allows to characterize all the construction process of the PFVCC, and to gauge its mechanical efficiency, including during their transportation. This new concept of concrete modular houses fulfils the actual requirements of modern construction as optimal insulation, acoustic performance, environmental aspects and modern architecture.

2015

Punching shear strengthening of flat slabs: CFRP and shear reinforcement
Conférence
Moreno, C.; Ferreira, D.; Bennani, A.; Sarmento, A.; Noverraz, M.

Bennani Abdelkrim,

Concrete - Innovation and Design: fib Symposium Proceedings, 18.05.2015 - 20.05.2015, Copenhague

Lien vers la conférence

Réalisations

Médias et communication
Nous contacter
Suivez la HES-SO
linkedin instagram facebook twitter youtube rss
univ-unita.eu www.eua.be swissuniversities.ch
Mentions légales
© 2021 - HES-SO.

HES-SO Rectorat