6 results on '"Fazia, Fouchal"'
Search Results
2. Efficient masonry vault inspection by Monte Carlo simulations: Case of hidden defect
- Author
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Abdelmounaim Zanaz, Sylvie Yotte, Alaa Chateauneuf, and Fazia Fouchal
- Subjects
Engineering ,business.industry ,Inspection ,Computation ,Monte Carlo method ,0211 other engineering and technologies ,Probabilistic logic ,020101 civil engineering ,02 engineering and technology ,Building and Construction ,Structural engineering ,Masonry ,Coring ,0201 civil engineering ,Reliability engineering ,Nondestructive testing ,021105 building & construction ,Single-core ,Defect ,Bearing capacity ,Bridge ,business ,Probability ,Civil and Structural Engineering - Abstract
This paper presents a methodology for probabilistic assessment of masonry vaults bearing capacity with the consideration of existing defects. A comprehensive methodology and software package have been developed and adapted to inspection requirements. First, the mechanical analysis model is explained and validated by showing a good compromise between computation time and accuracy. This compromise is required when probabilistic approach is considered, as it requires a large number of mechanical analysis runs. To model the defect, an inspection case is simulated by considering a segmental vault. As the inspection data is often insufficient, the defect position and size are considered to be unknown. As the NDT results could not provide useful and reliable information, it is therefore decided to take samples with the obligation to minimize as much as possible their number. In this case the main difficulty is to know on which segment the coring would be mostly efficient. To find out, all possible positions are studied with the consideration of one single core. Using probabilistic approaches, the distribution function of the critical load has been determined for each segment. The results allow to identify the best segment for vault inspection.
- Published
- 2016
- Full Text
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3. Spreading of transverse compressive stresses in glued laminated timber
- Author
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Octavian Pop, Jean-François Bocquet, Fazia Fouchal, Frédéric Dubois, Damien Lathuilliere, Laurent Bleron, Laboratoire d'Etude et de Recherche sur le Matériau Bois (LERMAB), Université de Lorraine (UL), Groupe d'Etudes des Matériaux Hétérogènes (GEMH), Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), and Université de Limoges (UNILIM)-Université de Limoges (UNILIM)
- Subjects
Digital image correlation ,Materials science ,business.industry ,Forestry ,Structural engineering ,Transverse plane ,[SPI]Engineering Sciences [physics] ,Compressive strength ,Shear (geology) ,Glued laminated timber ,Perpendicular ,General Materials Science ,Composite material ,business ,Scale effect - Abstract
International audience; This paper presents a new approach for understanding localized compressive behavior perpendicular to the grain based on beams subjected to three-point bending. It was intended to take into account the coupling between compressive stresses perpendicular to the grain due to support reactions and shear stresses. To validate this, model, results of compression tests have been examined. The digital image correlation (DIC) method has been applied in order to analyze the deformation fields in support areas. The tests allow confirming the presence of spreading effect in the vicinity of support areas according to the DIC method. An analytical formulation has therefore been proposed to quantify distribution versus increasing compressive strength perpendicular to the grain, including shear effects. A scale effect and support conditions have also been highlighted using three different geometries and two types of tests.
- Published
- 2015
4. Study of the Effect of Siliceous Species in the Formation of a Geopolymer Binder: Understanding the Reaction Mechanisms among the Binder, Wood, and Earth Brick
- Author
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Sylvie Rossignol, Fabrice Gouny, Fazia Fouchal, Pascal Maillard, Groupe d'Etudes des Matériaux Hétérogènes (GEMH), Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Axe 3 : organisation structurale multiéchelle des matériaux (SPCTS-AXE3), Science des Procédés Céramiques et de Traitements de Surface (SPCTS), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Nationale Supérieure de Céramique Industrielle (ENSCI)-Institut des Procédés Appliqués aux Matériaux (IPAM), Centre Technique de Matériaux Naturels de Construction (CTMNC), and CTMNC
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Reaction mechanism ,Brick ,Materials science ,Structural material ,General Chemical Engineering ,[CHIM.MATE]Chemical Sciences/Material chemistry ,General Chemistry ,Industrial and Manufacturing Engineering ,[SPI.MAT]Engineering Sciences [physics]/Materials ,Geopolymer ,[SPI]Engineering Sciences [physics] ,Chemical engineering ,Magic angle spinning ,Hardening (metallurgy) ,Mortar ,Fourier transform infrared spectroscopy - Abstract
International audience; In building construction, geopolymer binder or mortar can interact with the structural materials and thus modify the binder formation mechanisms. In a geopolymer binder, the availability and amount of siliceous species is a preponderant parameter influencing the nature of networks formed after consolidation. In this study, the interactions between the binder and structural materials (wood and earth bricks) were investigated by 29Si magic angle spinning nuclear magnetic resonance (MAS NMR) and Fourier transform infrared spectroscopy (FTIR) during and after the consolidation. Then, the effect of the amount and nature of the siliceous species available in the reaction medium were analyzed. According to the siliceous species available, it is possible to form different types of materials (hardening or sedimented materials). By corroborating these results with MAS NMR and FTIR analyses, a formation scheme of the binder in contact with the materials was proposed.
- Published
- 2014
5. An Interface Model Including Cracks and Roughness Applied to Masonry
- Author
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Maria Letizia Raffa, Fazia Fouchal, Giuseppe Vairo, Frédéric Lebonb, Groupe d'Etudes des Matériaux Hétérogènes (GEMH), Université de Limoges (UNILIM)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM), Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Università degli Studi di Roma Tor Vergata [Roma], and MLR work was supported by Bando Vinci 2013 (n. C2-73) of Università Italo-Francese(UIF).
- Subjects
Engineering ,soft interface ,business.industry ,Interface model ,Numerical analysis ,Asymptotic analysis ,Experimental data ,micro-cracks ,Surface finish ,Structural engineering ,Masonry ,[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph] ,Homogenization (chemistry) ,Finite element method ,masonry structures micro-cracks ,[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] ,Interface modeling ,asymptotic analysis ,masonry structures ,Settore ICAR/08 - Scienza delle Costruzioni ,[SPI.GCIV.STRUCT]Engineering Sciences [physics]/Civil Engineering/Structures ,business ,Civil and Structural Engineering ,Parametric statistics ,roughness - Abstract
International audience; In this paper an interface model accounting for roughness and micro-cracks is presented and applied to masonry-like structures. The model is consistently derived by coupling a homogenization approach and arguments of asymptotic analyses. A numerical procedure is introduced and numerical results, based on a finite element formulation, are successfully compared with experimental data , obtained on masonry samples undergoing to shear tests. Finally, a parametric numerical analysis is proposed, highlighting the influence of the roughness features on the interface response.
- Published
- 2014
6. Contribution to the modelling of interfaces in masonry construction
- Author
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Isabelle Titeux, Fazia Fouchal, Frédéric Lebon, Laboratoire de Mécanique et d'Acoustique [Marseille] (LMA ), Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU)-École Centrale de Marseille (ECM), Université de Reims Champagne-Ardenne (URCA), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), F. Darve, I. Doghri, R. El Fatmi, H. Hassis, and H. Zenzri
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Materials science ,Cracks ,Diagonal ,Interfaces ,0211 other engineering and technologies ,02 engineering and technology ,[SPI.MECA.SOLID]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Solid mechanics [physics.class-ph] ,Modelling ,[PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Structural mechanics [physics.class-ph] ,0203 mechanical engineering ,021105 building & construction ,[PHYS.MECA.SOLID]Physics [physics]/Mechanics [physics]/Solid mechanics [physics.class-ph] ,General Materials Science ,Masonry ,Civil and Structural Engineering ,business.industry ,Building and Construction ,Structural engineering ,Compression (physics) ,[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of the structures [physics.class-ph] ,020303 mechanical engineering & transports ,Damage ,[SPI.MECA.STRU]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Structural mechanics [physics.class-ph] ,[PHYS.MECA.STRU]Physics [physics]/Mechanics [physics]/Mechanics of the structures [physics.class-ph] ,Mortar ,business ,Intensity (heat transfer) - Abstract
International audience; The aim of this study was to model the mechanical behavior of interfaces in masonry structures. In the first part, the characteristics of the materials and interfaces involved are determined experimentally. In the second part, a model based on the adhesion intensity is developed. This model can be used to describe the interfaces between mortar and full or hollow bricks and to describe the damage occurring in the mortar. The mechanical behavior predicted by this model is compared with previously obtained experimental data. The model is then tested in the case of some classical masonry structures (small walls, diagonal compression tests).
- Published
- 2009
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