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Ajouter le résultat dans votre panierEtude expérimentale du comportement des tubes en acier remplis de béton / B. Kebaili in European journal of environmental and civil engineering, Vol. 16 N° 7 (Juillet 2012)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 765-776
Titre : Etude expérimentale du comportement des tubes en acier remplis de béton Type de document : texte imprimé Auteurs : B. Kebaili, Auteur ; B. Redjel, Auteur Année de publication : 2012 Article en page(s) : pp. 765-776 Note générale : Génie Civil Langues : Français (fre) Mots-clés : Tubes Acier Béton Rempli Confinement Axiale Résumé : Une étude sur 27 essais de tube en acier remplis de béton a été effectuée. Les paramètres, résistance du béton, rapport diamètre sur épaisseur du tube et nuance d’acier sont traités. La relation charge déformation et la variation du volume dV/V ont montré qu’à partir de 70% de la charge ultime, la déformation du composite se fait à volume croissant ce qui indique un changement de la structure du béton par la propagation de la microfissuration. Son coefficient de Poisson devient supérieur à 0,5 créant ainsi un état de confinement du noyau de béton. A la limite de ruine la déformation transversale dans le tube d’acier devient égale à celle longitudinale. Selon le critère de Von-Mises ceci ne peut être négligé dans le calcul de la résistance du composite ; l’EC4 donne une meilleure approche que l’ACI-318 qui néglige cet effet. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.667657 [article] Etude expérimentale du comportement des tubes en acier remplis de béton [texte imprimé] / B. Kebaili, Auteur ; B. Redjel, Auteur . - 2012 . - pp. 765-776.
Génie Civil
Langues : Français (fre)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 765-776
Mots-clés : Tubes Acier Béton Rempli Confinement Axiale Résumé : Une étude sur 27 essais de tube en acier remplis de béton a été effectuée. Les paramètres, résistance du béton, rapport diamètre sur épaisseur du tube et nuance d’acier sont traités. La relation charge déformation et la variation du volume dV/V ont montré qu’à partir de 70% de la charge ultime, la déformation du composite se fait à volume croissant ce qui indique un changement de la structure du béton par la propagation de la microfissuration. Son coefficient de Poisson devient supérieur à 0,5 créant ainsi un état de confinement du noyau de béton. A la limite de ruine la déformation transversale dans le tube d’acier devient égale à celle longitudinale. Selon le critère de Von-Mises ceci ne peut être négligé dans le calcul de la résistance du composite ; l’EC4 donne une meilleure approche que l’ACI-318 qui néglige cet effet. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.667657
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 777-794
Titre : The characteristic state Type de document : texte imprimé Auteurs : Eric Vincens, Auteur ; Cécile Nouguier-Lehon, Auteur Année de publication : 2012 Article en page(s) : pp. 777-794 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : DEM Granular material Aspect ratio Cycles Biaxial test Anisotropy Résumé : Simulations of cyclic biaxial tests on samples composed of 2D irregular polygonal particles were performed to investigate the properties of the characteristic state, transition state between contraction and dilation. Two aspect ratios of 2D angular particules and different states of initial fabric are considered. The stress ratio at characteristic state is found to be much more sensitive to initial anisotropy than to density changes. Fabric is the kind of anisotropy that seems to influence the most the characteristic state. Constant amplitude cycling does not erase the influence of the initial anisotropy of fabric which was not expected. Then, in the framework of usual soil modelling where the material is supposed to be in an initially isotropic state, the usual models for the characteristic state are only valid for constant cyclic strain amplitude loadings where the mean anisotropy throughout the cycles remains low. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.671057 [article] The characteristic state [texte imprimé] / Eric Vincens, Auteur ; Cécile Nouguier-Lehon, Auteur . - 2012 . - pp. 777-794.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 777-794
Mots-clés : DEM Granular material Aspect ratio Cycles Biaxial test Anisotropy Résumé : Simulations of cyclic biaxial tests on samples composed of 2D irregular polygonal particles were performed to investigate the properties of the characteristic state, transition state between contraction and dilation. Two aspect ratios of 2D angular particules and different states of initial fabric are considered. The stress ratio at characteristic state is found to be much more sensitive to initial anisotropy than to density changes. Fabric is the kind of anisotropy that seems to influence the most the characteristic state. Constant amplitude cycling does not erase the influence of the initial anisotropy of fabric which was not expected. Then, in the framework of usual soil modelling where the material is supposed to be in an initially isotropic state, the usual models for the characteristic state are only valid for constant cyclic strain amplitude loadings where the mean anisotropy throughout the cycles remains low. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.671057
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 795-817
Titre : Probability-based assessment of dam safety using combined risk analysis and reliability methods – application to hazards studies Type de document : texte imprimé Auteurs : Laurent Peyras, Auteur ; Claudio Carvajal, Auteur ; Huguette Felix, Auteur Année de publication : 2012 Article en page(s) : pp. 795-817 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dam Reliability Risk analysis Security Hazards study Résumé : Dam safety assessment is a major challenge for engineers specialising in hydraulic works. It is now standardised in regulations providing for hazards studies using probability-based risk analysis procedures. Dam safety probability-based assessment includes two key scientific issues: the modelling of complex mechanisms that occur within the works, and a probability-based assessment of structural safety. This paper introduces a combined application of risk analysis and dam reliability methodologies. This combination required the completion of our work on the adaptation of risk analysis methods to dams, and on the probability-based modelling of strength and loading input data for a reliability-based analysis. These methodologies are then implemented as part of a hazards study on a roller-compacted-concrete gravity dam. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.672200 [article] Probability-based assessment of dam safety using combined risk analysis and reliability methods – application to hazards studies [texte imprimé] / Laurent Peyras, Auteur ; Claudio Carvajal, Auteur ; Huguette Felix, Auteur . - 2012 . - pp. 795-817.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 795-817
Mots-clés : Dam Reliability Risk analysis Security Hazards study Résumé : Dam safety assessment is a major challenge for engineers specialising in hydraulic works. It is now standardised in regulations providing for hazards studies using probability-based risk analysis procedures. Dam safety probability-based assessment includes two key scientific issues: the modelling of complex mechanisms that occur within the works, and a probability-based assessment of structural safety. This paper introduces a combined application of risk analysis and dam reliability methodologies. This combination required the completion of our work on the adaptation of risk analysis methods to dams, and on the probability-based modelling of strength and loading input data for a reliability-based analysis. These methodologies are then implemented as part of a hazards study on a roller-compacted-concrete gravity dam. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.672200
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 818-836
Titre : Monitoring size effect on crack opening in concrete by digital image correlation Type de document : texte imprimé Auteurs : S.Y. Alam, Auteur ; A. Loukili, Auteur ; F. Grondin, Auteur Année de publication : 2012 Article en page(s) : pp. 818-836 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete Cracking Digital image correlation Size effect Crack opening Crack length Résumé : Fracture in concrete structures is generally accompanied by progressive cracking. This process is very complex and can be identified by associated crack parameters such as crack openings and crack length. These parameters are the direct indicators of the local failure in the material microstructure and can completely describe the fracture process of the concrete structure. The purpose of this article is to monitor experimentally the crack openings in geometrically similar concrete beams with different sizes. An experimental approach is used to estimate the effective crack length from the crack opening profile. For this, the digital image correlation technique is applied on the specimen surface to capture crack propagation. Size effect on the crack propagation is also investigated. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.672211 [article] Monitoring size effect on crack opening in concrete by digital image correlation [texte imprimé] / S.Y. Alam, Auteur ; A. Loukili, Auteur ; F. Grondin, Auteur . - 2012 . - pp. 818-836.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 818-836
Mots-clés : Concrete Cracking Digital image correlation Size effect Crack opening Crack length Résumé : Fracture in concrete structures is generally accompanied by progressive cracking. This process is very complex and can be identified by associated crack parameters such as crack openings and crack length. These parameters are the direct indicators of the local failure in the material microstructure and can completely describe the fracture process of the concrete structure. The purpose of this article is to monitor experimentally the crack openings in geometrically similar concrete beams with different sizes. An experimental approach is used to estimate the effective crack length from the crack opening profile. For this, the digital image correlation technique is applied on the specimen surface to capture crack propagation. Size effect on the crack propagation is also investigated. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.672211
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 837-862
Titre : Pressure--impulse diagrams for RC and FRC circular plates under blast loads Type de document : texte imprimé Auteurs : Matteo Colombo, Auteur ; Paolo Martinelli, Auteur Année de publication : 2012 Article en page(s) : pp. 837-862 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Blast loadings Pressure–impulse diagrams Circular plates SDOF systems Résumé : In this work, simplified models for the dynamic analysis of traditional reinforced concrete (RC) and fibre-reinforced concrete (FRC) circular plates under blast loads are proposed. The cases of plates simply supported or resting on Winkler-type soil are studied. The two cases under study intend to provide a simplified tool for predicting the response respectively for specimens subjected to blast pressure wave inside shock-tube facilities and for slabs on ground under blast loads. The second case also represents the loading conditions inside a new shock-tube facility specifically intended for the investigation of underground tunnel lining subjected to blast loads. The aim of this work is the pressure--impulse diagrams derivations for circular plates with several material characteristics, radius/thickness ratio and Winkler’s constant. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.675149 [article] Pressure--impulse diagrams for RC and FRC circular plates under blast loads [texte imprimé] / Matteo Colombo, Auteur ; Paolo Martinelli, Auteur . - 2012 . - pp. 837-862.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 837-862
Mots-clés : Blast loadings Pressure–impulse diagrams Circular plates SDOF systems Résumé : In this work, simplified models for the dynamic analysis of traditional reinforced concrete (RC) and fibre-reinforced concrete (FRC) circular plates under blast loads are proposed. The cases of plates simply supported or resting on Winkler-type soil are studied. The two cases under study intend to provide a simplified tool for predicting the response respectively for specimens subjected to blast pressure wave inside shock-tube facilities and for slabs on ground under blast loads. The second case also represents the loading conditions inside a new shock-tube facility specifically intended for the investigation of underground tunnel lining subjected to blast loads. The aim of this work is the pressure--impulse diagrams derivations for circular plates with several material characteristics, radius/thickness ratio and Winkler’s constant. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.675149
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 863-881
Titre : Seismic response evaluation of bridges under differential ground motion : A comparison with the new Algerian provisions Type de document : texte imprimé Auteurs : Nassima Benmansour, Auteur ; Mustapha Djafour, Auteur ; Abdelmalek Bekkouche, Auteur Année de publication : 2012 Article en page(s) : pp. 863-881 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bridges Dynamic analysis Earthquakes Spatial variability RPOA Résumé : Seismic response of extended structures, such as bridges, must take into account spatial variability of earthquake ground motion (SVGM). Eurocode 8 (EC8) and the Algerian bridge seismic regulation code (Règles Parasismiques applicables au domaine des Ouvrages d’Art; RPOA) are among the rare bridge design codes that introduced simplified approaches for SVGM. This paper aims at evaluating the accuracy of the method proposed by the RPOA through comparison with more refined approaches and the EC8 provisions. Various bridges are considered and the results show that the RPOA’s simplified method does not give satisfactory results and clearly overestimates the seismic demand. The solution proposed in this paper is to modify some provisions, and the new approach gives results which are in better agreement with the other methods. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.681951 [article] Seismic response evaluation of bridges under differential ground motion : A comparison with the new Algerian provisions [texte imprimé] / Nassima Benmansour, Auteur ; Mustapha Djafour, Auteur ; Abdelmalek Bekkouche, Auteur . - 2012 . - pp. 863-881.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 863-881
Mots-clés : Bridges Dynamic analysis Earthquakes Spatial variability RPOA Résumé : Seismic response of extended structures, such as bridges, must take into account spatial variability of earthquake ground motion (SVGM). Eurocode 8 (EC8) and the Algerian bridge seismic regulation code (Règles Parasismiques applicables au domaine des Ouvrages d’Art; RPOA) are among the rare bridge design codes that introduced simplified approaches for SVGM. This paper aims at evaluating the accuracy of the method proposed by the RPOA through comparison with more refined approaches and the EC8 provisions. Various bridges are considered and the results show that the RPOA’s simplified method does not give satisfactory results and clearly overestimates the seismic demand. The solution proposed in this paper is to modify some provisions, and the new approach gives results which are in better agreement with the other methods. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.681951
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 882-902
Titre : Influence of grain size distribution and cement content on the strength and aging of treated sandy soils Type de document : texte imprimé Auteurs : Fabien Szymkiewicz, Auteur ; Antoine Guimond-Barrett, Auteur ; Alain Le Kouby, Auteur Année de publication : 2012 Article en page(s) : pp. 882-902 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Cement Unconfined compression tests Mechanical behaviour Sand Deep soil mixing Résumé : Deep mixing is a method commonly used for various applications ranging from ground improvement and confinement to foundations. With the growth of the use of deep mixing for foundations, it is important to better define the mechanical behaviour and ageing of the material, depending on the cement content and grain size distribution. This study aims to quantify the impact of these parameters as well as the percentage of fines on the mechanical behaviour of the mixed material. A number of unconfined compression tests were carried out. The results showed that it was possible to predict the strength of the mixed material after seven and 28 days of curing, depending on the cement content and the percentage of fines. Also, it was shown that a uniform sand treated with cement presents the same hardening trend for all cement contents. Conversely, a soil with a larger spread of grain size distribution will show different hardening processes, depending on the cement content. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.676362 [article] Influence of grain size distribution and cement content on the strength and aging of treated sandy soils [texte imprimé] / Fabien Szymkiewicz, Auteur ; Antoine Guimond-Barrett, Auteur ; Alain Le Kouby, Auteur . - 2012 . - pp. 882-902.
Génie Civil
Langues : Anglais (eng)
in European journal of environmental and civil engineering > Vol. 16 N° 7 (Juillet 2012) . - pp. 882-902
Mots-clés : Cement Unconfined compression tests Mechanical behaviour Sand Deep soil mixing Résumé : Deep mixing is a method commonly used for various applications ranging from ground improvement and confinement to foundations. With the growth of the use of deep mixing for foundations, it is important to better define the mechanical behaviour and ageing of the material, depending on the cement content and grain size distribution. This study aims to quantify the impact of these parameters as well as the percentage of fines on the mechanical behaviour of the mixed material. A number of unconfined compression tests were carried out. The results showed that it was possible to predict the strength of the mixed material after seven and 28 days of curing, depending on the cement content and the percentage of fines. Also, it was shown that a uniform sand treated with cement presents the same hardening trend for all cement contents. Conversely, a soil with a larger spread of grain size distribution will show different hardening processes, depending on the cement content. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.676362
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