Dépouillements

Experiments and micromechanical modelling of elastic parameters of a composite geomaterial / Jolanta Lewandowska in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 121-140 Titre : Experiments and micromechanical modelling of elastic parameters of a composite geomaterial Type de document : texte imprimé Auteurs : Jolanta Lewandowska, Auteur ; Maciej Pilawski, Auteur Année de publication : 2012 Article en page(s) : pp. 121-140 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Homogenisation  Rigidity  tensor  Triaxial  tests  Geomaterials  Numerical  computations  Anisotropy Résumé : The aim of this paper is to study the elastic behaviour of a periodic composite geomaterial by applying a micromechanical approach. The macroscopic anisotropic rigidity tensor is computed using the asymptotic expansion homogenisation method. The results are partially validated through the triaxial testing of a composite in which the spheres made of sintered clay are periodically embedded in a matrix (Hostun sand HN38). Good agreement was observed between calculated and measured elastic parameters. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667694 [article] Experiments and micromechanical modelling of elastic parameters of a composite geomaterial [texte imprimé] / Jolanta Lewandowska, Auteur ; Maciej Pilawski, Auteur . - 2012 . - pp. 121-140. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 121-140 Mots-clés : Homogenisation  Rigidity  tensor  Triaxial  tests  Geomaterials  Numerical  computations  Anisotropy Résumé : The aim of this paper is to study the elastic behaviour of a periodic composite geomaterial by applying a micromechanical approach. The macroscopic anisotropic rigidity tensor is computed using the asymptotic expansion homogenisation method. The results are partially validated through the triaxial testing of a composite in which the spheres made of sintered clay are periodically embedded in a matrix (Hostun sand HN38). Good agreement was observed between calculated and measured elastic parameters. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667694

Assessment of kinematic GPS in updating road databases / H. Nechniche in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 141-156 Titre : Assessment of kinematic GPS in updating road databases Type de document : texte imprimé Auteurs : H. Nechniche, Auteur ; N. Brahmia, Auteur ; Kaddour Brahimi, Auteur Année de publication : 2012 Article en page(s) : pp. 141-156 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Kinematic  GPS  Road  network  Road  database  (RDB)  Road  information  system  (RIS) Résumé : For a road management policy to correctly handle road maintenance and optimisation as well as road network development issues, it needs to rely on a continuously and correctly updated road system database. Urban planners and road managers need accurate and updated data in order to deliver quality urban services and sound decision-making. However, in practice, updating the road database has significant risks of loss of information or inconsistency in the road data. Oran, the main city of the west of Algeria, has a road network which is in continual metamorphosis. Oran represents an adequate study site for evaluating the contribution of the Global Positioning System (GPS) and very high resolution satellite images to updating the road database (RDB) of the city. The approach developed in this paper aims at detecting the changes in the road network and integrating them automatically in a referenced RDB. We will evaluate the use of kinematic GPS in road data capture and integration in the RDB and will present innovative methods available in this field and the results they deliver. Findings deduced from this method and the potential for further innovation will also be described. In addition, an application integrating the updating mechanisms was designed in a geographical information system (GIS) environment, and validated with data extracted from the RDB; this application will be outlined in this paper. We will principally describe the effect of third dimension integration by GPS. This effect is very important for the enrichment of the RDB. This will allow a full settling up on our database and on the possible efficiency of the introduced elements into this base. For these reasons, we have developed a data integration technique, with examples of two important roads: the main road RN11 and the secondary road CW46. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.672191 [article] Assessment of kinematic GPS in updating road databases [texte imprimé] / H. Nechniche, Auteur ; N. Brahmia, Auteur ; Kaddour Brahimi, Auteur . - 2012 . - pp. 141-156. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 141-156 Mots-clés : Kinematic  GPS  Road  network  Road  database  (RDB)  Road  information  system  (RIS) Résumé : For a road management policy to correctly handle road maintenance and optimisation as well as road network development issues, it needs to rely on a continuously and correctly updated road system database. Urban planners and road managers need accurate and updated data in order to deliver quality urban services and sound decision-making. However, in practice, updating the road database has significant risks of loss of information or inconsistency in the road data. Oran, the main city of the west of Algeria, has a road network which is in continual metamorphosis. Oran represents an adequate study site for evaluating the contribution of the Global Positioning System (GPS) and very high resolution satellite images to updating the road database (RDB) of the city. The approach developed in this paper aims at detecting the changes in the road network and integrating them automatically in a referenced RDB. We will evaluate the use of kinematic GPS in road data capture and integration in the RDB and will present innovative methods available in this field and the results they deliver. Findings deduced from this method and the potential for further innovation will also be described. In addition, an application integrating the updating mechanisms was designed in a geographical information system (GIS) environment, and validated with data extracted from the RDB; this application will be outlined in this paper. We will principally describe the effect of third dimension integration by GPS. This effect is very important for the enrichment of the RDB. This will allow a full settling up on our database and on the possible efficiency of the introduced elements into this base. For these reasons, we have developed a data integration technique, with examples of two important roads: the main road RN11 and the secondary road CW46. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.672191

Relationships between concrete composition and boundary layer composition to optimise concrete pumpability / Tien-Tung Ngo in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 157-177 Titre : Relationships between concrete composition and boundary layer composition to optimise concrete pumpability Type de document : texte imprimé Auteurs : Tien-Tung Ngo, Auteur ; El Hadj Kadri, Auteur ; François Cussigh, Auteur Année de publication : 2012 Article en page(s) : pp. 157-177 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Pumpability  Tribometer  Interface  friction  Boundary  layer  Viscous  constant  Concrete Résumé : Concrete pumpability is determined by the friction at the interface between the concrete and the wall of the pumping pipes (which are generally made of steel); called the concrete–steel interface. This friction is related directly to the thickness and composition of the boundary layer (BL) that occurs during the movement of fresh concrete in a pipe. These BL characteristics are rigorously linked with concrete composition parameters. To highlight this complicated relationship, an apparatus called a ‘tribometer’ was used in two experimental programs. This apparatus allows measurement of the steel–concrete interface friction and deduction of interface parameters (also called the pumping parameters), namely viscous constant and interface yield stress. The first program focuses on the effect of the concrete composition on pumping parameters, and the second program focuses on the relationships between the concrete composition and the BL composition. The results of the first program show that increases in cement paste volume, water/cement ratio and super-plasticiser dosage enhance concrete pumpability. Increased content of fine sand in concrete induces negative effects on the interface frictions and on the pumpability. The results of the second program show that the BL is formed by water, cement and fine sand particles with a diameter lower than 0.25 mm. It also shows that the proportions of water and cement volume in BL and micro-concrete (concrete with the largest grain diameter lower than 0.25 mm) are almost the same. The relative enrichment produced by fine sand in the BL decreases with increasing proportion of fine sand volume in the concrete. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.666910 [article] Relationships between concrete composition and boundary layer composition to optimise concrete pumpability [texte imprimé] / Tien-Tung Ngo, Auteur ; El Hadj Kadri, Auteur ; François Cussigh, Auteur . - 2012 . - pp. 157-177. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 157-177 Mots-clés : Pumpability  Tribometer  Interface  friction  Boundary  layer  Viscous  constant  Concrete Résumé : Concrete pumpability is determined by the friction at the interface between the concrete and the wall of the pumping pipes (which are generally made of steel); called the concrete–steel interface. This friction is related directly to the thickness and composition of the boundary layer (BL) that occurs during the movement of fresh concrete in a pipe. These BL characteristics are rigorously linked with concrete composition parameters. To highlight this complicated relationship, an apparatus called a ‘tribometer’ was used in two experimental programs. This apparatus allows measurement of the steel–concrete interface friction and deduction of interface parameters (also called the pumping parameters), namely viscous constant and interface yield stress. The first program focuses on the effect of the concrete composition on pumping parameters, and the second program focuses on the relationships between the concrete composition and the BL composition. The results of the first program show that increases in cement paste volume, water/cement ratio and super-plasticiser dosage enhance concrete pumpability. Increased content of fine sand in concrete induces negative effects on the interface frictions and on the pumpability. The results of the second program show that the BL is formed by water, cement and fine sand particles with a diameter lower than 0.25 mm. It also shows that the proportions of water and cement volume in BL and micro-concrete (concrete with the largest grain diameter lower than 0.25 mm) are almost the same. The relative enrichment produced by fine sand in the BL decreases with increasing proportion of fine sand volume in the concrete. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.666910

Modal pushover procedures for seismic evaluation of reinforced concrete structures / Laila Tataie in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 178-203 Titre : Modal pushover procedures for seismic evaluation of reinforced concrete structures : Using new nonlinear single degree of freedom systems Type de document : texte imprimé Auteurs : Laila Tataie, Auteur ; Michael Brun, Auteur ; Jean-Marie Reynouard, Auteur Année de publication : 2012 Article en page(s) : pp. 178-203 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Pushover  procedure  Nonlinear  single  degree  of  freedom  system  Real-scale  reinforced  concrete  building  Nonlinear  time-history  seismic  response Résumé : This study performs a pushover procedure called Modified-UMRHA for seismic analysis of a reinforced concrete structure, based on the UMRHA (uncoupled modal response history analysis) procedure proposed by Chopra and Goel. The objective is to investigate three approaches for setting up nonlinear single degree of freedom systems drawn from modal pushover curves. These curves are obtained using a non-adaptive load pattern equal to the consistent mass matrix times the modal shape. These approaches are applied on the 14-storey Grenoble City Hall studied in the framework of the ARVISE French research program. The results obtained from the Modified-UMRHA using different proposed nonlinear single degree of freedom systems are compared with those from a rigorous nonlinear response history analysis. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667207 [article] Modal pushover procedures for seismic evaluation of reinforced concrete structures : Using new nonlinear single degree of freedom systems [texte imprimé] / Laila Tataie, Auteur ; Michael Brun, Auteur ; Jean-Marie Reynouard, Auteur . - 2012 . - pp. 178-203. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 178-203 Mots-clés : Pushover  procedure  Nonlinear  single  degree  of  freedom  system  Real-scale  reinforced  concrete  building  Nonlinear  time-history  seismic  response Résumé : This study performs a pushover procedure called Modified-UMRHA for seismic analysis of a reinforced concrete structure, based on the UMRHA (uncoupled modal response history analysis) procedure proposed by Chopra and Goel. The objective is to investigate three approaches for setting up nonlinear single degree of freedom systems drawn from modal pushover curves. These curves are obtained using a non-adaptive load pattern equal to the consistent mass matrix times the modal shape. These approaches are applied on the 14-storey Grenoble City Hall studied in the framework of the ARVISE French research program. The results obtained from the Modified-UMRHA using different proposed nonlinear single degree of freedom systems are compared with those from a rigorous nonlinear response history analysis. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667207

Numerical modelling of short pile behaviour subjected to lateral load / Erdal Uncuoğlu in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 204-235 Titre : Numerical modelling of short pile behaviour subjected to lateral load Type de document : texte imprimé Auteurs : Erdal Uncuoğlu, Auteur ; Mustafa Laman, Auteur Année de publication : 2012 Article en page(s) : pp. 204-235 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Lateral  loading  Short  pile  Cohesionless  soil  Finite  element  Lateral  effective  stress Résumé : The behaviour of laterally loaded short rigid piles founded in sandy soil has been investigated numerically by performing a series of three-dimensional non-linear finite element analyses. The parameters investigated are relative density and elasticity modulus of sandy soil, load eccentricity, pile geometry and geometric configurations such as pile cross-section, embedment ratio and pile diameter. The results of the existing design methods used for predicting the lateral load capacity of short rigid piles were compared with the results of the three-dimensional non-linear finite element analyses. The results proved that the parameters investigated had considerable effect on the behaviour of rigid piles subjected to lateral loads. It was also shown that the value of the ultimate lateral load capacity could be significantly different depending on the conventional methods used. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667697 [article] Numerical modelling of short pile behaviour subjected to lateral load [texte imprimé] / Erdal Uncuoğlu, Auteur ; Mustafa Laman, Auteur . - 2012 . - pp. 204-235. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 204-235 Mots-clés : Lateral  loading  Short  pile  Cohesionless  soil  Finite  element  Lateral  effective  stress Résumé : The behaviour of laterally loaded short rigid piles founded in sandy soil has been investigated numerically by performing a series of three-dimensional non-linear finite element analyses. The parameters investigated are relative density and elasticity modulus of sandy soil, load eccentricity, pile geometry and geometric configurations such as pile cross-section, embedment ratio and pile diameter. The results of the existing design methods used for predicting the lateral load capacity of short rigid piles were compared with the results of the three-dimensional non-linear finite element analyses. The results proved that the parameters investigated had considerable effect on the behaviour of rigid piles subjected to lateral loads. It was also shown that the value of the ultimate lateral load capacity could be significantly different depending on the conventional methods used. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667697

On the influence of aggregate nature on concrete behaviour at high temperature / Jean-Christophe Mindeguia in European journal of environmental and civil engineering, Vol. 16 N° 2 (Février 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 236-253 Titre : On the influence of aggregate nature on concrete behaviour at high temperature Type de document : texte imprimé Auteurs : Jean-Christophe Mindeguia, Auteur ; Pierre Pimienta, Auteur ; Hélène Carré, Auteur Année de publication : 2012 Article en page(s) : pp. 236-253 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Concrete  Aggregates  Spalling  Temperature  Pressures  Thermomecanical  stresses Résumé : This paper presents some experimental results on the behaviour of concrete at high temperature. The main objective is to analyse the influence of the type of aggregates on several material properties, and particularly upon the thermal instability risk (spalling) of the concrete. Different levels of observations have been chosen: from the study of small elements for the assessment of the main concrete properties at high temperature to the study of slabs to analyse the fire behaviour of the concretes. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667682 [article] On the influence of aggregate nature on concrete behaviour at high temperature [texte imprimé] / Jean-Christophe Mindeguia, Auteur ; Pierre Pimienta, Auteur ; Hélène Carré, Auteur . - 2012 . - pp. 236-253. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 2 (Février 2012) . - pp. 236-253 Mots-clés : Concrete  Aggregates  Spalling  Temperature  Pressures  Thermomecanical  stresses Résumé : This paper presents some experimental results on the behaviour of concrete at high temperature. The main objective is to analyse the influence of the type of aggregates on several material properties, and particularly upon the thermal instability risk (spalling) of the concrete. Different levels of observations have been chosen: from the study of small elements for the assessment of the main concrete properties at high temperature to the study of slabs to analyse the fire behaviour of the concretes. DEWEY : 624 ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/abs/10.1080/19648189.2012.667682

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