Documents disponibles écrits par cet auteur

Probabilistic models for modulus of elasticity of self-consolidated concrete / Gardoni, Paolo in Journal of engineering mechanics, Vol. 135 N° 4 (Avril 2009) 

Public ISBD [article]  in Journal of engineering mechanics > Vol. 135 N° 4 (Avril 2009) . - pp. 295-306 Titre : Probabilistic models for modulus of elasticity of self-consolidated concrete : bayesian approach Type de document : texte imprimé Auteurs : Gardoni, Paolo, Auteur ; David Trejo, Auteur ; Marina Vannucci, Auteur Année de publication : 2009 Article en page(s) : pp. 295-306 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Bayesian  analysis  Elasticity  Probability  Concrete. Résumé : Current models of the modulus of elasticity, E, of concrete recommended by the American Concrete Institute and the American Association of State Highway and Transportation Officials are derived for normally vibrated concrete (NVC). Because self-consolidated concrete (SCC) mixtures differ from NVC in the quantities and types of constituent materials, supplementary cementing materials, and chemical admixtures, the current models, may not take into consideration the complexity of SCC, and thus they may predict the E of SCC inaccurately. Although some authors recommend specific models to predict E of SCC, they include only a single variable of assumed importance, namely, the design compressive strength of concrete, fc[prime]. However, there are other parameters that may need to be accounted for while developing a prediction model for E of SCC. In this paper, a Bayesian variable selection method is used to identify the significant parameters in predicting the E of SCC, and more accurate models for E are generated using these variables. The models have a parsimonious parametrization for ease of use in practice and properly account for the prevailing uncertainties. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Probabilistic models for modulus of elasticity of self-consolidated concrete : bayesian approach [texte imprimé] / Gardoni, Paolo, Auteur ; David Trejo, Auteur ; Marina Vannucci, Auteur . - 2009 . - pp. 295-306. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 135 N° 4 (Avril 2009) . - pp. 295-306 Mots-clés : Bayesian  analysis  Elasticity  Probability  Concrete. Résumé : Current models of the modulus of elasticity, E, of concrete recommended by the American Concrete Institute and the American Association of State Highway and Transportation Officials are derived for normally vibrated concrete (NVC). Because self-consolidated concrete (SCC) mixtures differ from NVC in the quantities and types of constituent materials, supplementary cementing materials, and chemical admixtures, the current models, may not take into consideration the complexity of SCC, and thus they may predict the E of SCC inaccurately. Although some authors recommend specific models to predict E of SCC, they include only a single variable of assumed importance, namely, the design compressive strength of concrete, fc[prime]. However, there are other parameters that may need to be accounted for while developing a prediction model for E of SCC. In this paper, a Bayesian variable selection method is used to identify the significant parameters in predicting the E of SCC, and more accurate models for E are generated using these variables. The models have a parsimonious parametrization for ease of use in practice and properly account for the prevailing uncertainties. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

Shear characteristics and design for high-strength self-consolidating concrete / Young Hoon Kim in Journal of structural engineering, Vol. 136 N° 8 (Août 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 989-1000 Titre : Shear characteristics and design for high-strength self-consolidating concrete Type de document : texte imprimé Auteurs : Young Hoon Kim, Auteur ; Hueste, Mary Beth D., Auteur ; David Trejo, Auteur Année de publication : 2011 Article en page(s) : pp. 989-1000 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Self-consolidating  concrete  Shear  design  Aggregate  interlock  AASHTO  LRFD  design  specifications  Modified  compression  field  theory  Precast  Prestressed  members Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : To achieve adequate flow and homogeneous concrete for precast, prestressed members, self-consolidating concrete (SCC) typically has higher paste and lower coarse aggregate volumes than conventional concrete (CC). The lower aggregate content of SCC can affect the shear capacity of concrete systems. This research performed 48 push-off tests to investigate the influence of SCC aggregate and paste volumes on the shear capacity and these results were compared with those obtained from similar CC samples. The variables included coarse aggregate type (river gravel and limestone), three coarse aggregate volumes for the SCC mixtures, and two target 16-h release strengths [34 and 48 MPa (5 and 7 ksi)]. The aggregate type, aggregate volume, and concrete strength were found to have significant effects on the aggregate interlock. Test results were used to propose new aggregate interlock models based on the modified compression field theory adopted in the AASHTO Load and Resistance Factor Design Specifications. More appropriate expressions have been developed to determine the limiting value of concrete shear strength for CC and SCC precast, prestressed concrete girders with similar mixture proportions, and a 28-day compressive strength greater than 70 MPa (10 ksi). DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p989_s1?isAuthorized=no [article] Shear characteristics and design for high-strength self-consolidating concrete [texte imprimé] / Young Hoon Kim, Auteur ; Hueste, Mary Beth D., Auteur ; David Trejo, Auteur . - 2011 . - pp. 989-1000. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 8 (Août 2010) . - pp. 989-1000 Mots-clés : Self-consolidating  concrete  Shear  design  Aggregate  interlock  AASHTO  LRFD  design  specifications  Modified  compression  field  theory  Precast  Prestressed  members Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : To achieve adequate flow and homogeneous concrete for precast, prestressed members, self-consolidating concrete (SCC) typically has higher paste and lower coarse aggregate volumes than conventional concrete (CC). The lower aggregate content of SCC can affect the shear capacity of concrete systems. This research performed 48 push-off tests to investigate the influence of SCC aggregate and paste volumes on the shear capacity and these results were compared with those obtained from similar CC samples. The variables included coarse aggregate type (river gravel and limestone), three coarse aggregate volumes for the SCC mixtures, and two target 16-h release strengths [34 and 48 MPa (5 and 7 ksi)]. The aggregate type, aggregate volume, and concrete strength were found to have significant effects on the aggregate interlock. Test results were used to propose new aggregate interlock models based on the modified compression field theory adopted in the AASHTO Load and Resistance Factor Design Specifications. More appropriate expressions have been developed to determine the limiting value of concrete shear strength for CC and SCC precast, prestressed concrete girders with similar mixture proportions, and a 28-day compressive strength greater than 70 MPa (10 ksi). DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i8/p989_s1?isAuthorized=no