Documents disponibles écrits par cet auteur

Drive-in steel storage racks / Zhang, Hao in Journal of structural engineering, Vol. 138 N° 2 (Fevrier 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 148-156 Titre : Drive-in steel storage racks : II: Reliability-based design for forklift truck impact Type de document : texte imprimé Auteurs : Zhang, Hao, Auteur ; Benoit P. Gilbert, Auteur ; Kim J. R. Rasmussen, Auteur Année de publication : 2012 Article en page(s) : pp. 148-156 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Drive-in  racks  Impact  forces  Probability-based  design  Steel  Steel  storage  racks  Structural  reliability Résumé : Steel drive-in racks are susceptible to structural failure from accidental impact by operating forklift trucks. Under impact, the upright bends and the supported pallets may drop through the rack to cause structural collapse if the bay opening exceeds the pallet bearing width. This drop-through limit state has not been considered in existing rack design standards. This paper proposes a simple equation to calculate the equivalent static impact force based on recent tests and nonlinear dynamic analysis of drive-in steel racks. An impact load factor is developed on the basis of a structural reliability assessment, taking into account the uncertain nature of the impact force, structural resistance, and models used in structural analysis. In design practice, the bay opening is determined from factored impact loads and is not to exceed specified limits. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p148_s1?isAuthorized=no [article] Drive-in steel storage racks : II: Reliability-based design for forklift truck impact [texte imprimé] / Zhang, Hao, Auteur ; Benoit P. Gilbert, Auteur ; Kim J. R. Rasmussen, Auteur . - 2012 . - pp. 148-156. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 2 (Fevrier 2012) . - pp. 148-156 Mots-clés : Drive-in  racks  Impact  forces  Probability-based  design  Steel  Steel  storage  racks  Structural  reliability Résumé : Steel drive-in racks are susceptible to structural failure from accidental impact by operating forklift trucks. Under impact, the upright bends and the supported pallets may drop through the rack to cause structural collapse if the bay opening exceeds the pallet bearing width. This drop-through limit state has not been considered in existing rack design standards. This paper proposes a simple equation to calculate the equivalent static impact force based on recent tests and nonlinear dynamic analysis of drive-in steel racks. An impact load factor is developed on the basis of a structural reliability assessment, taking into account the uncertain nature of the impact force, structural resistance, and models used in structural analysis. In design practice, the bay opening is determined from factored impact loads and is not to exceed specified limits. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i2/p148_s1?isAuthorized=no

Net section tension capacity of bolted connections in cold-reduced steel sheets / Teh, Lip H. in Journal of structural engineering, Vol. 138 N° 3 (Mars 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 337-344 Titre : Net section tension capacity of bolted connections in cold-reduced steel sheets Type de document : texte imprimé Auteurs : Teh, Lip H., Auteur ; Benoit P. Gilbert, Auteur Année de publication : 2012 Article en page(s) : pp. 337-344 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Bolted  connections  Cold-formed  steel  Net  section  tension  capacity  Steel  plates  Tensile  strength Résumé : This paper examines the accuracy of design equations specified in the North American, European and Australasian codes for cold-formed steel structures in determining the net section tension capacity of bolted connections in flat steel sheets. It points out that the shear lag factors embedded in the code equations either yield “anomalous” results or become irrelevant when they exceed unity. The “anomaly” was demonstrated through laboratory tests and is explained by using simple calculus. The configurations of specimens tested in the laboratory include single shear- and double-shear connections, with single or double bolts in a line parallel or perpendicular to the force. A proper mathematical expression for the in-plane shear lag factor, which does not suffer from the anomaly of the code equations and never implies shear lag factors greater than unity for any configuration, is presented and shown to yield improved results compared to the current specifications. The resistance factor of 0.8 for the proposed equation is computed with respect to the load and resistance factor design (LRFD) approach specified in the North American specification for the design of cold-formed steel structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i3/p337_s1?isAuthorized=no [article] Net section tension capacity of bolted connections in cold-reduced steel sheets [texte imprimé] / Teh, Lip H., Auteur ; Benoit P. Gilbert, Auteur . - 2012 . - pp. 337-344. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 337-344 Mots-clés : Bolted  connections  Cold-formed  steel  Net  section  tension  capacity  Steel  plates  Tensile  strength Résumé : This paper examines the accuracy of design equations specified in the North American, European and Australasian codes for cold-formed steel structures in determining the net section tension capacity of bolted connections in flat steel sheets. It points out that the shear lag factors embedded in the code equations either yield “anomalous” results or become irrelevant when they exceed unity. The “anomaly” was demonstrated through laboratory tests and is explained by using simple calculus. The configurations of specimens tested in the laboratory include single shear- and double-shear connections, with single or double bolts in a line parallel or perpendicular to the force. A proper mathematical expression for the in-plane shear lag factor, which does not suffer from the anomaly of the code equations and never implies shear lag factors greater than unity for any configuration, is presented and shown to yield improved results compared to the current specifications. The resistance factor of 0.8 for the proposed equation is computed with respect to the load and resistance factor design (LRFD) approach specified in the North American specification for the design of cold-formed steel structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v138/i3/p337_s1?isAuthorized=no

Net section tension capacity of cold-reduced sheet steel angle braces bolted at one leg / Teh, Lip H. in Journal of structural engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 328–337 Titre : Net section tension capacity of cold-reduced sheet steel angle braces bolted at one leg Type de document : texte imprimé Auteurs : Teh, Lip H., Auteur ; Benoit P. Gilbert, Auteur Année de publication : 2013 Article en page(s) : pp. 328–337 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : bolted  connections;  cold-formed  steel;  shear  lag;  tensile  strength;  thin  wall  sections;  bracing Résumé : This paper examines the accuracy of equations specified by the North American and Australasian steel structures codes for determining the net section tension capacity of a cold-formed steel angle brace bolted at one leg. The configurations tested in the laboratory include single equal angle, single unequal angle bolted at the wider leg, single unequal angle bolted at the narrow leg, double angles, and alternate angles. The steel materials used in the experiment are among those with the lowest ductility for which nominal tensile strength is permitted by cold-formed steel design codes to be fully utilized in structural design calculations. Based on a modification to the equation derived for channel braces bolted at the web, a design equation is proposed for determining the net section tension capacity of a cold-formed steel angle brace bolted at one leg. The proposed equation is demonstrated, through laboratory tests on 61 specimens composed of G450 sheet steel, to be more accurate than the code equations and those existing in the literature. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000675 [article] Net section tension capacity of cold-reduced sheet steel angle braces bolted at one leg [texte imprimé] / Teh, Lip H., Auteur ; Benoit P. Gilbert, Auteur . - 2013 . - pp. 328–337. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 328–337 Mots-clés : bolted  connections;  cold-formed  steel;  shear  lag;  tensile  strength;  thin  wall  sections;  bracing Résumé : This paper examines the accuracy of equations specified by the North American and Australasian steel structures codes for determining the net section tension capacity of a cold-formed steel angle brace bolted at one leg. The configurations tested in the laboratory include single equal angle, single unequal angle bolted at the wider leg, single unequal angle bolted at the narrow leg, double angles, and alternate angles. The steel materials used in the experiment are among those with the lowest ductility for which nominal tensile strength is permitted by cold-formed steel design codes to be fully utilized in structural design calculations. Based on a modification to the equation derived for channel braces bolted at the web, a design equation is proposed for determining the net section tension capacity of a cold-formed steel angle brace bolted at one leg. The proposed equation is demonstrated, through laboratory tests on 61 specimens composed of G450 sheet steel, to be more accurate than the code equations and those existing in the literature. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000675