Documents disponibles écrits par cet auteur

Branch plate-to-circular hollow structural section connections. I / Andrew P. Voth in Journal of structural engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.995–1006. Titre : Branch plate-to-circular hollow structural section connections. I : Experimental investigation and finite-element modeling Type de document : texte imprimé Auteurs : Andrew P. Voth, Auteur ; Jeffrey A. Packer, Auteur Année de publication : 2012 Article en page(s) : pp.995–1006. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Steel  structure,  Hollow  structural  section,  Circular  hollow  section,  Tube,  Connection,  Branch  plate,  Through  plate,  Stiffening  Finite-element  modeling  Static  loading Résumé : Although branch plate-to-circular hollow section (CHS) connections under branch axial load are simple to fabricate and cost-effective, they generally experience significant deformation at relatively low loads resulting in an imposed deformation limit. To increase the connection capacity, various stiffening methods such as use of ring stiffeners, grout filling, and “through plate” connections have been proposed. To determine the effectiveness of previously unstudied plate-to-CHS through plate connections, an experimental investigation consisting of 12 connections was undertaken. Additionally, the behavior of nonorthogonal or skewed connections and the effect of load sense were examined. The experimental study determined that through plate-to-CHS connection behavior can be obtained by algebraically combining the behavior of a T-type branch plate-to-CHS connection in tension with another in compression. Moreover, the through plate connection increased the capacity by more than three times that of a branch plate connection loaded in compression. Finite-element (FE) models were constructed to replicate, and be compared with, the experimental connections to validate the use of FE modeling for a subsequent parametric study with the aim of expanding the scope of the experimental results database. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000505 [article] Branch plate-to-circular hollow structural section connections. I : Experimental investigation and finite-element modeling [texte imprimé] / Andrew P. Voth, Auteur ; Jeffrey A. Packer, Auteur . - 2012 . - pp.995–1006. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp.995–1006. Mots-clés : Steel  structure,  Hollow  structural  section,  Circular  hollow  section,  Tube,  Connection,  Branch  plate,  Through  plate,  Stiffening  Finite-element  modeling  Static  loading Résumé : Although branch plate-to-circular hollow section (CHS) connections under branch axial load are simple to fabricate and cost-effective, they generally experience significant deformation at relatively low loads resulting in an imposed deformation limit. To increase the connection capacity, various stiffening methods such as use of ring stiffeners, grout filling, and “through plate” connections have been proposed. To determine the effectiveness of previously unstudied plate-to-CHS through plate connections, an experimental investigation consisting of 12 connections was undertaken. Additionally, the behavior of nonorthogonal or skewed connections and the effect of load sense were examined. The experimental study determined that through plate-to-CHS connection behavior can be obtained by algebraically combining the behavior of a T-type branch plate-to-CHS connection in tension with another in compression. Moreover, the through plate connection increased the capacity by more than three times that of a branch plate connection loaded in compression. Finite-element (FE) models were constructed to replicate, and be compared with, the experimental connections to validate the use of FE modeling for a subsequent parametric study with the aim of expanding the scope of the experimental results database. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000505

Branch plate-to-circular hollow structural section connections. II / Andrew P. Voth in Journal of structural engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp. 1007–1018. Titre : Branch plate-to-circular hollow structural section connections. II : X-type parametric numerical study and design Type de document : texte imprimé Auteurs : Andrew P. Voth, Auteur ; Jeffrey A. Packer, Auteur Année de publication : 2012 Article en page(s) : pp. 1007–1018. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : Steel  structure  Hollow  structural  section  Circular  hollow  section  Tube  Connection  Branch  plate  Chord  normal  stress  Finite-element  modeling  Boundary  condition  Static  loading Résumé : This paper presents a numerical finite-element parametric study on the behavior of transverse or longitudinal X-type plate-to-circular hollow section connections loaded under branch plate tension or compression, to evaluate the suitability of present international (CIDECT) design recommendations, the effect of boundary conditions and chord length, and the influence of applied chord normal stress. A total of 449 connections with wide-ranging values of geometric properties and chord normal stress levels were modeled and analyzed using commercially available software. An analysis of the effect of chord length determined that, to exclude the influence of chord end boundary conditions, an effective chord length of at least 10 times the chord diameter should be used for experimental and numerical studies. Further, the present CIDECT chord stress functions (Qf) provide an acceptable lower bound for all connections examined. Evaluation of present CIDECT partial design strength functions (Qu) indicated general conservatism, lack of plate thickness incorporation, and underutilization of tension-only connections. Partial design strength functions, determined through regression analysis, are hence proposed with lower-bound reduction (resistance) factors. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000545 [article] Branch plate-to-circular hollow structural section connections. II : X-type parametric numerical study and design [texte imprimé] / Andrew P. Voth, Auteur ; Jeffrey A. Packer, Auteur . - 2012 . - pp. 1007–1018. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 8 (Août 2012) . - pp. 1007–1018. Mots-clés : Steel  structure  Hollow  structural  section  Circular  hollow  section  Tube  Connection  Branch  plate  Chord  normal  stress  Finite-element  modeling  Boundary  condition  Static  loading Résumé : This paper presents a numerical finite-element parametric study on the behavior of transverse or longitudinal X-type plate-to-circular hollow section connections loaded under branch plate tension or compression, to evaluate the suitability of present international (CIDECT) design recommendations, the effect of boundary conditions and chord length, and the influence of applied chord normal stress. A total of 449 connections with wide-ranging values of geometric properties and chord normal stress levels were modeled and analyzed using commercially available software. An analysis of the effect of chord length determined that, to exclude the influence of chord end boundary conditions, an effective chord length of at least 10 times the chord diameter should be used for experimental and numerical studies. Further, the present CIDECT chord stress functions (Qf) provide an acceptable lower bound for all connections examined. Evaluation of present CIDECT partial design strength functions (Qu) indicated general conservatism, lack of plate thickness incorporation, and underutilization of tension-only connections. Partial design strength functions, determined through regression analysis, are hence proposed with lower-bound reduction (resistance) factors. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000545

Defect tolerance for cast steel connections in braced frames / Tsutomu Iwashita in Journal of structural engineering, Vol. 138 N° 12 (Décembre 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1455–1464 Titre : Defect tolerance for cast steel connections in braced frames Type de document : texte imprimé Auteurs : Tsutomu Iwashita, Auteur ; Jeffrey A. Packer, Auteur ; Juan-Carlos De Oliveira, Auteur Année de publication : 2013 Article en page(s) : pp. 1455–1464 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Brittle  fracture  Cast  steel  connectors  Circular  hollow  section  braces  Defects  Fracture  toughness  Plastic  constraint  Toughness  scaling  model  Tubes Résumé : During the last decade, various steel casting products for steel building structures have been developed, such as connectors between brace members and gusset plates in braced frames. Some casting products are welded to steel sections such as tubular members and I-section members in building structures, where these members are expected to develop their capacity during a large-scale earthquake. In this situation, brittle fracture can be another concern of the casting products if there are defects in the connections. A study of defect tolerance for cast steel connections is therefore very important to prevent brittle fracture from weld defects or casting defects. This paper describes defect tolerances for cast steel connections in braced frames and explores the possibility of brittle fracture from assumed defects in typical cast steel connectors. A parametric study, which investigates the sensitivity of brittle fracture to defect size, defect location, and material mismatch effects, is described through cast steel connector models. A toughness scaling model is used for evaluating the occurrence of brittle fracture from assumed defects in the models. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000583 [article] Defect tolerance for cast steel connections in braced frames [texte imprimé] / Tsutomu Iwashita, Auteur ; Jeffrey A. Packer, Auteur ; Juan-Carlos De Oliveira, Auteur . - 2013 . - pp. 1455–1464. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 12 (Décembre 2012) . - pp. 1455–1464 Mots-clés : Brittle  fracture  Cast  steel  connectors  Circular  hollow  section  braces  Defects  Fracture  toughness  Plastic  constraint  Toughness  scaling  model  Tubes Résumé : During the last decade, various steel casting products for steel building structures have been developed, such as connectors between brace members and gusset plates in braced frames. Some casting products are welded to steel sections such as tubular members and I-section members in building structures, where these members are expected to develop their capacity during a large-scale earthquake. In this situation, brittle fracture can be another concern of the casting products if there are defects in the connections. A study of defect tolerance for cast steel connections is therefore very important to prevent brittle fracture from weld defects or casting defects. This paper describes defect tolerances for cast steel connections in braced frames and explores the possibility of brittle fracture from assumed defects in typical cast steel connectors. A parametric study, which investigates the sensitivity of brittle fracture to defect size, defect location, and material mismatch effects, is described through cast steel connector models. A toughness scaling model is used for evaluating the occurrence of brittle fracture from assumed defects in the models. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000583