Documents disponibles écrits par cet auteur

Dynamic stress amplification caused by sudden failure of tension members in steel truss bridges / Yoshiaki Goto in Journal of structural engineering, Vol. 137 N° 8 (Août 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 8 (Août 2011) . - pp. 850-861 Titre : Dynamic stress amplification caused by sudden failure of tension members in steel truss bridges Type de document : texte imprimé Auteurs : Yoshiaki Goto, Auteur ; Naoki Kawanishi, Auteur ; Issei Honda, Auteur Année de publication : 2011 Article en page(s) : pp. 850-861 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Dynamic  stress  amplification  Redundancy  analysis  Impact  coefficient  Truss  bridge  Dynamic  analysis  Member  failure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The property of dynamic stress amplification resulting from the sudden failure of a tension member in a truss bridge is investigated by a precise dynamic response analysis. The primary sources of the dynamic stress amplification are from two types of impacts. The primary impact is attributable to longitudinal strain wave propagation from a failure point. The secondary impact is a result of the dynamic transition of equilibrium from a prefailure to a postfailure state. However, the effect of the primary impact is so small that it can be ignored in evaluating the impact coefficients used for the structural redundancy analysis. The impact coefficients for critical members in a structure take almost a constant value that ranges from 1.4 to 1.8, for which 5% structural damping is assumed, following the single degree of freedom model employed to evaluate the existing impact coefficient of 1.854. To avoid a cumbersome dynamic response analysis, the root mean square mode combination method is applied to calculate approximately the impact coefficients. The impact coefficients so calculated are moderately accurate for practical purposes. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i8/p850_s1?isAuthorized=no [article] Dynamic stress amplification caused by sudden failure of tension members in steel truss bridges [texte imprimé] / Yoshiaki Goto, Auteur ; Naoki Kawanishi, Auteur ; Issei Honda, Auteur . - 2011 . - pp. 850-861. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 8 (Août 2011) . - pp. 850-861 Mots-clés : Dynamic  stress  amplification  Redundancy  analysis  Impact  coefficient  Truss  bridge  Dynamic  analysis  Member  failure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The property of dynamic stress amplification resulting from the sudden failure of a tension member in a truss bridge is investigated by a precise dynamic response analysis. The primary sources of the dynamic stress amplification are from two types of impacts. The primary impact is attributable to longitudinal strain wave propagation from a failure point. The secondary impact is a result of the dynamic transition of equilibrium from a prefailure to a postfailure state. However, the effect of the primary impact is so small that it can be ignored in evaluating the impact coefficients used for the structural redundancy analysis. The impact coefficients for critical members in a structure take almost a constant value that ranges from 1.4 to 1.8, for which 5% structural damping is assumed, following the single degree of freedom model employed to evaluate the existing impact coefficient of 1.854. To avoid a cumbersome dynamic response analysis, the root mean square mode combination method is applied to calculate approximately the impact coefficients. The impact coefficients so calculated are moderately accurate for practical purposes. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i8/p850_s1?isAuthorized=no

Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete / Yoshiaki Goto in Journal of structural engineering, Vol. 138 N° 5 (Mai 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.571–584. Titre : Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete Type de document : texte imprimé Auteurs : Yoshiaki Goto, Auteur ; Kosuke Mizuno, Auteur ; Ghosh Prosenjit Kumar, Auteur Année de publication : 2012 Article en page(s) : pp.571–584. Note générale : Génie civil Langues : Anglais (eng) Mots-clés : CFT  column  Finite  element  method  Buckling  Metal  fracture  In-filled  concrete  Upgrading  mechanism Résumé : The strength, ductility, and energy dissipation capacity of thin-walled, stiffened rectangular concrete-filled steel columns (thin-walled stiffened RCFT columns) subjected to cyclic loads are significantly upgraded by filling with concrete the internal hollow space of rectangular steel tube with longitudinal stiffeners and diaphragms. However, because of the accumulation of plastic strains and the high tensile stress concentration in thin-walled steel columns, metal fracture sometimes occurs before the columns develop their high strength and ductility. To elucidate the behavior of CFT columns and prevent the premature failure resulting from metal fracture, it is necessary to develop some geometrically and materially nonlinear finite element (FE) models that can accurately take into account important factors such as cyclic local buckling, stress and strain concentrations in the steel tube, confinement of the in-filled concrete, and interface action between steel tube and in-filled concrete. In this paper an accurate and yet, numerically stable FE model, which fully includes these important factors, is proposed. The accuracy of the proposed model is confirmed by comparison with the existing cyclic-loading tests on thin-walled stiffened RCFT columns. By utilizing the numerical results obtained by the proposed FE model, the upgrading mechanism and metal fracture of thin-walled stiffened RCFT columns are discussed in detail. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000504 [article] Nonlinear finite element analysis for cyclic behavior of thin-walled stiffened rectangular steel columns with In-filled concrete [texte imprimé] / Yoshiaki Goto, Auteur ; Kosuke Mizuno, Auteur ; Ghosh Prosenjit Kumar, Auteur . - 2012 . - pp.571–584. Génie civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 5 (Mai 2012) . - pp.571–584. Mots-clés : CFT  column  Finite  element  method  Buckling  Metal  fracture  In-filled  concrete  Upgrading  mechanism Résumé : The strength, ductility, and energy dissipation capacity of thin-walled, stiffened rectangular concrete-filled steel columns (thin-walled stiffened RCFT columns) subjected to cyclic loads are significantly upgraded by filling with concrete the internal hollow space of rectangular steel tube with longitudinal stiffeners and diaphragms. However, because of the accumulation of plastic strains and the high tensile stress concentration in thin-walled steel columns, metal fracture sometimes occurs before the columns develop their high strength and ductility. To elucidate the behavior of CFT columns and prevent the premature failure resulting from metal fracture, it is necessary to develop some geometrically and materially nonlinear finite element (FE) models that can accurately take into account important factors such as cyclic local buckling, stress and strain concentrations in the steel tube, confinement of the in-filled concrete, and interface action between steel tube and in-filled concrete. In this paper an accurate and yet, numerically stable FE model, which fully includes these important factors, is proposed. The accuracy of the proposed model is confirmed by comparison with the existing cyclic-loading tests on thin-walled stiffened RCFT columns. By utilizing the numerical results obtained by the proposed FE model, the upgrading mechanism and metal fracture of thin-walled stiffened RCFT columns are discussed in detail. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000504

Nonlinear finite-element analysis for hysteretic behavior of thin-walled circular steel columns with in-filled concrete / Yoshiaki Goto in Journal of structural engineering, Vol. 136 N° 11 (Novembre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1413-1422 Titre : Nonlinear finite-element analysis for hysteretic behavior of thin-walled circular steel columns with in-filled concrete Type de document : texte imprimé Auteurs : Yoshiaki Goto, Auteur ; Ghosh Prosenjit Kumar, Auteur ; Naoki Kawanishi, Auteur Année de publication : 2011 Article en page(s) : pp. 1413-1422 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : CFT  column  FE  analysis  Local  buckling  Resisting  mechanism  Metal  fracture Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The strength and ductility of thin-walled steel columns under cyclic loads are considerably upgraded by filling concrete into hollow spaces surrounded by steel tube and diaphragms. The above thin-walled steel columns filled with concrete are referred here to as thin-walled CFT columns. Up to the present, no sufficient and precise research has been conducted on the versatile finite-element model (FE model) analysis that can take into account the upgrading mechanism of thin-walled CFT columns in a direct manner. Herein, an accurate FE model is investigated in order to fully include the important factors such as cyclic local buckling of steel tube, nonlinear behavior of confined concrete, and interface action between steel tube and in-filled concrete. The validity of the proposed models is examined by comparing with the results of cyclic loading experiments on CFT columns. With the proposed model, the effect of in-filled concrete on the upgrading mechanism of thin-walled CFT columns is discussed in detail. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1413_s1?isAuthorized=no [article] Nonlinear finite-element analysis for hysteretic behavior of thin-walled circular steel columns with in-filled concrete [texte imprimé] / Yoshiaki Goto, Auteur ; Ghosh Prosenjit Kumar, Auteur ; Naoki Kawanishi, Auteur . - 2011 . - pp. 1413-1422. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 11 (Novembre 2010) . - pp. 1413-1422 Mots-clés : CFT  column  FE  analysis  Local  buckling  Resisting  mechanism  Metal  fracture Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : The strength and ductility of thin-walled steel columns under cyclic loads are considerably upgraded by filling concrete into hollow spaces surrounded by steel tube and diaphragms. The above thin-walled steel columns filled with concrete are referred here to as thin-walled CFT columns. Up to the present, no sufficient and precise research has been conducted on the versatile finite-element model (FE model) analysis that can take into account the upgrading mechanism of thin-walled CFT columns in a direct manner. Herein, an accurate FE model is investigated in order to fully include the important factors such as cyclic local buckling of steel tube, nonlinear behavior of confined concrete, and interface action between steel tube and in-filled concrete. The validity of the proposed models is examined by comparing with the results of cyclic loading experiments on CFT columns. With the proposed model, the effect of in-filled concrete on the upgrading mechanism of thin-walled CFT columns is discussed in detail. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i11/p1413_s1?isAuthorized=no