Documents disponibles écrits par cet auteur

Krylov subspace accelerated newton algorithm / Michael H. Scott in Journal of structural engineering, Vol. 136 N° 5 (Mai 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 473-480 Titre : Krylov subspace accelerated newton algorithm : application to dynamic progressive collapse simulation of frames Type de document : texte imprimé Auteurs : Michael H. Scott, Auteur ; Gregory L. Fenves, Auteur Année de publication : 2011 Article en page(s) : pp. 473-480 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Algorithms  Collapse  Nonlinear  analysis  Progressive  failure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An accelerated Newton algorithm based on Krylov subspaces is applied to solving nonlinear equations of structural equilibrium. The algorithm uses a low-rank least-squares analysis to advance the search for equilibrium at the degrees of freedom (DOFs) where the largest changes in structural state occur; then it corrects for smaller changes at the remaining DOFs using a modified Newton computation. The algorithm is suited to simulating the dynamic progressive collapse analysis of frames where yielding and local collapse mechanisms form at a small number of DOFs while the state of the remaining structural components is relatively linear. In addition, the algorithm is able to resolve erroneous search directions that arise from approximation errors in the tangent stiffness matrix. Numerical examples indicate that the Krylov subspace algorithm has a larger radius of convergence and requires fewer matrix factorizations than Newton-Raphson in the dynamic progressive collapse simulation of reinforced concrete and steel frames. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p473_s1?isAuthorized=no [article] Krylov subspace accelerated newton algorithm : application to dynamic progressive collapse simulation of frames [texte imprimé] / Michael H. Scott, Auteur ; Gregory L. Fenves, Auteur . - 2011 . - pp. 473-480. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 5 (Mai 2010) . - pp. 473-480 Mots-clés : Algorithms  Collapse  Nonlinear  analysis  Progressive  failure Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : An accelerated Newton algorithm based on Krylov subspaces is applied to solving nonlinear equations of structural equilibrium. The algorithm uses a low-rank least-squares analysis to advance the search for equilibrium at the degrees of freedom (DOFs) where the largest changes in structural state occur; then it corrects for smaller changes at the remaining DOFs using a modified Newton computation. The algorithm is suited to simulating the dynamic progressive collapse analysis of frames where yielding and local collapse mechanisms form at a small number of DOFs while the state of the remaining structural components is relatively linear. In addition, the algorithm is able to resolve erroneous search directions that arise from approximation errors in the tangent stiffness matrix. Numerical examples indicate that the Krylov subspace algorithm has a larger radius of convergence and requires fewer matrix factorizations than Newton-Raphson in the dynamic progressive collapse simulation of reinforced concrete and steel frames. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i5/p473_s1?isAuthorized=no

Seismic damage detection of a full-scale shaking table test structure / Ji, Xiaodong in Journal of structural engineering, Vol. 137 N° 1 (Janvier 2011) 

Public ISBD [article]  in Journal of structural engineering > Vol. 137 N° 1 (Janvier 2011) . - pp. 14-21 Titre : Seismic damage detection of a full-scale shaking table test structure Type de document : texte imprimé Auteurs : Ji, Xiaodong, Auteur ; Gregory L. Fenves, Auteur ; Kajiwara, Kouichi, Auteur Année de publication : 2011 Article en page(s) : pp. 14-21 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Damage  detection  Health  monitoring  System  identification  Steel  moment  frame  Seismic  damage Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A series of full-scale tests was conducted on the E-Defense shaking table facilities in Japan to simulate various levels of realistic seismic damage in a high-rise structural steel building. During the shaking table tests, the specimen experienced damage of the concrete slabs, beam-to-column connections, and nonstructural walls. The densely recorded test data of global and local structural deformation and the extensive acceleration records provide a unique benchmark case for evaluating the effectiveness of vibration-based damage diagnosis methods. Dynamic properties of the specimen were extracted from floor accelerations under the white noise excitations by the frequency response function curve-fitting method and autoregressive with exogenous term method. The natural frequencies of the structure decreased on average 4.1, 5.4, and 11.9% after three levels of seismic excitation, respectively, because of increasing extent of structural and nonstructural damage. The analysis of the vibration data shows that the mode shapes changed very little because the damage was distributed over the entire specimen rather than being concentrated on one floor or story for the high-rise moment frame building. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i1/p14_s1?isAuthorized=no [article] Seismic damage detection of a full-scale shaking table test structure [texte imprimé] / Ji, Xiaodong, Auteur ; Gregory L. Fenves, Auteur ; Kajiwara, Kouichi, Auteur . - 2011 . - pp. 14-21. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 137 N° 1 (Janvier 2011) . - pp. 14-21 Mots-clés : Damage  detection  Health  monitoring  System  identification  Steel  moment  frame  Seismic  damage Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : A series of full-scale tests was conducted on the E-Defense shaking table facilities in Japan to simulate various levels of realistic seismic damage in a high-rise structural steel building. During the shaking table tests, the specimen experienced damage of the concrete slabs, beam-to-column connections, and nonstructural walls. The densely recorded test data of global and local structural deformation and the extensive acceleration records provide a unique benchmark case for evaluating the effectiveness of vibration-based damage diagnosis methods. Dynamic properties of the specimen were extracted from floor accelerations under the white noise excitations by the frequency response function curve-fitting method and autoregressive with exogenous term method. The natural frequencies of the structure decreased on average 4.1, 5.4, and 11.9% after three levels of seismic excitation, respectively, because of increasing extent of structural and nonstructural damage. The analysis of the vibration data shows that the mode shapes changed very little because the damage was distributed over the entire specimen rather than being concentrated on one floor or story for the high-rise moment frame building. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v137/i1/p14_s1?isAuthorized=no

Seismic damage detection of a full-scale shaking table test structure / Ji, Xiaodong in Journal of structural engineering, Vol. 138 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1417-1418 Titre : Seismic damage detection of a full-scale shaking table test structure Type de document : texte imprimé Auteurs : Ji, Xiaodong, Auteur ; Gregory L. Fenves, Auteur ; Kajiwara, Kouichi, Auteur Année de publication : 2013 Article en page(s) : pp. 1417-1418 Note générale : Génie Civil Langues : Anglais (eng) Note de contenu : Discussion ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000647 [article] Seismic damage detection of a full-scale shaking table test structure [texte imprimé] / Ji, Xiaodong, Auteur ; Gregory L. Fenves, Auteur ; Kajiwara, Kouichi, Auteur . - 2013 . - pp. 1417-1418. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 11 (Novembre 2012) . - pp. 1417-1418 Note de contenu : Discussion ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000647