Documents disponibles écrits par cet auteur

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

A substructure shaking table test for reproduction of earthquake responses of high-rise buildings / Ji, Xiaodong in Earthquake engineering structural dynamics, Vol. 38 N° 12 (Octobre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 12 (Octobre 2009) . - pp. 1381-1399 Titre : A substructure shaking table test for reproduction of earthquake responses of high-rise buildings Type de document : texte imprimé Auteurs : Ji, Xiaodong, Auteur ; Kajiwara, Kouichi, Auteur ; Nagae, Takuya, Auteur ; Ryuta Enokida ; Nakashima, Masayoshi Article en page(s) : pp. 1381-1399 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Shaking  table  test;  Substructure;  IDCS  algorithm;  Model  matching  method;  H  method;  high-rise  building Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : When subjected to long-period ground motions, high-rise buildings' upper floors undergo large responses. Furniture and nonstructural components are susceptible to significant damage in such events. This paper proposes a full-scale substructure shaking table test to reproduce large floor responses of high-rise buildings. The response at the top floor of a virtual 30-story building model subjected to a synthesized long-period ground motion is taken as a target wave for reproduction. Since a shaking table has difficulties in directly reproducing such large responses due to various capacity limitations, a rubber-and-mass system is proposed to amplify the table motion. To achieve an accurate reproduction of the floor responses, a control algorithm called the open-loop inverse dynamics compensation via simulation (IDCS) algorithm is used to generate a special input wave for the shaking table. To implement the IDCS algorithm, the model matching method and the H method are adopted to construct the controller. A numerical example is presented to illustrate the open-loop IDCS algorithm and compare the performance of different methods of controller design. A series of full-scale substructure shaking table tests are conducted in E-Defense to verify the effectiveness of the proposed method and examine the seismic behavior of furniture. The test results demonstrate that the rubber-and-mass system is capable of amplifying the table motion by a factor of about 3.5 for the maximum velocity and displacement, and the substructure shaking table test can reproduce the large floor responses for a few minutes ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] A substructure shaking table test for reproduction of earthquake responses of high-rise buildings [texte imprimé] / Ji, Xiaodong, Auteur ; Kajiwara, Kouichi, Auteur ; Nagae, Takuya, Auteur ; Ryuta Enokida ; Nakashima, Masayoshi . - pp. 1381-1399. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 12 (Octobre 2009) . - pp. 1381-1399 Mots-clés : Shaking  table  test;  Substructure;  IDCS  algorithm;  Model  matching  method;  H  method;  high-rise  building Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : When subjected to long-period ground motions, high-rise buildings' upper floors undergo large responses. Furniture and nonstructural components are susceptible to significant damage in such events. This paper proposes a full-scale substructure shaking table test to reproduce large floor responses of high-rise buildings. The response at the top floor of a virtual 30-story building model subjected to a synthesized long-period ground motion is taken as a target wave for reproduction. Since a shaking table has difficulties in directly reproducing such large responses due to various capacity limitations, a rubber-and-mass system is proposed to amplify the table motion. To achieve an accurate reproduction of the floor responses, a control algorithm called the open-loop inverse dynamics compensation via simulation (IDCS) algorithm is used to generate a special input wave for the shaking table. To implement the IDCS algorithm, the model matching method and the H method are adopted to construct the controller. A numerical example is presented to illustrate the open-loop IDCS algorithm and compare the performance of different methods of controller design. A series of full-scale substructure shaking table tests are conducted in E-Defense to verify the effectiveness of the proposed method and examine the seismic behavior of furniture. The test results demonstrate that the rubber-and-mass system is capable of amplifying the table motion by a factor of about 3.5 for the maximum velocity and displacement, and the substructure shaking table test can reproduce the large floor responses for a few minutes ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe