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Output-only modal identification of ancient l’Aquila city hall and civic tower / G. P. Cimellaro in Journal of structural engineering, Vol. 138 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of structural engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 481–491 Titre : Output-only modal identification of ancient l’Aquila city hall and civic tower Type de document : texte imprimé Auteurs : G. P. Cimellaro, Auteur ; S. Piantà, Auteur ; A. De Stefano, Auteur Année de publication : 2012 Article en page(s) : pp. 481–491 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Output-only  modal  identification  Frequency  domain  decomposition  (FDD)  Eigensystem  realization  algorithm  (ERA)  Random  decrement  (RD)  Masonry  structure  Finite-element  model  Ambient  vibration  Identification  EMA  Operational  modal  analysis Résumé : The ancient masonry city hall in L’Aquila, Italy (Margherita Palace) that was severely damaged during the L’Aquila earthquake in April 2009 has been subjected to ambient vibration tests to determine its dynamic characteristics such as the natural frequencies, mode shapes, and damping ratios. The processing of ambient vibration responses is performed with three output-only identification approaches: (1) the frequency-domain decomposition, (2) random decrement (RD) technique combined with the eigensystem realization algorithm (ERA), and (3) the natural excitation technique (NExT) combined with ERA. Measurements were made in the palace and in the civic tower using 15 sensors in three different configurations, and the ambient vibration tests involved the simultaneous measurements of longitudinal and lateral vibrations. Lateral vibration modes for the civic tower were identified clearly; a total of five modal shapes and frequencies were identified in the frequency range 0 to 7 Hz. The modal identification in the palace was more difficult because of the severe damage; however, the two bending modes in the perpendicular directions were identified. The comparison of the three experimental techniques shows good agreement, confirming the reliability of the three identification methods. The results of the modal identification have been used to update the finite-element model of the palace. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000494 [article] Output-only modal identification of ancient l’Aquila city hall and civic tower [texte imprimé] / G. P. Cimellaro, Auteur ; S. Piantà, Auteur ; A. De Stefano, Auteur . - 2012 . - pp. 481–491. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 481–491 Mots-clés : Output-only  modal  identification  Frequency  domain  decomposition  (FDD)  Eigensystem  realization  algorithm  (ERA)  Random  decrement  (RD)  Masonry  structure  Finite-element  model  Ambient  vibration  Identification  EMA  Operational  modal  analysis Résumé : The ancient masonry city hall in L’Aquila, Italy (Margherita Palace) that was severely damaged during the L’Aquila earthquake in April 2009 has been subjected to ambient vibration tests to determine its dynamic characteristics such as the natural frequencies, mode shapes, and damping ratios. The processing of ambient vibration responses is performed with three output-only identification approaches: (1) the frequency-domain decomposition, (2) random decrement (RD) technique combined with the eigensystem realization algorithm (ERA), and (3) the natural excitation technique (NExT) combined with ERA. Measurements were made in the palace and in the civic tower using 15 sensors in three different configurations, and the ambient vibration tests involved the simultaneous measurements of longitudinal and lateral vibrations. Lateral vibration modes for the civic tower were identified clearly; a total of five modal shapes and frequencies were identified in the frequency range 0 to 7 Hz. The modal identification in the palace was more difficult because of the severe damage; however, the two bending modes in the perpendicular directions were identified. The comparison of the three experimental techniques shows good agreement, confirming the reliability of the three identification methods. The results of the modal identification have been used to update the finite-element model of the palace. ISSN : 0733-9445 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000494