Detection of changes in global structural stiffness coefficients using acceleration feedback / Nebojsa Sebastijanovic in Journal of engineering mechanics, Vol. 136 N° 9 (Septembre 2010)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1187-1191 Titre : Detection of changes in global structural stiffness coefficients using acceleration feedback Type de document : texte imprimé Auteurs : Nebojsa Sebastijanovic, Auteur ; Henry T. Y. Yang, Auteur ; Tian-Wei Ma, Auteur Article en page(s) : pp. 1187-1191 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Damage Assessment Vibration Feedback control Structural reliability Monitoring Nondestructive tests Seismic effects. Résumé : This technical note presents an extension of a previous study where two methods for detecting structural damage have been developed by using displacement and velocity measurements. In this study, acceleration feedback is used in detecting changes in global structural stiffness coefficients of lumped-mass-shear-beam models. The previously developed method relies on the decoupling of effects of changes in stiffness at different locations and the use of displacement or velocity feedback has proven to be effective. Extension to the use of acceleration feedback using existing formulation is not trivial in that the desired decoupling effect cannot be achieved by simple coordinate transformation because the acceleration itself is directly related to the stiffness coefficients. An approach to circumvent this difficulty is presented and it involves increasing the order of time derivatives of the linear system so that the acceleration becomes the “velocity” of the new system. The performance of the proposed method is demonstrated using an illustrative example of a three-story model with stiffness changes at different floors. Numerical studies are also conducted to evaluate the time horizons required to normalize monitor outputs for the effective and efficient detection of stiffness changes. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...] [article] Detection of changes in global structural stiffness coefficients using acceleration feedback [texte imprimé] / Nebojsa Sebastijanovic, Auteur ; Henry T. Y. Yang, Auteur ; Tian-Wei Ma, Auteur . - pp. 1187-1191. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 136 N° 9 (Septembre 2010) . - pp. 1187-1191 Mots-clés : Damage Assessment Vibration Feedback control Structural reliability Monitoring Nondestructive tests Seismic effects. Résumé : This technical note presents an extension of a previous study where two methods for detecting structural damage have been developed by using displacement and velocity measurements. In this study, acceleration feedback is used in detecting changes in global structural stiffness coefficients of lumped-mass-shear-beam models. The previously developed method relies on the decoupling of effects of changes in stiffness at different locations and the use of displacement or velocity feedback has proven to be effective. Extension to the use of acceleration feedback using existing formulation is not trivial in that the desired decoupling effect cannot be achieved by simple coordinate transformation because the acceleration itself is directly related to the stiffness coefficients. An approach to circumvent this difficulty is presented and it involves increasing the order of time derivatives of the linear system so that the acceleration becomes the “velocity” of the new system. The performance of the proposed method is demonstrated using an illustrative example of a three-story model with stiffness changes at different floors. Numerical studies are also conducted to evaluate the time horizons required to normalize monitor outputs for the effective and efficient detection of stiffness changes. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JENMDT000 [...]

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