Experimental verification of the flexibility-based damage locating vector method / Y. Gao in Journal of engineering mechanics, Vol. 133 N°10 (Octobre 2007)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 133 N°10 (Octobre 2007) . - pp.1043–1049 Titre : Experimental verification of the flexibility-based damage locating vector method Type de document : texte imprimé Auteurs : Y. Gao, Auteur ; B. F. Spencer, Auteur ; Dionisio Bernal, Auteur Année de publication : 2007 Article en page(s) : pp.1043–1049 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Experimentation Damage Flexibility Structural dynamics Trusse Résumé : In recent years, numerous approaches have been proposed for detecting damage in structures, in which the flexibility-based damage locating vector (DLV) method is one of the promising techniques. By computing a set of load vectors from the change of the flexibility matrix before and after damage and then applying them as static forces to the undamaged analytical model for static computation, the DLV method is able to locate damage in structures. The main purpose of this paper is to experimentally verify this method. Following a brief introduction and discussion of the motivation for the flexibility-based method, an overview of the DLV method and construction of the flexibility matrix from limited sensor information is presented. The DLV method is then experimentally verified employing a 5.6 m (18 ft)-long three-dimensional truss structure. To simulate damage in the structure, the original truss member is replaced by one with reduced stiffness. Experimental results show that the DLV method can successfully detect the damage using a limited number of sensors and modes. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=1043&volume=133&issue=10&journal [...] [article] Experimental verification of the flexibility-based damage locating vector method [texte imprimé] / Y. Gao, Auteur ; B. F. Spencer, Auteur ; Dionisio Bernal, Auteur . - 2007 . - pp.1043–1049. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°10 (Octobre 2007) . - pp.1043–1049 Mots-clés : Experimentation Damage Flexibility Structural dynamics Trusse Résumé : In recent years, numerous approaches have been proposed for detecting damage in structures, in which the flexibility-based damage locating vector (DLV) method is one of the promising techniques. By computing a set of load vectors from the change of the flexibility matrix before and after damage and then applying them as static forces to the undamaged analytical model for static computation, the DLV method is able to locate damage in structures. The main purpose of this paper is to experimentally verify this method. Following a brief introduction and discussion of the motivation for the flexibility-based method, an overview of the DLV method and construction of the flexibility matrix from limited sensor information is presented. The DLV method is then experimentally verified employing a 5.6 m (18 ft)-long three-dimensional truss structure. To simulate damage in the structure, the original truss member is replaced by one with reduced stiffness. Experimental results show that the DLV method can successfully detect the damage using a limited number of sensors and modes. ISSN : 0733-9399 En ligne : http://ascelibrary.org/action/showAbstract?page=1043&volume=133&issue=10&journal [...]

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Multimetric sensing for structural damage detection / S. H. Sim in Journal of engineering mechanics, Vol. 137 N° 1 (Janvier 2011)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.22-23 Titre : Multimetric sensing for structural damage detection Type de document : texte imprimé Auteurs : S. H. Sim, Auteur ; B. F. Spencer, Auteur ; T. Nagayama, Auteur Année de publication : 2011 Article en page(s) : pp.22-23 Note générale : Mécanique appliquée Langues : Anglais (eng) Mots-clés : Structural reliability Monitoring Damage Infrastructure. Résumé : Vibration-based damage detection methods have been widely studied for structural health monitoring of civil infrastructure. Acceleration measurements are frequently employed to extract the dynamic characteristics of the structure and locate damage because they can be obtained conveniently and possess relatively little noise. However, considering the fact that damage is a local phenomenon, the sole use of acceleration measurements that are intrinsically global structural responses limits damage detection capabilities. This paper investigates the possibility of using both global and local measurements to improve the accuracy and robustness of damage detection methods. A multimetric approach based on the damage locating vector method is proposed. Numerical simulations are conducted to verify the efficacy of the proposed approach. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p22_s1?isAuthorized=no [article] Multimetric sensing for structural damage detection [texte imprimé] / S. H. Sim, Auteur ; B. F. Spencer, Auteur ; T. Nagayama, Auteur . - 2011 . - pp.22-23. Mécanique appliquée Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 137 N° 1 (Janvier 2011) . - pp.22-23 Mots-clés : Structural reliability Monitoring Damage Infrastructure. Résumé : Vibration-based damage detection methods have been widely studied for structural health monitoring of civil infrastructure. Acceleration measurements are frequently employed to extract the dynamic characteristics of the structure and locate damage because they can be obtained conveniently and possess relatively little noise. However, considering the fact that damage is a local phenomenon, the sole use of acceleration measurements that are intrinsically global structural responses limits damage detection capabilities. This paper investigates the possibility of using both global and local measurements to improve the accuracy and robustness of damage detection methods. A multimetric approach based on the damage locating vector method is proposed. Numerical simulations are conducted to verify the efficacy of the proposed approach. DEWEY : 620.1 ISSN : 0733-9399 En ligne : http://ascelibrary.org/emo/resource/1/jenmdt/v137/i1/p22_s1?isAuthorized=no

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Semiactive connected control method for adjacent multidegree-of-freedom buildings / Richard E. Christenson in Journal of engineering mechanics, Vol. 133 N°3 (Mars 2007)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.290–298. Titre : Semiactive connected control method for adjacent multidegree-of-freedom buildings Type de document : texte imprimé Auteurs : Richard E. Christenson, Auteur ; B. F. Spencer, Auteur ; Johnson, Erik A., Auteur Année de publication : 2007 Article en page(s) : pp.290–298. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Buildings Structural control Seismic analysis Résumé : The connected control method (CCM) has been shown previously to be a viable means to protect adjacent flexible structures. The CCM works by using an auxiliary structure to provide a reaction force for control. The CCM can be applied to a variety of structural systems including civil, mechanical, or aerospace structures, and can incorporate various types of control strategies including passive, active, or semiactive control. This paper focuses on the application of the CCM to seismically excited adjacent buildings employing semiactive control and extends the previous research in semiactive coupled building control to examine the effects of relative building height and coupling link location on the semiactive performance. The optimal semiactive coupled building configuration is shown to follow two guidelines: (1) The dominant frequencies of the two coupled buildings do not coincide and (2) the coupling link is not placed at the node of a dominant vibratory mode. Additionally, it is shown that semiactive control is able to achieve performance similar to the optimal passive control at a fraction of the required control device force. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...] [article] Semiactive connected control method for adjacent multidegree-of-freedom buildings [texte imprimé] / Richard E. Christenson, Auteur ; B. F. Spencer, Auteur ; Johnson, Erik A., Auteur . - 2007 . - pp.290–298. Applied mechanics Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 133 N°3 (Mars 2007) . - pp.290–298. Mots-clés : Buildings Structural control Seismic analysis Résumé : The connected control method (CCM) has been shown previously to be a viable means to protect adjacent flexible structures. The CCM works by using an auxiliary structure to provide a reaction force for control. The CCM can be applied to a variety of structural systems including civil, mechanical, or aerospace structures, and can incorporate various types of control strategies including passive, active, or semiactive control. This paper focuses on the application of the CCM to seismically excited adjacent buildings employing semiactive control and extends the previous research in semiactive coupled building control to examine the effects of relative building height and coupling link location on the semiactive performance. The optimal semiactive coupled building configuration is shown to follow two guidelines: (1) The dominant frequencies of the two coupled buildings do not coincide and (2) the coupling link is not placed at the node of a dominant vibratory mode. Additionally, it is shown that semiactive control is able to achieve performance similar to the optimal passive control at a fraction of the required control device force. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%290733-9399%282007%29133%3A3%2829 [...]

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