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Delay correlation of mechanical hysteresis and damping / Eugenio Gutierrez in Journal of structural engineering, Vol. 136 N° 1 (Janvier 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 76-85 Titre : Delay correlation of mechanical hysteresis and damping Type de document : texte imprimé Auteurs : Eugenio Gutierrez, Auteur ; Carlo Paulotto, Auteur Année de publication : 2011 Article en page(s) : pp. 76-85 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Damping  Delay  Correlation  Hysteresis  Frequency-ratio  Transients Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a procedure for calculating the effective equivalent structural properties (stiffness and damping) of hysteretic systems from the time histories of their dynamic response. The method is based on the finding that the effective dynamic damping is proportional to the product of the structural natural frequency and the delay between the overall restoring force and the structural displacement. The delay is calculated from the time-shifted cross correlation between the structural force and displacement; and the same procedure also allows us to compute the instantaneous period of the response. It is then shown how, by computing the standard deviations of the force and displacement signals, it is possible to compute both the equivalent damping and the linearized stiffness. By implementing this procedure sequentially through moving windows, it is possible to monitor the nonlinear evolution in time. Some proofs are given for some easily tractable mathematical cases such as for linear simple harmonic and seismic responses, conjecturing that the method can be equally applied for transient forcing functions of nonlinear systems. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i1/p76_s1?isAuthorized=no [article] Delay correlation of mechanical hysteresis and damping [texte imprimé] / Eugenio Gutierrez, Auteur ; Carlo Paulotto, Auteur . - 2011 . - pp. 76-85. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 76-85 Mots-clés : Damping  Delay  Correlation  Hysteresis  Frequency-ratio  Transients Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents a procedure for calculating the effective equivalent structural properties (stiffness and damping) of hysteretic systems from the time histories of their dynamic response. The method is based on the finding that the effective dynamic damping is proportional to the product of the structural natural frequency and the delay between the overall restoring force and the structural displacement. The delay is calculated from the time-shifted cross correlation between the structural force and displacement; and the same procedure also allows us to compute the instantaneous period of the response. It is then shown how, by computing the standard deviations of the force and displacement signals, it is possible to compute both the equivalent damping and the linearized stiffness. By implementing this procedure sequentially through moving windows, it is possible to monitor the nonlinear evolution in time. Some proofs are given for some easily tractable mathematical cases such as for linear simple harmonic and seismic responses, conjecturing that the method can be equally applied for transient forcing functions of nonlinear systems. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i1/p76_s1?isAuthorized=no