Documents disponibles écrits par cet auteur

Effectiveness of tuned mass dampers against ground motion pulses / Matta, Emiliano in Journal of structural engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 188–198 Titre : Effectiveness of tuned mass dampers against ground motion pulses Type de document : texte imprimé Auteurs : Matta, Emiliano, Auteur Année de publication : 2013 Article en page(s) : pp. 188–198 Note générale : structural engineering Langues : Anglais (eng) Mots-clés : earthquake  engineering;  tuned  mass  damper;  optimal  design;  near-field  earthquake;  ground  motion  pulse  model;  percentile  response  spectra Résumé : It is known that the effectiveness of tuned mass dampers (TMDs) decreases as the input duration shortens. As a result, their use is commonly discouraged against short-duration, pulse-like ground motions, such as those occurring in near-field (NF) zones in the presence of forward directivity or fling-step effects. Yet a systematic assessment of such control impairment is still missing. In this paper, a recent analytical model of ground motion pulses is applied to the design and evaluation of TMDs against impulsive earthquakes. Based on this model, first, a new optimization method is introduced as an alternative to the classical [Math Processing Error] approach. Then, the two strategies are tested on single- and multi- degrees-of-freedom linear structures subject both to analytical pulses and to a large set of NF records possessing pulse-like features. The resulting statistical evaluation, expressed by percentile response spectra, shows the pros and cons of a pulse-oriented TMD design and improves the general understanding of TMD performance under impulsive ground motions. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000629 [article] Effectiveness of tuned mass dampers against ground motion pulses [texte imprimé] / Matta, Emiliano, Auteur . - 2013 . - pp. 188–198. structural engineering Langues : Anglais (eng) in Journal of structural engineering > Vol. 139 N° 2 (Février 2013) . - pp. 188–198 Mots-clés : earthquake  engineering;  tuned  mass  damper;  optimal  design;  near-field  earthquake;  ground  motion  pulse  model;  percentile  response  spectra Résumé : It is known that the effectiveness of tuned mass dampers (TMDs) decreases as the input duration shortens. As a result, their use is commonly discouraged against short-duration, pulse-like ground motions, such as those occurring in near-field (NF) zones in the presence of forward directivity or fling-step effects. Yet a systematic assessment of such control impairment is still missing. In this paper, a recent analytical model of ground motion pulses is applied to the design and evaluation of TMDs against impulsive earthquakes. Based on this model, first, a new optimization method is introduced as an alternative to the classical [Math Processing Error] approach. Then, the two strategies are tested on single- and multi- degrees-of-freedom linear structures subject both to analytical pulses and to a large set of NF records possessing pulse-like features. The resulting statistical evaluation, expressed by percentile response spectra, shows the pros and cons of a pulse-oriented TMD design and improves the general understanding of TMD performance under impulsive ground motions. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29ST.1943-541X.0000629

A new passive rolling-pendulum vibration absorber using a non-axial-symmetrical guide to achieve bidirectional tuning / Matta, Emiliano in Earthquake engineering structural dynamics, Vol. 38 N° 15 (Décembre 2009) 

Public ISBD [article]  in Earthquake engineering structural dynamics > Vol. 38 N° 15 (Décembre 2009) . - pp. 1729-1750 Titre : A new passive rolling-pendulum vibration absorber using a non-axial-symmetrical guide to achieve bidirectional tuning Type de document : texte imprimé Auteurs : Matta, Emiliano, Auteur ; De Stefano, Alessandro, Auteur ; Spencer Jr, Billie F., Auteur Article en page(s) : pp. 1729-1750 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Passive  vibration  control;  Seismic  protection;  Rolling-pendulum  TMD;  Bidirectional  tuning;  Non-holonomic  mechanics;  Non-linearity Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A new, passive, vibroprotective device of the rolling-pendulum tuned mass damper type is presented that, relying on a proper three-dimensional guiding surface, can simultaneously control the response of the supporting structure in two mutually orthogonal horizontal directions. Unlike existing examples of ball vibration absorbers, mounted on spherical recesses and effective for axial-symmetrical structures, the new device is bidirectionally tuneable, by virtue of the optimum shape of the rolling cavity, to both fundamental structural modes, even when the corresponding natural frequencies are different, in such a case recurring to an innovative non-axial-symmetrical rolling guide. Based on Appell's non-holonomic mechanics, a non-linear dynamic model is first derived for the bidirectional absorber mounted on a 1-storey 3-degrees-of-freedom linear structure translating under the effect of both imparted base motion and applied dynamic forces. A laboratory-scaled prototype of the device is then tested to experimentally demonstrate the bidirectional tuning capability and to validate the mathematical model. The design procedure and the seismic performance of the absorber are finally exemplified through numerical simulation. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe [article] A new passive rolling-pendulum vibration absorber using a non-axial-symmetrical guide to achieve bidirectional tuning [texte imprimé] / Matta, Emiliano, Auteur ; De Stefano, Alessandro, Auteur ; Spencer Jr, Billie F., Auteur . - pp. 1729-1750. Génie Civil Langues : Anglais (eng) in Earthquake engineering structural dynamics > Vol. 38 N° 15 (Décembre 2009) . - pp. 1729-1750 Mots-clés : Passive  vibration  control;  Seismic  protection;  Rolling-pendulum  TMD;  Bidirectional  tuning;  Non-holonomic  mechanics;  Non-linearity Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : A new, passive, vibroprotective device of the rolling-pendulum tuned mass damper type is presented that, relying on a proper three-dimensional guiding surface, can simultaneously control the response of the supporting structure in two mutually orthogonal horizontal directions. Unlike existing examples of ball vibration absorbers, mounted on spherical recesses and effective for axial-symmetrical structures, the new device is bidirectionally tuneable, by virtue of the optimum shape of the rolling cavity, to both fundamental structural modes, even when the corresponding natural frequencies are different, in such a case recurring to an innovative non-axial-symmetrical rolling guide. Based on Appell's non-holonomic mechanics, a non-linear dynamic model is first derived for the bidirectional absorber mounted on a 1-storey 3-degrees-of-freedom linear structure translating under the effect of both imparted base motion and applied dynamic forces. A laboratory-scaled prototype of the device is then tested to experimentally demonstrate the bidirectional tuning capability and to validate the mathematical model. The design procedure and the seismic performance of the absorber are finally exemplified through numerical simulation. ISSN : 0098-8847 En ligne : www.interscience.wiley.com/journal/eqe