[article] 
inJournal of structural engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 117-119

Titre :	Aerodynamic damping in the along-wind response of tall buildings
Type de document :	texte imprimé
Auteurs :	R. D. Gabbai, Auteur ; E. Simiu, Auteur
Année de publication :	2011
Article en page(s) :	pp. 117-119
Note générale :	Génie Civil
Langues :	Anglais (eng)
Mots-clés :	Aerodynamics Damping Building technology Flexible buildings Structural dynamics Wind forces
Index. décimale :	624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes
Résumé :	We present a novel methodology for the estimation of the aerodynamic damping that affects the along-wind response of tall buildings. The estimation uses (1) measurements of the external pressures on the windward and leeward faces under wind normal to a building face; (2) a simplified model of the relation between those pressures and the longitudinal fluctuating velocities with respect to the building; and (3) time-domain estimates of the along-wind building response that preserve the phase relationships between pressures and response. The methodology accounts explicitly for the shapes of the building’s modes of vibration, the natural frequencies of vibration, and the mechanical damping ratios, and takes advantage of the recent development of efficient time-domain algorithms for calculating dynamic structural response to wind. The methodology is applied to an isolated tall building in suburban terrain. The results of the calculations show that, for the example being considered, the aerodynamic damping (1) is positive, that is, it has a favorable effect; (2) is small relative to the mechanical damping; (3) is for practical purposes independent of the shape of the fundamental mode of vibration; and (4) is unaffected by higher vibration modes.
DEWEY :	624.17
ISSN :	0733-9445
En ligne :	http://ascelibrary.org/sto/resource/1/jsendh/v136/i1/p117_s1?isAuthorized=no

[article] Aerodynamic damping in the along-wind response of tall buildings [texte imprimé] / R. D. Gabbai, Auteur ; E. Simiu, Auteur . - 2011 . - pp. 117-119.
Génie Civil
Langues : Anglais (eng)
in Journal of structural engineering > Vol. 136 N° 1 (Janvier 2010) . - pp. 117-119

Mots-clés :	Aerodynamics Damping Building technology Flexible buildings Structural dynamics Wind forces
Index. décimale :	624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes
Résumé :	We present a novel methodology for the estimation of the aerodynamic damping that affects the along-wind response of tall buildings. The estimation uses (1) measurements of the external pressures on the windward and leeward faces under wind normal to a building face; (2) a simplified model of the relation between those pressures and the longitudinal fluctuating velocities with respect to the building; and (3) time-domain estimates of the along-wind building response that preserve the phase relationships between pressures and response. The methodology accounts explicitly for the shapes of the building’s modes of vibration, the natural frequencies of vibration, and the mechanical damping ratios, and takes advantage of the recent development of efficient time-domain algorithms for calculating dynamic structural response to wind. The methodology is applied to an isolated tall building in suburban terrain. The results of the calculations show that, for the example being considered, the aerodynamic damping (1) is positive, that is, it has a favorable effect; (2) is small relative to the mechanical damping; (3) is for practical purposes independent of the shape of the fundamental mode of vibration; and (4) is unaffected by higher vibration modes.
DEWEY :	624.17
ISSN :	0733-9445
En ligne :	http://ascelibrary.org/sto/resource/1/jsendh/v136/i1/p117_s1?isAuthorized=no