Time - domain aeroelastic loads and response of flexible bridges in gusty wind / Bochao Cao in Journal of engineering mechanics, Vol. 139 N° 3 (Mars 2013)  

Public ISBD [article]  inJournal of engineering mechanics > Vol. 139 N° 3 (Mars 2013) . - pp.359–366. Titre : Time - domain aeroelastic loads and response of flexible bridges in gusty wind : prediction and experimental validation Type de document : texte imprimé Auteurs : Bochao Cao, Auteur ; Partha P. Sarkar, Auteur Année de publication : 2013 Article en page(s) : pp.359–366. Note générale : Applied mechanics Langues : Anglais (eng) Mots-clés : Long-span bridges Time-domain formulation Rational functions Buffeting indicial Aeroelastic load prediction Gusty wind Résumé : Flexible bridges could experience vortex-induced and buffeting excitations below their design wind speeds and divergent self-excited oscillations (flutter) beyond a critical wind speed. For regular straight-line winds that are stationary or weakly stationary, a frequency domain formulation is routinely used for flutter analysis of bridges. However, when evaluating performance of flexible bridges subjected to gusty winds that are transient in nature, the frequency-domain formulation is not applicable, and hence time-domain methods should be used. In this paper, time-domain formulations were used to predict aeroelastic loads acting on a rigid bridge deck section model subject to stationary and gusty straight-line winds based on the knowledge of upstream wind speed and model displacement measurements. In this procedure, rational functions and indicial functions are used to formulate self-excited forces and buffeting forces, respectively. The functions used here were recently obtained from wind tunnel tests performed on a streamlined bridge deck section model with a smaller geometric scale. The results of the validation using a larger section model of this bridge deck subject to a ramp-type gust are presented here. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000502 [article] Time - domain aeroelastic loads and response of flexible bridges in gusty wind : prediction and experimental validation [texte imprimé] / Bochao Cao, Auteur ; Partha P. Sarkar, Auteur . - 2013 . - pp.359–366. Applied mechanics Langues : Anglais (eng) in Journal of engineering mechanics > Vol. 139 N° 3 (Mars 2013) . - pp.359–366. Mots-clés : Long-span bridges Time-domain formulation Rational functions Buffeting indicial Aeroelastic load prediction Gusty wind Résumé : Flexible bridges could experience vortex-induced and buffeting excitations below their design wind speeds and divergent self-excited oscillations (flutter) beyond a critical wind speed. For regular straight-line winds that are stationary or weakly stationary, a frequency domain formulation is routinely used for flutter analysis of bridges. However, when evaluating performance of flexible bridges subjected to gusty winds that are transient in nature, the frequency-domain formulation is not applicable, and hence time-domain methods should be used. In this paper, time-domain formulations were used to predict aeroelastic loads acting on a rigid bridge deck section model subject to stationary and gusty straight-line winds based on the knowledge of upstream wind speed and model displacement measurements. In this procedure, rational functions and indicial functions are used to formulate self-excited forces and buffeting forces, respectively. The functions used here were recently obtained from wind tunnel tests performed on a streamlined bridge deck section model with a smaller geometric scale. The results of the validation using a larger section model of this bridge deck subject to a ramp-type gust are presented here. ISSN : 0733-9399 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29EM.1943-7889.0000502

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