| Titre : | Time - domain aeroelastic loads and response of flexible bridges in gusty wind : prediction and experimental validation (2013) |
| Auteurs : | Bochao Cao, Auteur ; Partha P. Sarkar, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Journal of engineering mechanics (Vol. 139 N° 3, Mars 2013) |
| Article en page(s) : | pp.359–366. |
| Note générale : | Applied mechanics |
| Langues : | Anglais |
| Tags : | 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 |
