Aerodynamic and aeroelastic characteristics of typical bridge decks equipped with wind barriers at the windward bridge-deck edge

0473548 - ÚTAM 2018 RIV GB eng J - Článek v odborném periodiku
Buljac, Andrija - Kozmar, H. - Pospíšil, Stanislav - Macháček, Michael
Aerodynamic and aeroelastic characteristics of typical bridge decks equipped with wind barriers at the windward bridge-deck edge.
Engineering Structures. Roč. 137, April (2017), s. 310-322. ISSN 0141-0296. E-ISSN 1873-7323
Grant CEP: GA ČR(CZ) GA15-01035S; GA MŠMT(CZ) LO1219
Klíčová slova: bridge decks * roadway wind barrier * aerodynamic forces and moments * galloping * flutter * wind-tunnel experiments
Obor OECD: Construction engineering, Municipal and structural engineering
Impakt faktor: 2.755, rok: 2017
http://www.sciencedirect.com/science/article/pii/S014102961730278X

The present wind-tunnel study focuses on the effects of roadway wind barriers on aerodynamic and aeroelastic characteristics of bridge decks characterized by various aerodynamic shapes of the cross section. Three bridge-deck sections are studied, i.e., streamlined, semi-bluff, and bluff sections. The standard 5 m high (full-scale) wind barrier with 30% porosity is placed at the windward (leading) edge of the bridge-deck sections. Aerodynamic forces and overturning moment are determined at various wind incidence angles. Galloping stability is studied using the quasi-steady theory. Flutter derivatives are determined to evaluate flutter sensitivity of the studied bridge-deck sections with the wind barrier in comparison with the empty bridge-deck sections. The experimental results indicate some important features. In particular, the drag force coefficient is increased for all bridge-deck sections when the wind barrier is in place. This feature is particularly exhibited for the streamlined bridge-deck section. The wind barrier alters the trends and values of the lift force coefficient, while the influence of the wind barrier on the pitch moment is particularly exhibited for positive wind incidence angles, which is characteristic for all bridge-deck sections. The wind barrier does not influence the galloping sensitivity of the studied bridge-deck sections, while it deteriorates their dynamic stability with respect to torsional flutter.
Trvalý link: http://hdl.handle.net/11104/0270684