P. Omenzetter et al., Suppression of wind-induced instabilities of a long span bridge by a passive deck-flaps control system - Part I: Formulation, J WIND ENG, 87(1), 2000, pp. 61-79
Citations number
18
Categorie Soggetti
Mechanical Engineering
Journal title
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
A passive aerodynamic control method for suppression of the wind-induced in
stabilities of a very long-span bridge is presented. The control system con
sists of additional control flaps attached to the edges of the bridge deck.
Rotational motion of the control flaps is governed by prestressed springs
and additional cables connecting the flaps to an auxiliary transverse beam
supported by the main cables of the bridge. The rotational movement of the
flaps is used to modify the aerodynamic forces acting on the deck. as well
as to provide aerodynamic forces on the flaps, used to stabilize the bridge
. A time domain formulation of self-excited and buffeting forces is obtaine
d through the rational function approximation of the generalized Theodorsen
and Kusner functions, respectively. Performance indices assessing improvem
ent in critical wind speed and degree of stability of the system are propos
ed to find the optimal configuration of the deck-flaps system. This paper l
ays the theoretical groundwork for the one that follows. (C) 2000 Elsevier
Science Ltd. All rights reserved.