Suppression of wind-induced instabilities of a long span bridge by a passive deck–flaps control system: Part I: Formulation
✍ Scribed by P. Omenzetter; K. Wilde; Y. Fujino
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 277 KB
- Volume
- 87
- Category
- Article
- ISSN
- 0167-6105
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✦ Synopsis
A passive aerodynamic control method for suppression of the wind-induced instabilities of a very long-span bridge is presented. The control system consists of additional control ¯aps attached to the edges of the bridge deck. Rotational motion of the control ¯aps is governed by prestressed springs and additional cables connecting the ¯aps to an auxiliary transverse beam supported by the main cables of the bridge. The rotational movement of the ¯aps is used to modify the aerodynamic forces acting on the deck, as well as to provide aerodynamic forces on the ¯aps, used to stabilize the bridge. A time domain formulation of self-excited and bueting forces is obtained through the rational function approximation of the generalized Theodorsen and KuÈ sner functions, respectively. Performance indices assessing improvement in critical wind speed and degree of stability of the system are proposed to ®nd the optimal con®guration of the deck±¯aps system. This paper lays the theoretical groundwork for the one that follows.