scholarly journals Application of the k-ω turbulence model to assess the flutter derivatives of a long span bridge

2011 ◽  
Author(s):  
F. Brusiani ◽  
G. Cazzoli ◽  
S. de Miranda ◽  
F. Ubertini ◽  
P. Vaona
Keyword(s):  
Turbulence Model ◽  
Long Span ◽  
Long Span Bridge ◽  
Derivatives Of ◽  
Flutter Derivatives

Flutter control of a streamlined box girder with active flaps

2020 ◽  
pp. 107754632093274
Author(s):  
Lingjun Zhuo ◽  
Haili Liao ◽  
Mingshui Li
Keyword(s):  
Control Algorithm ◽  
Suboptimal Control ◽  
Aerodynamic Stability ◽  
Box Girder ◽  
Identification Method ◽  
Long Span ◽  
Long Span Bridge ◽  
Bridge Girder ◽  
Interaction Simulation ◽  
Flutter Derivatives

Flutter control is necessary in the design of a long-span bridge. With the help of active flaps, flutter control can suppress flutter vibration and increase aerodynamic stability. This study aims to build a theoretical framework for active flutter control using a system consisting of a streamlined box girder with adjacently mounted active flaps (noted as a “deck–flap system”). An adaptive expression was proposed for the system’s self-excited forces, and an identification method was established for obtaining the system flutter derivatives in consideration of the bluff characteristics of the bridge deck and the aerodynamic interactions between the bridge girder and flaps. Then, the suboptimal control algorithm was implemented into the deck–flap system to simultaneously stabilize the divergent oscillation at the designed wind speed. Based on the proposed approach, numerical simulations were conducted to investigate the system flutter derivatives and the effectiveness of the control law. A comparison between the critical speeds of the two-dimensional flutter analysis and a fluid–structure interaction simulation showed a satisfactory performance from the theoretical model and the reliability of the identification method. The vibrations of the deck–flap system were successfully suppressed by the controlled motions of the active flaps under the application of the suboptimal control algorithm. This study provides a reliable framework for conducting an analysis of active control for bridge flutter and for significantly increasing the flutter stability of a deck–flap system.

scholarly journals Suppression of Bridge Flutter Using Suction Control

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Shibo Tao
Keyword(s):  
Wind Speed ◽  
Leeward Side ◽  
Suction Velocity ◽  
Long Span Bridges ◽  
Wind Speeds ◽  
Long Span ◽  
Suction Control ◽  
Long Span Bridge ◽  
Section Model ◽  
Derivatives Of

To verify the effectiveness of the suction-based method for improving flutter stability of long-span bridges, the forced vibration experiments for extracting the flutter derivatives of a section model with and without suction were performed, and the corresponding critical flutter wind speeds of this structure were calculated out. It is shown by the experiment that the flutter stability of the bridge depends on suction configuration. As the suction holes locate at the leeward side of the model, the critical flutter wind speed can attain maximum under the same suction velocity. In the analytical results, it is remarkably effective that the suction control improves the long-span bridge flutter stability.

Handling and Shipping of Long Span Bridge Beams

PCI Journal ◽  
1987 ◽  
Vol 32 (6) ◽  
pp. 86-101 ◽  
Author(s):  
George Laszlo ◽  
Richard R. Imper
Keyword(s):  
Long Span ◽  
Long Span Bridge ◽  
Bridge Beams
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