Numerical simulations and experimental validations of force coefficients and flutter derivatives of a bridge deck

In this paper, the covariance-driven stochastic subspace identification technique (SSI-COV) was presented to extract the flutter derivatives of bridge decks from the buffeting test results. An advantage of this method is that it considers the buffeting forces and responses as inputs rather than as noises. Numerical simulations and wind tunnel tests of a streamlined thin plate model conducted under smooth flows by the free decay and the buffeting tests were used to validate the applicability of the SSI-COV method. Then, the wind tunnel tests of a two-edge girder blunt type of industrial-ring-road (IRR) bridge deck were conducted under smooth and turbulence flows. The flutter derivatives of the thin plate model identified by the SSI-COV technique agree well with those obtained theoretically. The results obtained for the thin plate and the IRR bridge deck are used to validate the reliability and applicability of the SSI-COV technique to various wind tunnel tests and conditions of wind flows. The results also show that for the blunt-type IRR bridge deck, the turbulence wind will delay the onset of flutter, compared with the smooth wind.

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Wind Tunnel Test Investigation on Sectional Models of Chaotianmen Yangtze River Bridge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.201-203.2763 ◽

2011 ◽

Vol 201-203 ◽

pp. 2763-2766

Author(s):

Cheng Qi Wang ◽

Zheng Liang Li ◽

Zhi Tao Yan

Keyword(s):

Wind Tunnel ◽

Yangtze River ◽

Bridge Deck ◽

Wind Tunnel Test ◽

Wind Tunnel Tests ◽

Force Coefficients ◽

Test Investigation ◽

Flutter Derivatives

By means of wind tunnel tests on the sectional models of Chaotianmen Yangtze River Bridge, some important results are obtained, including the aerostatic force coefficients with the changing of attack angles, and eight flutter derivatives for the bridge deck. The wind-resistant behavior of the bridge is evaluated.

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The effects of fairings and of turbulence on the flutter derivatives of a notably unstable bridge deck

Journal of Wind Engineering and Industrial Aerodynamics ◽

10.1016/0167-6105(88)90172-9 ◽

1988 ◽

Vol 29 (1-3) ◽

pp. 339-349 ◽

Cited By ~ 7

Author(s):

Dryver R. Huston ◽

Harold R. Bosch ◽

Robert H. Scanlan

Keyword(s):

Bridge Deck ◽

Derivatives Of ◽

Flutter Derivatives

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Flutter Analysis Using Quasi-Steady Time-Domain Flutter Derivatives

IABSE Congress, New York, New York 2019: The Evolving Metropolis ◽

10.2749/newyork.2019.2664 ◽

2019 ◽

Author(s):

Sébastien Maheux ◽

Sébastien Langlois ◽

Frédéric Légeron

Keyword(s):

Time Domain ◽

Forced Vibration ◽

Bridge Deck ◽

Domain Model ◽

Vibration Tests ◽

The Time Domain ◽

Development And Validation ◽

Derivatives Of ◽

Great Belt ◽

Flutter Derivatives

<p>To be able to perform nonlinear flutter analyses for bridges, time‐domain approaches should be used instead of Scanlan’s formulation of self‐excited forces. Thus, this paper addresses the development and validation of a modified quasi‐steady time‐domain model similar to Scanlan’s approach that is based on the velocity and acceleration of the bridge deck. In this formulation, quasi‐steady time‐domain flutter derivatives measured in the wind tunnel through forced‐vibration tests at absolute constant velocity and acceleration are used. For this, a unique test rig, which can be used either for free‐ or forced‐vibration tests, was utilized. By measuring the time‐domain flutter derivatives of the Great Belt Bridge, their nondimensionalization with respect to the bridge‐deck width, velocity and acceleration of the deck is validated. Then, time‐domain flutter analyses are performed using this new model. They agree with the experimental critical speed and the prediction using Scanlan’s model.</p>

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