Comparative and sensitivity study of flutter derivatives of selected bridge deck sections, Part 2: Implications on the aerodynamic stability of long-span bridges

2009 ◽  
Vol 31 (9) ◽  
pp. 2194-2202 ◽  
Author(s):  
Luca Caracoglia ◽  
Partha P. Sarkar ◽  
Frederick L. Haan ◽  
Hiroshi Sato ◽  
Jun Murakoshi
Keyword(s):  
Bridge Deck ◽  
Sensitivity Study ◽  
Aerodynamic Stability ◽  
Long Span Bridges ◽  
Long Span ◽  
Derivatives Of ◽  
Flutter Derivatives

Effect of Turbulence on the Aerodynamic Stability of Long Span Bridges

2013 ◽  
Vol 639-640 ◽  
pp. 452-455 ◽  
Author(s):  
Chun Guang Li ◽  
Zheng Qing Chen ◽  
Zhi Tian Zhang
Keyword(s):  
Wind Tunnel Test ◽  
Grid Turbulence ◽  
Aerodynamic Stability ◽  
Rectangular Section ◽  
Long Span Bridges ◽  
Long Span ◽  
Turbulence Flow ◽  
Turbulence Effect ◽  
Suspended Bridge ◽  
Derivatives Of

The study deals with the problem of turbulence effect on the instability of a long span suspended bridge. Wind tunnel test of three representative section models have been carried out in four type of passive grid turbulence flow to clarify the effect of turbulence intensity and turbulence scales. It was found that the turbulence has little effect on the derivatives of those streamlined deck sections, while it exhibits significant stabilizing effect on the bluff rectangular section prism. The loss of spanwise correlation may not be the main reasons induce the change of flutter stability in turbulence.

Comparative and sensitivity study of flutter derivatives of selected bridge deck sections, Part 1: Analysis of inter-laboratory experimental data

2009 ◽  
Vol 31 (1) ◽  
pp. 158-169 ◽  
Author(s):  
Partha P. Sarkar ◽  
Luca Caracoglia ◽  
Frederick L. Haan ◽  
Hiroshi Sato ◽  
Jun Murakoshi
Keyword(s):  
Experimental Data ◽  
Bridge Deck ◽  
Sensitivity Study ◽  
Derivatives Of ◽  
Flutter Derivatives

scholarly journals Ensuring the aerodynamic stability of the long-span bridges through studies in the wind tunnel

2018 ◽  
Vol 245 ◽  
pp. 02001 ◽  
Author(s):  
Evgenii Khrapunov ◽  
Sergei Solovev
Keyword(s):  
Wind Tunnel ◽  
Design Process ◽  
Aerodynamic Characteristics ◽  
Elastic Instability ◽  
Experimental Facility ◽  
Bridge Design ◽  
Aerodynamic Stability ◽  
Long Span Bridges ◽  
Long Span ◽  
Main Ideas

The main ideas of the aerodynamic studies of large bridges are presented in present paper. Main types of aero-elastic instability for bridges with spans over 100 meters are considered. A two-step modeling approach is presented. At the first stage, the aerodynamic characteristics of the span fragment are considered, at the second.stage the characteristics of the whole bridge. Methods for investigation of bridge oscillations in a special-purpose experimental facility – the Landscape Wind Tunnel – are described. Examples of tests with elastic similar models of bridges are given, and measurements to mitigate dangerous oscillations early in the bridge design process are described.

MEASUREMENTS OF FLUTTER DERIVATIVES OF A BRIDGE DECK SECTIONAL MODEL

2015 ◽  
Vol 20 (4) ◽  
pp. 107-116
Author(s):  
Leonardo Gunawan ◽  
Hadyan Hafizh ◽  
Hari Muhammad
Keyword(s):  
Bridge Deck ◽  
Sectional Model ◽  
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.

DETERMINATION OF FLUTTER DERIVATIVES OF BRIDGE DECKS BY COVARIANCE-DRIVEN STOCHASTIC SUBSPACE IDENTIFICATION

2011 ◽  
Vol 11 (01) ◽  
pp. 73-99 ◽  
Author(s):  
THARACH JANESUPASAEREE ◽  
VIROTE BOONYAPINYO
Keyword(s):  
Wind Tunnel ◽  
Thin Plate ◽  
Bridge Deck ◽  
Bridge Decks ◽  
Subspace Identification ◽  
Plate Model ◽  
Wind Tunnel Tests ◽  
Stochastic Subspace Identification ◽  
Derivatives Of ◽  
Flutter Derivatives

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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