Wind and Structures

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Effect of windshields on the aerodynamic performance of a four-box bridge deck

  • Received : 2019.10.18
  • Accepted : 2020.06.08
  • Published : 2020.07.25
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Abstract

A new type of bridge deck section consisting of four-box decks, two side decks for vehicular traffic lanes and two middle decks for railway traffic, has been experimentally investigated for determining its aerodynamic properties. The eight flutter derivatives were determined by the Iterative Least Squares (ILS) method for this new type of four-box deck model, with two windshields of 30 mm and 50 mm height respectively. Wind tunnel experiments were performed for angles of attack α = ±6°, ±4°, ±2° and 0° and Re numbers of 4.85×105 to 6.06×105 and it was found that the four-box deck with the 50 mm windshields had a better aerodynamic performance. Also, the results showed that the installation of the windshields reduced the values of the lift coefficient CL for the negative angles attack in the range of -6° to 0°, but the drag coefficient CD increased in the positive angle of attack range. However, galloping instability was not encountered for the tested reduced wind speeds, of up to 9.8. The aerodynamic force coefficients and the flutter derivatives for the four-box deck model were consistent with the results reported for the Messina triple-box bridge deck, but were different from those reported for the twin-box bridge decks.

Keywords

Acknowledgement

This research was supported through the NSERC Discovery grant number 145278 - 06776. Also the authors are grateful to Dr. Muslim for the advices and assistance when preparing the experiments, Dr. Bas Baskaran and Dr. Steve Ko, who lend some of the equipment needed for the experiment. Particularly the authors would like to acknowledge the support of Mr. Vicent Ferraro, Mr. Dave Menard and Mr. Ryan Rosborough from Gradient Wind Engineering, for modifying the experimental model and for making their wind tunnel available for this research project.

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