Bottom Plate Slope Effects on Aerodynamic Behaviour of Hexagonal Cross-Section Bridge Deck

The number and span length of long-span bridges are increasing day by day to connect wider lands apart thus facilitating for the economic development of the region. As the span lengths of the bridges are increasing, their aerodynamic behaviour becomes more and more important. Under wind environment, both the static and dynamic behaviors of long-span bridges are of great interest. The shape of the deck is one of the most influential factors that control aerodynamic behavior of a long-span bridge. A pentagonal shaped bridge deck has an improved aerodynamic behavior and thus, this has been applied for a number of practical bridges. The advantage of using this type of deck is that this does not require additional devices like fairings. Flow on the top deck is controlled by placing a curb on the top deck each side, which is known as the Separation Interference Method (SIM), where flow on the bottom deck is controlled by the bottom plate web slope. In previous research, detailed investigations have been carried out on this kind of deck shape, which show their efficiency against aerodynamic instability of the bridge. In the current study, the authors carry out a detailed numerical investigation on the bottom plate web slope effect on flow behaviour of a hexagonal bridge deck, and the results are compared with a pentagonal bridge deck case. Along with the bottom plate web slope, the width of the bottom horizontal flange plate, and the side ratio are also altered to observe their influence on aerodynamic behavior. A two-dimensional finite volume code with RANS turbulence model is used in the present study. The result reveals that the optimum bottom plate web slope shifts to larger slope when the bridge deck is shaped as hexagon instead of pentagon.

Language

  • English

Media Info

  • Media Type: Web
  • Monograph Title: Wind Engineering for Natural Hazards: Modeling, Simulation, and Mitigation of Windstorm Impact on Critical Infrastructure
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01683214
  • Record Type: Publication
  • ISBN: 9780784415153
  • Files: TRIS, ASCE
  • Created Date: Oct 4 2018 3:01PM