Aerodynamic simulation by CFD on flat box girder of super-long-span suspension bridge

Abstract

The aerodynamic behavior of two self-oscillating sections are predicted by nonlinear k− ε model. One is the parallel rectangular cross-section ( B/ D=15; 2 d= B′; B: total width; D: height; B′: single width; 2 d: space of the sections) and another is the flat box girder cross-section. The section has the special feature that the box girder is separated and the vertical and the horizontal stabilizers are installed. At first, in order to investigate the applicability of the numerical method, the calculated results of aerodynamic behavior were compared with the experimental data for the parallel rectangular cross-section such as the priority test. Secondly, the method was applied to the flat box girder cross-section, and the aerodynamic instability mechanism on the stabilizer was examined from the calculated results of the flow pattern and the unsteady pressure characteristics.