For the design of long span bridges, it is important to analyze the aerodynamic characteristics of the bridges, such as flutter, vortex-induced oscillation and buffecting phenomena.
In this study, an experimental study on the responses of 2-D plate sections is carried out. The aerodynamic instability of the girder sections is investigated for various cases with different shapes of the girder section, natural frequency ratios and angles of attack. The aerodynamic behaviors of double plate sections are also investigated. Dynamic behaviors related to wind speed, steady surface pressure and unsteady surface pressure are measured. It has been found that the aerodynamic stability of the plate section and double plate section is influenced by the ratio of the torsional and the heaving, the geometry of the section and the angle of attack. Especially, in the range of the natural frequency ratio greater than about 1.1, the increase of the natural frequency ratio improves aerodynamic stability.
