This paper aims to study the aerodynamic behavior of bridges under skew wind by performing a series of section model tests and a numerical analysis. Two types of deck cross sections, with the width-to-depth (B/H) ratios of 5 and 10, were used in the test and the numerical analysis. The section model tests included measurements of the aerodynamic coefficients and flutter derivatives, the flutter critical wind speeds, and the buffeting responses. The effects of yaw angles were investigated both in the tests and the numerical analysis. The experimental results show that for the section model with B/H ratio of 5, the lowest flutter wind speed occurs at a negative angle of wind attack and a zero yaw angle. For the section model with B/H ratio of 10, the lowest flutter wind speed occurs at a negative angle of wind attack and a yaw angle of 20 degrees. These results also indicate that in the case of zero angle of wind attack, the flutter critical wind speeds increase with the yaw angles and the buffeting responses decrease as the yaw angles increase. To verify the applicability and validity of this analytical approach, an example is provided. Comparisons show that the calculated results obtained from this approach follow the same trend with the experimental results. The results obtained from the conventional method (mean wind decomposition) may not be applicable for large yaw angles.
Journal of Applied Science and Engineering=淡江理工學刊 15(4), pp.401-413