風による角柱の振動不安定性に対する稜の寸法比の影響について

Abstract

In the previous paper, the aeroelastic galloping of the three-dimensional prisms having severalrectangular cross sections were investigated by use of the quasi-steady theory suggested by Novak.From these analytical results the galloping was found to be more unstable with the increase ofthe aspect ratios (the values divided the height by the front width of the prisms).In this paper, the quasi-steady theory studied by Novak is corrected and the revised quasi-steady theory which is applicable to a rigid body oscillating with a rocking mode is obtained.The application of the revised quasi-steady theory to the galloping instability of the three di-mensional prisms is investigated compared with the free oscillation experiments. The mainresult is that the validity of the revised quasi-steady theory is restricted to the prisms with largeaspect ratios in the high reduced wind velocity.