Abstract
The effect of two kinds of corner-cuttings on vortex-induced oscillation and galloping of three-dimensional square cylinders is investigated in uniform flow. The cross-wind response and vortex shedding frequency are measured on the models with corner-cutting ratios e/d = 0/60 to 20/60, and the mass-damping parameter δ = 0.20, 0.50, 0.75, together with the stationary over-turning moment measurement. As a result, it is found out that although the Strouhal number increases as the increase of coner-cutting ratio resulting in to lower the critical wind speed, the model cutted in right angle with the ratio e/d = 4/60 is most stable, because the vortex-shedding frequency is hardly locking-in until the wind speed becomes 30% higher than the critical. The Den-Hartog's criterion also suggests the adovantage of this particular type of corner cutting.
