Abstract: Outdoor large-scale single-column billboards are wind-damage vulnerable structures. In order to optimize their wind pressure distribution and wind-induced effect under the most unfavorable wind direction angle, based on the aerodynamic principle, the wind load characteristics of the billboard structure are numerically calculated using FLUENT. The simulation was compared with the wind tunnel test results to verify the reliability of the numerical simulation. On this basis, six kinds of single-column three-sided billboard shape optimization schemes were designed based on different sagittal span ratios for comparative analysis. The results show that the maximum negative wind pressure of each panel appears at the side and the edge of the panel, and the absolute value is twice the maximum positive wind pressure value. Comparing with the shape optimized model, it is found that the convex shape has obvious advantages in reducing wind pressure compared with the concave shape. When the structural sagittal span ratio S/L=1/9, the maximum positive wind pressure and the maximum negative wind pressure are both about 1000 Pa. Compared with the plane billboard, the pressure and suction of the structure are more balanced, the structural extreme wind pressure is greatly reduced, which is the optimal working condition.

Key words: Aerodynamic optimization, single column billboard, wind reduction, numerical simulation, wind resistance, span ratio