鋼管トラス構造塔体の風圧荷重(その2)特殊断面形鉄塔の場合

抄録

It is a general practice to use a square as the structure section towers. However, there are towers with sections of equilateral triangle, rectangle, hexagonal triangle and others, depending on the purpose of their construction.
Wind tunnel experimental data are scanty about the structure of the tower and neither the relationship is clear between the drag-coefficients and the projection ratios, which are essential for design.
We investigated the relationship between the drag-coefficients and the projection ratios with towers of special section as well as the variation of drag-coefficient with wind direction. We revealed the following facts: In the case of special sections (equilateral triangle, rectangle, hexagonal triangle), the relationship between the wind direction and the drag-coefficient fitted the result of a square section when the drag-coefficient was calculated considering the projection area. Even with towers of special sections, the relationship between the projection ratio and the drag-coefficient can obviously be discussed in terms of three zones just as with towers of a square section.