Abstract
The design method for the frame-structure as a tower was mainly subject to the drag-coefficient. However, when REYNOLDS number (Re) for a steel-pipe quickly changes from critical region to super-critical region, a large lift-coefficient occurs. As a steel-pipe-tower, which is the combination of columns, a large lift-coefficient occurs on the tower under the specified conditions.This paper is concerned with the magnitude of lift-coefficient for steel-pipe-towers. We tried several experiments which is used wind tunnel. Each experiment is composed of a set of two columns and four columns.We are interested in the following results:(1) From the fundamental experiment for the circular cylinders with four different diameters of column, the lift-coefficient is confirmed to increase corresponding to the decrease of the drag-coefficient as 3.5×105<Re<1.5×106.(2) In the cases of combinations of two columns and four columns, the lift-coefficients are confirmed to increase about 1/2 to 2/3 of the drag-coefficient in the wind directionθ=10° to 15°.(3) From a view point of steel-pipe-tower, a large lift-coefficients are confirmed to occur in the wind directionθ=10°to 15°.
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