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# AERODYNAMIC SHAPE FACTORS for BEAMS

## AERODYNAMIC SHAPE FACTORS for BEAMS

(OP)
AS 1170.2 Tab E5 has drag force coefficients; Cf,x andCf,y; for UB/UC type sections for d/b ratios of 0.48 and 1.0.

Does anyone have similar data for other beam sections?
Is there a general formula for coefficients for varying d/b ratio?

The following seem to fit but there are only two points to work from.
Cf,x(θ=0deg)=2.5-0.9*(d/b)
Cf,y(θ=90deg)=-1.9*(d/b)
where  0.0<=(d/b)<=1.0

### RE: AERODYNAMIC SHAPE FACTORS for BEAMS

(OP)
Thanks apsix. Has anyone got something similar for beams of different aspect ratio?

### RE: AERODYNAMIC SHAPE FACTORS for BEAMS

(OP)
dik,
now I know where AS1170.2 gets its values from. Unfortunatley it adds no further information.

### RE: AERODYNAMIC SHAPE FACTORS for BEAMS

The information shown in the NBCC supplement that was attached was obtained from research done in Switzerland in the late 1940's, I understand.

Dik

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