Wind Loads on a flagpole??
Wind Loads on a flagpole??
(OP)
I do not see any reference to this in either AASHTO LTS-4, 2001 or ASCE-7, 98. Given F=0.00256*Kz*Kh*I*Cd*(V)^2*A, what would you use for the Cd? All other coefficients are easy to calculate. Is this the correct methodology?






RE: Wind Loads on a flagpole??
RE: Wind Loads on a flagpole??
C = 0.05 + [0.7 * m/(p*c) * (A/c^2)^-1.25]
Where:
- m is the unit mass of the flag (kg/m^2)
- q is the density of air (nominally 1.2 kg/m^3)
- c is the height of the flag (m) {Note this is not height above ground of flag but actual height of flag}
- A is the area of flag perpendicular to wind direction (m^2)
RE: Wind Loads on a flagpole??
Is A just the flag area? With the wind blow, the flag will be in the wind direction and vibrate.
RE: Wind Loads on a flagpole??
Cd is the drag coefficient for a cylinder; roughly 1.0 max for high wind speeds (> 100 mph), assuming a 6" diameter; and it won't change much at higher speeds or at diameters within .5x to 2x of that. Most good fluid dynamics textbooks will give a plot of the Cd of a cylinder for various Reynold's numbers.
RE: Wind Loads on a flagpole??
RE: Wind Loads on a flagpole??
RE: Wind Loads on a flagpole??