Wind load on round column cladding

[JStructsteel]

Got some precast panels around a wide flange beam. 3'-6" diameter. I am unsure how to apply the wind load, I was going to use the trib. circumference to be conservative. Any other thoughts, about a 22' tall column. precast broken up into 8' long sections at the tallest.

 

[MotorCity]

I would not apply the wind load on the full circumference of the column. The wind does not blow simultaneously in a 360 degree pattern. I would simply apply the wind load on the width (diameter) of the column in two orthogonal directions (not simultaneously). In the piping and petrochemical industry, its common to apply the wind load to 70% of the pipe diameter, owing to the fact that the curved "edges" of the pipe really are not able to capture the full brunt of the wind load. You could apply that same logic to your round column.

 

[WinelandV]

MotorCity - I don't have my copy of Wind Loads in Petrochem Facilities with me, but I don't recall seeing anything about only using 70% of the diameter.

JSturct - For this, you can pretty much use Chapters 26 and 29 from ASCE 7-16. You'll need to use the right kd factor (looks like it's 1.0 for round "Chimneys, Tanks, and Similar Structures" in the ASCE7-16). Then you need to use Chapter 29 for the general idea: qz*G*Cf*A, where A is the projected area. In the Petrochem Facility book, it says to use a Cf of 0.8 for piping (maybe this is what you had in mind, MotorCity). Looks like you've got an h/D of 6.3, so that 0.8 should be correct for your situation - but you can go more in depth in Figure 29.4-1.

 

[JStructsteel]

Thanks. I will be conservative too, I think the connections will have plenty of capacity.