Wind Loads on vertical fins on buildings

[BCheck]

Anyone have guidance on how to apply wind loads on vertical building fins projecting off the building by several feet? Is WL applied to each individual fin and as Zone 4 (field), Zone 5 (corner) or parapet?

 

[phamENG]

Depending on the size of the fin, probably a parapet based on zone 5 positive and negative pressures.

 

[jjl317]

Depending on what this vertical fin looks like, one potential option might be using solid sign wind loading.

 

[phamENG]

A sketch would help, but off hand I don't think I'd use the sign procedure. It's a little too "clunky" for something like this. If you consider it as a parapet, you can run independent loads on it to determine its contribution to the MWFRS load and its isolated C&C loads for the various pieces. This will likely give you a better design that spreading the sign "F" evenly over the surface. Doing that also becomes problematic if it's projecting from the side of a multistory building as your qz would be based on the centroid elevation and could be well below the top, thereby underestimating the load in some areas and overestimating in others.