Downward and upward Components & Cladding roof wind pressures

[IngeIvan]

Hello,

Does anyone have any tips on how to apply roof wind pressures to a building in a gravity program i.e. RISA Floor? I just don't want to be overly conservative when applying components and cladding wind loads to joists and purlins, since I know that for girders, the trib area is way over 700 sq ft and MWFRS loads can be used.

Maybe if there was a way to classify the member and the load combination?

How do you guys handle this situation?

 

[jayrod12]

Run multiple load combos. One for the smaller members and one for the girder checks. Then adjust the load factors for the difference between C&C loads and MWFRS.

 

[humanengr]

Can you enter "line loads" in your program? If so, enter the area load based on C&C wind load,
then subtract the excess load on the main beams or girders with the line loads.