Ceiling Wind Pressure in Partially Enclosed Building

[drewpe]

I am looking to find the wind pressure on drop ceiling for a car dealership where there are large rytek doors for cars to go in and out of. Due to the size of the doors, the building goes to partially enclosed from enclosed when the doors are open. I am not sure whether to use interior pressures or partially enclosed pressures due to the doors opening. If I use partially enclosed pressures do I use roof pressures?
Does anyone have any input or knowledge on what to use here?

Thanks.

 

[OldDawgNewTricks]

I am not sure whether to use interior pressures or partially enclosed pressures due to the doors opening

It isn't "or". It should be internal pressures with partially enclosed classification.

If I use partially enclosed pressures do I use roof pressures?

No. External roof pressures typically would not be applied to a drop ceiling unless it is rigidly connected to the roof so they act together.

 

[le99]

As can be seen in the above illustrations, the net design pressure on the roof is the sum of the uplift on the exterior surface and the uplift on the interior surface from any internal pressure. Given your case, IMO, the use of the internal uplift pressure could be justified.