Understanding wind load in CP3 part V

[Bogusbogedi]

Hello fellow engineers, I’m looking for guidance on how to use CP3 part V since it’s still in use in my country. I have a basic understanding of the steps, but I lack a proper understanding of how wind itself behaves. I have been met with a case of a canopy open on all 4sides that does not have obstruction beneath and my understanding is that wind when acting on this type of structure will cause an external pressure causing a downforce on the roof, yet my engineer told me that uplift will be critical. My understanding is that uplift may occur if I had obstruction beneath or had a wall on one side which may cause the wind to hit that obstruction and rise up to push against the roof.
Needing guidance on matters of wind load in different scenarios.

 

[BridgeSmith]

Depending on the particular directionality/path of the wind, which is near impossible to predict, you may get uplift or downforce at any given time. It would not be surprising to me that uplift (usually combined with lateral) would produce a critical load case.