I am doing a design on an enclosed building with flat roof using the MWFRS of buildings of all heights( I have to use this method). I have all my wind loads but now Sec 27.4.6 (ASCE 7-10) states that I have to design my wind loads for load cases 1-4 on figure 27.4-8. My question is how are my wind forces applied to these 4 cases? How will I determine which case will govern and what about my Roof wind forces? Everything before this was pretty straightforward but now I have ran into a dead end. I would greatly appreciate assistance to move forward with this issue.
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