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Positive internal pressure generally means towards to surface. I get that point. Let me clear about my confusion. For Leeward Side, Ext. Pre.= qh G Cp= 29.5 X 0.85 X (-0.5)= -12.5 Int. Pre.= qh CGpi= 29.5 X (-0.18)= -5.31 (When CGpi is -) = 29.5 X (+0.18)= +5.31 (When CGpi is...

You can see the attachment.https://files.engineering.com/getfile.aspx?folder=b321bc6a-70a4-4190-823d-8ac8b9fa24d4&file=Capture.PNG

In case of windward pressure, +CGpi value is used. And in case of Leeward side, -CGpi value is used. I didn'i get the point.

The wind loads I calculate manually don't match with ETABS analysis. I think errors might be done in hand calculation. I need a complete workout example (for flat roof).

Hi, everyone. I have manually calculated Wind Loads according to ASCE 7-05. I have also run a ETABS model to verify the wind loads I have calculated. But I can't intrepid the ETABS results. Help me, please.