Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Net negative wind pressure on MWFRS sloped roof? 1

Status
Not open for further replies.

reverbz

Structural
Joined
Aug 20, 2024
Messages
94
Location
US
Hey Guys,

When following chapter 28 for MWFRS I'm noticing I get net negative wind pressure on at least some sloped roofs (meaning more wind opposite direction than towards the building). Does that seem correct? Or is there something I'm not looking at correctly? As it is I'd only consider the walls.

The windward zone on the roof is giving me -.69 pressure coefficient and the leeward zone is giving me a -0.48 pressure coefficient meaning the wind would be pulling back towards the windward side?
 
Last edited:
Yes, that can happen with certain slopes. That is why the Code requires a minimum wind load on the projected area of the building.
 
I prefer chapter 27 where they have the specific alt load case with the smaller positive pressure on the windward side
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top