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Open Building w/ Roof > 45deg

Open Building w/ Roof > 45deg

Open Building w/ Roof > 45deg

(OP)
Hello everyone,

I'm working on a pavilion with a 20:12 hip roof slope - super steep, super stupid (for Orlando, FL), but I digress. ASCE7-10 only has charts up to 45deg pitches. I have found nothing explaining what to do if you have a slope steeper than 45deg. Anyone have any suggestions or could point me in the right direction????? Thanks!

Also, mostly talking about MWFRS, but C&C info is also needed.

RE: Open Building w/ Roof > 45deg

We've all been there.
Check Figure 27.4-1 at the bottom. For roof slopes greater than 80%, use Cp equals to .8. I think it used to just say use wall pressures, but this is a little more accurate.

RE: Open Building w/ Roof > 45deg

(OP)
Thanks for responding so quickly Jed! However, that's for enclosed/partially enclosed buildings. I have a purely open building, and 20:12 = 59deg.
After speaking with some coworkers here, we have discussed just using solid wall pressures.

RE: Open Building w/ Roof > 45deg

Pavilion = 4x Open posts (no wall) below the very steep, 4-sided sloped roof?

RE: Open Building w/ Roof > 45deg

I ran into this with an old school A frame house that looked like something out of a disney movie. The eaves of the house came down to about 2' above grade so I had to analyze it somewhere between a wall and a roof. I ran calcs for both MWFRS and C&C but to be conservative since I couldn't find any references I used C&C pressures throughout.

RE: Open Building w/ Roof > 45deg

You can treat the projected roof area as a sign or as a wall. Otherwise use Cp=1.0

RE: Open Building w/ Roof > 45deg

(OP)
Thank you all for your help. Much appreciated!!

We have designed this using solid wall/sign pressures. It's definitely a lot more conservative than using the Cp = 0.8, which is good.
Now, we just need to figure out how to report the pressures on drawings for the C&C zones. Any suggestions?

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