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RE: Main Wind Force vs C&C Wind Force[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "seaint(--nospam--at)seaint.org" <seaint(--nospam--at)seaint.org>
- Subject: RE: Main Wind Force vs C&C Wind Force
- From: Richard Calvert <RichardC(--nospam--at)lbbe.com>
- Date: Tue, 6 Oct 2009 12:22:20 -0400
- Accept-language: en-US
- Acceptlanguage: en-US
I’m not a senior associate either, so my input may likely be worthless for your endeavor, but yes, you are correct – even further, the strength of studs doesn’t need to be evaluated for CC, but rather only deflection using 0.7*CC. (see the footnote deflection limits section/table of the IRC)
If CC in combined loading were required,
there would not be a single home in
I will say that EVERY engineer that I have worked with (I’m a specialty engineer, so that’s a fairly big number) has a different take on the split between CC and MWFRS – so good luck convincing him otherwise.
FYI – my take is that any ‘single members,’ or components and connections (any connections which will not behave as part of system – i.e. if that one connection fails the system will go flying –
For a closed structure generally anything which maintains the envelope of the structure from becoming a ‘partially open’ situation is CC – even this gets quirky when discussing the difference between say roof trusses and truss plates…
Take the case of a canopy. Roofing materials and ALL connections are designed to CC, the main members are MWFRS, only b/c even if they fail they will not create a projectile situation, so long as the connection holds.
But I’ve had engineers split hairs and say that there is a difference between a free standing canopy and one attached to a structure… not sure what sense that makes myself, but it goes to show the crazyness out there when it comes to wind loads…
A senior associate and myself are having a debate.
So please correct me if I am wrong:
Desinging a wall element for out of plane force (be it masonry, wood, etc.)
When checking the element for forces that are combine, (i.e. axial + wind) one should use the MWFRS forces. However that same element must then be checked for the C&C load, but that C&C load is not required to be in combination with any other loads.
If this is incorrect please let me know, also if anyone has a reference that would show an example of this I would be greatful.
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