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RE: C & C pressures, trusses

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Harold Sprague


I have not followed this from its beginning.  But the definition for C&C contained in the ASCE 7-05 Commentary may shed a little light.  Roof trusses are specifically cited as an example. 

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If the code says so, then have to comply: unless consider unconservative and willing to argue. But codes do change, and often need to. The commentary also basically supports what Christopher Banbury recommended.


And that principally is: both MWFRS and C&C pressures may need to be considered for the one element, within the appropriate context.



Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia