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RE: IBC Question

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You are not allowed to use a 1.33 ASD increase with the basic combinations
where you are with the alternative load combinations.  This does not help
with anything other than working stress design of masonry.  You can still use
a 1.6 load duration factor for wood connections.  Where you get reamed with
the basic combinations is wind - a 1.3 increase is required on your wind
loads and the wind chapter says you can only use 2/3 of the dead load to
resist uplift / overturning.

-----Original Message-----
From: Jason Christensen [mailto:jason.christensen(--nospam--at)es2eng.com] 
Sent: Friday, June 17, 2005 10:38 AM
To: seaint(--nospam--at)seaint.org
Subject: IBC Question

Does anyone know why there is such a difference in dead load factors between
the IBC ASD Basic load combo Eq. 16-12 (0.6D + 0.7E) and the IBC Alternate
ASD load combo Eq. 16.18 (0.9D + E/1.4)?

Jason
 


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