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RE: Load Combinations for ASD 9th

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--- "Ritter, Mike" <mritter(--nospam--at)lgt.lg.com> wrote:
> My gripe is with the alternate ASD load combinations shown in the new
> IBC 2000...
> 
> 1,  D + L + (Lr or S or R)
> 
> 2.  D + L + (omega W)
> 
> 3.  D + L + (omega W) + S/2
> 
> 4.  D + L + S + (omega W)/2
> 
> 5.  D + L + S + E/1.4
> 
> 6.  0.9D + E/1.4
> 
> Am I the only one who sees something missing?  Where is the good old .9D
> + W?  Or, as in the basic load combinations, 0.6D + W?  I think this
> combination is very basic, and should be checked whether the code lists
> it or not.
> 
> Mike 
> 

I have a problem with this also.  LC 6 seems especially unconservative given
that it can be used in combination with a one-third stress increase, whereas
the "basic" load combinations cannot.  Would someone please explain this
dichotomy?

Keith Fix
Cromwell Architects Engineers

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