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RE: Vertical component of EQ in UBC97 and IBC2000

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Politics.  That is why you have to consider it for LRFD in the UBC and not
for ASD.  It didn't magically go away, the ASD factor of safety is not
higher or anything else.  As for the IBC, it must be considered in all cases
except for foundations.  I wish I knew why it could be neglected there.

Jake Watson, P.E.
Salt Lake City, UT

>  -----Original Message-----
> From: 	Ali Karimzadegan [mailto:karimzadegan(--nospam--at)] 
> Sent:	Sunday, November 07, 2004 5:33 AM
> To:	seaint(--nospam--at)
> Subject:	FW: Vertical component of EQ in UBC97 and IBC2000
> 	The vertical component of earthquake load as per UBC97 (1630.1.1)
> could be ignored for WSD method. What about the vertical load component as
> per IBC? I didn't see any item that permit to ignore this component in
> IBC. Does anybody know that could we neglect it or if it should be
> considered in all cases what is the reason that makes this difference in
> IBC w.r.t. UBC97?
> Regards,
> Ali Karimzadegan
> M.S. C.E.
> Shiraz - Iran 

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