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RE: FW: 97 UBC

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What I mean is that the base shear equation is intended to be used for
strength design.  If you want to use allowable stress design, you divide the
base shear by 1.4.
In turn, it seems you should divide the prescribed minimum and maximum
diaphragm forces by 1.4


> -----Original Message-----
> From: Michael Valley [mailto:mtv(--nospam--at)skilling.com]
> Sent: Wednesday, September 29, 1999 10:40 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: FW: 97 UBC
> 
> 
> I'm not sure what you mean by "already factored by 1.4."
> 
> All of the loads in Chapter 16, Division IV (including Equation 30-4) 
> are intended to be used in strength-based design procedures.  As 
> explained in Section 1630.1, these strength-level earthquake loads 
> constitute E.
> 
> The 1.4 factor that I believe you are referring to comes into play 
> when you combine the strength-level earthquake loads, E, with other 
> loads for use with ASD procedures.  Such modification is defined in 
> Section 1612.3.
> 
> ************
> > From:          Al Grathwol <AGrathwol(--nospam--at)BoyleEngineering.com>
> > To:            "'SEAOC List'" <seaint(--nospam--at)seaint.org>
> > Subject:       FW: 97 UBC
> > Date:          Wed, 29 Sep 1999 12:44:41 -0400
> 
> > I haven't seen any response to this issue. Does anyone have 
> an opinion on
> > this?
> > 
> > > -----Original Message-----
> > > From: Al Grathwol 
> > > Sent: Tuesday, September 28, 1999 2:37 PM
> > > To: 'SEAOC List'
> > > Subject: 97 UBC
> > > 
> > > 
> > > Question: Are we to assume that the Fpx minimums and maximums 
> > > from Section 1633.2.9, note 2 for diaphragms are already 
> > > factored by 1.4, similar to the base shear eqn. 30-4?
> > > Thanks
> 
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> - - - - - -
> Michael Valley                                   E-mail: 
> mtv(--nospam--at)skilling.com
> Skilling Ward Magnusson Barkshire Inc.                  
> Tel:(206)292-1200
> 1301 Fifth Ave, #3200,  Seattle  WA 98101-2699          Fax:  
>       -1201
> 
>