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Re: Near-Source Factor for non-structural components

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Ed,

Section 1629.4.2 is intended to reduce the penalty on the main LFRS of
simple structures.  In my opinion, it is not intended to reduce the
calculated demand on equipment and components, nor would this be applicable
under 1634, non-building structures.

If I were designing tank anchorage within 2 km of the San Andreas fault, I
would not consider reducing the calculated demand.


Paul Feather PE, SE
pfeather(--nospam--at)SE-Solutions.net
www.SE-Solutions.net
----- Original Message ----- 
From: "Ed Tornberg" <edt(--nospam--at)blazerind.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, November 14, 2003 2:57 PM
Subject: RE: Near-Source Factor for non-structural components


> Sorry, I didn't clearly state my question:
> Within 2 miles of a Type A source Na = 1.5
> But if the "structure" meets the requirements of 1629.4.2 you can use
> Na=1.1
> Sooo, for equipment forces derived by section 1632, do you base Na on
> what you use for the LFRS?  That is, if Na = 1.1 for the LFRS, that's
> what you use on equipment?
> Or is equipment excluded from the 1629.4.2 exceptions, because it's not
> a structure, so you're back to Na = 1.5?
> Or does it depend if the equipment is "above" the LFRS in the load path?
>
> Thanks,
> Ed
>
> -----Original Message-----
> From: Chris Roper [mailto:christophermroper(--nospam--at)hotmail.com]
> Sent: Friday, November 14, 2003 1:55 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Near-Source Factor for non-structural components
>
>
> In zone 4, Ca is determined as a function of Na so it would apply...
> regardless of whether you're calculating lateral forces for the main
> LRFS
> per 1630, elements and components per 1632 or non-building structures
> per
> 1634.  The Ca, Na, Cv & Nv parameters are defined by the soil supporting
> and
> transmitting seismic loads into the structure.  I think of it this way,
> the
> site doesn't know or care whether it's transmitting loads into a main
> LRFS,
> element or component, etc.
>
> Chris
>
>
> >From: "Ed Tornberg" <edt(--nospam--at)blazerind.com>
> >Reply-To: <seaint(--nospam--at)seaint.org>
> >To: <seaint(--nospam--at)seaint.org>
> >Subject: Near-Source Factor for non-structural components
> >Date: Fri, 14 Nov 2003 10:58:22 -0800
> >
> >Hey Cal-masters,
> >
> >Does UBC 1629.4.2 only allow "N sub a" to be 1.1 for main LRFS?  The
> >phrase says "structures", but is this assumed to apply to section 1632
> >stuff - equipment?
> >Gotta water tank in a building on the San Andreas fault.
> >
> >The blue book C104.4.3 last paragraph seems to indicate the 1.1 is
> >mainly dependant on conditions 1-5, in a way that is generally
> >attributable to the LRFS.
> >
> >TIA,
> >
> >
> >Ed Tornberg, PE
> >Blazer Industries, Inc.
> >
> >Aumsville, OR
> >503-749-1900
> >
> >
> >
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