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Re: Equipment Anchorage

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Are you looking for footnote a to Table 13.5-1 of ASCE 7-05?  I do recall
what you are referring to, but I can't locate it at the moment.  I think I
saw it recently in some seminar notes.

On Tue, Nov 26, 2013 at 2:15 PM, <lrhauer(--nospam--at)earthlink.net> wrote:

> I am designing the support of some roof top mounted mechanical equipment,
> (on an existing roof), that is supported by vibration isolators and,
> therefore, I have to amplify the seismic horizontal forces by 2.5, (Table
> 13.6-1 of the ASCE 7-05). These amplified forces would be used for the
> equipment anchorage to the platform and the platform to the roof framing.
> But, I somehow remember that in checking the existing roof framing the Ap
> can be reduced down to 1.0 from 2.5- it is only the connections that need
> to have the Ap of 2.5 used. But, I can’t seem to find this exception
> anywhere in the ASCE, (or ’10 CBC).
> 
> Can anyone help?
> 
> Thanks in advance,
> 
> Larry Hauer, S.E.

--
David Topete, SE

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