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Re: Equipment Anchorage

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Bill and David,

Don't know what ASHRAE is, and in response to David's comment, I've looked 
at that footnote "a" and don't think the intent is to allow you to check 
supporting members for non-amplified forces, (Ap=2.5). I just remember 
doing California hospital equipment anchorage under the '95/'98 CBC, 
checking/designing the support members didn't require the amplfied forces.

I think the only section of the ASCE 7-05 that might apply to not having to 
 check members for the amplified force is Sec. 13.4, 2nd paragraph , (page 
145), which states: "The component forces shall be those determined in 
Section 13.3.1, except that modifications to Fp and Rp due to anchorage 
conditions need not be considered."

Do you think this is what I am looking for to check existing framing 
members supporting the equipment using the non-amplified forces??

Thanks in advance,

Larry Hauer, S.E.

-----Original Message-----
> From: Bill Polhemus <bill(--nospam--at)>
> Sent: Nov 26, 2013 2:36 PM
> To: seaint-seaosc(--nospam--at)
> Subject: Re: [SEAINT-SEAOSC] Equipment Anchorage
> Just a thought. Are you sure that's not an ASHRAE provision?
> William L. Polhemus, Jr. P.E.
> 5
>> On Nov 26, 2013, at 4:15 PM, <lrhauer(--nospam--at)> 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 

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