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Re: Mechanical Equip. Support

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I agree with Larry that there is no structure, other than the concrete pad.
 If Ch. 15 is applicable in the plan check engineer's eyes, which
system/structure type would apply from Table 15.4-1?  The mech'l unit is
"designed" to resist inertial loads by the manufacturer.  All we do is
design the anchorage and support of that unit.  I would argue that Ch. 13
is appropriate, and not ch. 15.  Good luck.

On Wed, Nov 6, 2013 at 10:59 AM, Polhemus, William

> I gotta go with the plan checker on this one (SURPRISE!)
> I have always considered Chapter 15 as appropriate for outside,
> roof-mounted equipment.
> -----Original Message-----
> From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On
> Behalf Of lrhauer(--nospam--at) Sent: Wednesday, November 06, 2013 12:45
> PM
> To: seaint-seaosc(--nospam--at)
> Subject: [SEAINT-SEAOSC] Mechanical Equip. Support
> I am designing the anchorage and concrete pad for an HVAC unit weighing
> about 15 kips and is outside, (not part of a building). I normally design
> such per ASCE 7-05, Chapter 13, (non-structural components), using 
> Section 13.3 and the seismic coefficients of Table 13.6-1. However, the 
> plan check engineer is requiring it be designed per Chapter 15 as there 
> was an errata to the ASCE requiring non-structural components where the 
> weight of the component is greater than 25% of the structure, it be 
> designed per Chapter 15, (non-building structures). Obviously if the 

Truncated 740 characters in the previous message to save energy.

David Topete, SE

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