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RE: Mechanical and Electrical Seismic Loads

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I don’t understand your question.  If there is an exemption in the Code that says, “you don’t have to design for this,” then why don’t you take it?  There aren’t too many freebees in the Code – so I would suggest you use them when you can.  Use your own judgment to detail the connection so that there is *a* load path for overturning.  Code seismic forces are, at best, just good guesses anyways.


~~ Eli ~~


-----Original Message-----
From: Wesley Werner [mailto:wwerner(--nospam--at)]
Sent: Tuesday, February 28, 2006 6:08 AM
To: seaint(--nospam--at)
Subject: Mechanical and Electrical Seismic Loads



    I am wondering what is the best way to calculate seismic forces on M&E equipment in Seismic  Design Category B. According to ASCE 7-02 Section 9.6.1 mechanical and electrical units in this design category are exempt from the provisions of section 9.6 which deals with architectural, mechanical, and electrical components. I have a large condenser that is to be supported above the roof of the building. Should I treat it as a separate story and just calculate the forces as I would for the rest of the building? Or should I use section 9.6 even though ASCE says that M&E components are exempt for this Seismic Design Category?


Wesley C. Werner