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RE: Frictin to Resist Seismic Forces

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ASCE 7-05 Section 13.4, second paragraph...

"Component attachments shall be bolted, welded, or otherwise positively fastened without consideration of frictional resistance produced by the effects of gravity."

Section 13.6 (Mechanical and Electrical Components) states that attachments shall meet the requirements of Section 13.4.  I think that is what you are looking for.


Doug Mayer, SE

-----Original Message-----
From: lrhauer(--nospam--at) [mailto:lrhauer(--nospam--at)] 
Sent: Friday, March 13, 2009 10:45 AM
Subject: Frictin to Resist Seismic Forces

I am hoping that someone can reference the IBC, CBC, or ASCE section that disallows using friction as a means of resisting seismic forces, (Seismc Design Category "E"). I am responsible for designing anchorage of equipment to existing concrete pads and the supplier of the equipment is from Texas where, I guess, it is common to use a friction type "clamp" to secure the equipment rail to the concrete surface. At least that is what their drawings show. I want to tell them we need a "positive" connection- i.e. anchor bolts through the rails.

Thanks in advance,

Larry Hauer S.E.

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