Friday, March 13, 2009

Re: Frictin to Resist Seismic Forces

ASCE 7-05: 13.4.6 Friction Clips. Friction clips shall not be used for anchorage
attachment.
 
Farzin S. Rahbar, SE
David C. Weiss Structural Engineer & Associates, Inc.
(818) 227-8040 Ex. 13 Fax: (818) 227-8041
 
In a message dated 3/13/2009 10:47:35 A.M. Pacific Daylight Time, lrhauer@earthlink.net writes:
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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