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Re: Siesmic Bolts

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Commentary Section C7.2 of the AISC Provisions provides a good response to your
questions.  The fully-tensioned bolts are desired for seismic connections, and
will minimize slip and damage in moderate (smaller than code) seismic events.
However, the deformations associated with larger events will overcome the slip
and the bearing limit state must exceed the required strength for larger (code)
seismic events.

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

************************





"Arvind K. Bisarya" <arvind_bisarya(--nospam--at)mk.com> on 07/10/2000 11:20:43 AM

Please respond to seaint(--nospam--at)seaint.org

To:   "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
cc:

Subject:  ...no subject...


Can   someone  help  me  with  this  please ,   thanks  in  advance.

AISC, ASD Ninth Edition/LRFD 1St Edition, Volume II - Connections :

Referring to Specifications Section K which says: "The occurrence of full
design wind or earthquake loads is too infrequent to warrant consideration
in fatigue design.", goes on to say -(p 1-11) "Consequently, slip critical
connections are not normally required or used by engineers for wind or
seismic loads for buildings."

However - AISC's Seismic Provisions, dated April, 1997, section 7.2.a says:
 "Connections may use bearing values, but nevertheless - the faying
surfaces are to be a minimum of Class A friction condition."

This seems somewhat of a contradiction to me, but the requirements are
clearly stated.

Anyone having some insight into why AISC would require a friction capacity
faying surface for bolts intended to withhold their seismic load via
bearing - I would like to hear it.


Thankyou

Arvind  Bisarya
Phone  314  -  539  -  0471
Fax       314  -  539  -  8321
E - Mail       arvind_bisarya(--nospam--at)mk.com









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