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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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