Moment Connections 2

[ToadJones]

Dumb question....no references around me presently....

Am I correct to assumed that endplate moment connections should have fully tensioned bolts?

 

[ToadJones]

Snug tight bolts don't work loose. They still have significant preload.
I guess, its the same thing that keeps your car/truck wheels from falling off!

 

[connectegr]

JAE
Without inspection, how do you know you are getting pretensioned bolts? I agree that Slip-Critical is not necessary. But, inspection should be required for all pretensioned bolts, if not all bolting in general (IMHO). Most iron workers do not know the specifics of slip resistance and faying surfaces. The process for installing slip-critical and/or pretensioned bolts is the same. And the method of installation should be inspected.

http://www.FerrellEngineering.com

 

[nutte]

csd,
No problem. The point about code reciting is a valid one. I prefer to keep it short and sweet on here. I leave the dissertations to others.

AISC Design Guide 4 discusses the research and testing of end-plate moment connections, going back to the 1950s.

http://www.aisc.org/store/p-1580-de...-endplate-moment-connections-seismic-and.aspx

 

[JAE]

connectegr - by AISC definition - pretensioned bolts mean "do everything you'd do for slip critical but without inspection". That was the definition a couple of years ago. Not sure if they've changed it recently.

 

[connectegr]

JAE
Per RCSC and AISC, the only difference between slip-critical and pretensioned is the required surface preparation for slip critical. Both require inspection per RCSC 9.2, dependent on the method of installation selected.

http://www.FerrellEngineering.com

 

[csd72]

You can use load indicating washers to aid in inspection.

 

[nutte]

JAE - I would disagree. "Slip critical" refers to more than just the bolt. It also deals with the faying surface of the material being joined. "Pretensioned bolt" has nothing to do with the faying surface.

 

[JAE]

connectegr - I stand corrected - It USED to be that a pretensioned connection was simply a slip critical connection without inspection (see either the silver or green AISC manual specification).

You are correct,I think, that the current spec just looks at the faying surface.

nutte - thanks - I meant to say connection, not bolt.