SLIP CRITICAL CONNECTION 1

[spike]

Is is possible to obtain a slip critical bolted connection when stainless steel shapes are used? I do not believe this is permissible in the AISC specs.

 

[dik]

Another WAG... (Wild Guess)... If the material hardness and surface roughness was simlar to regular steel, I would think that slip critical would be comparable (depends on the meaning of 'critical')... with a fall back into a regular bearing type of connection... you might want to increase the load factor a bit... and if it slips a tad, it will likely only slip the once unless you have very high stress reversals.

Dik

 

[SlideRuleEra]

For shapes made from the common grades of stainless steel, such as 304 or 316, a slip-critical connection is probably what will occur, even if you did not want it. When stainless members are in direct contact with each other they tend to "gall". This usually occurs with stainless steel fasteners, such as nuts & bolts. I have seen this happen; it absolutely ruins the threads & "welds" the nut to the bolt. Structural shapes that are in contact with each other probably expeience a similar fate. Here is a link that explains galling

http://www.assda.asn.au/asp/index.asp?pgid=18732

There is an Engineering-Tips Forum on "stainless steel for engineers" perhaps you could get more input there.

http://www.SlideRuleEra.net

 

[Lutfi]

Some of my thoughts that I come up with as I try to put myself to sleep.

What will happen if slip critical joint slips? (In old school, we used to call them Friction connections).

The joint will go in bearing. Am I right? The bearing joint will have higher capacity!

Who monitors slip critical joints to ensure that they do not slip?

I always wondered about this. I know we have conditions such as do not paint joint surfaces, tighten bolts to XX% of their tensile capacity, etc.....

Regards,


Regards,
Lutfi