AISC Slotted Holes Question

[dougantholz]

Does anyone know if there is a rule that states you cannot slot the hole in the beam and slot the hole in the support angle or plate? Both slots would be horizontal.
I have a construction fix question and it doesn't allow time for fabricating a new connection. Welding is also difficult in this case - and even if I did weld it I still need some bolts for erection purposes.

 

[csd72]

I dont know about the double slotted holes, but I do know that the required edge distance increases.

 

[Lion06]

read the last paragraph of J3.2 (it's on page 16.1-106). It allows a long slotted hole in only one of the connected parts at a given faying surface.
This requirement doesnt' apply to short slots or oversized holes. Additionally, if the long slot is on the outer ply you need to provide a plate washer or continuous bar with standard holes that will completely cover the slot.

 

[dougantholz]

Oh, and I did contact the solutions center but they haven't gotten back to me and I have a contractor breathing down my neck (of course).

 

[kslee1000]

If you have adequate edge distance (at the end of the member in both directions), I will make a very long slot hole in the outer member to allow for field fit over a mistake. After erection, you can weld stop bars to prevent connection slipage. A square washer is preferred in this case.

 

[nutte]

The AISC specification (J3.2, page 16.1-59 in the 3rd edition LRFD manual) says that you can use short-slotted holes in any or all plies of a bearing or slip critical connection.

As mentioned above, long-slotted holes are only allowed in one ply.