slotted holes connection question
slotted holes connection question
(OP)
i have an existing column.
i am a connecting new beam.
i need to slot the beam connecting to existing column for erection purposes.
other side of the beam is not slotted, connecting to new column.
if i am to use regular snug tightened condition for slotted holes.
can i ignore the fact that it's slotted and design the bolt and plate against bearing, shear, etc.. as if it were a regular hole.
simply put one end of the beam is slotted, other is not. can i design the bolt and shear plate as if there is no slot. or should i assume 2x shear for the non-slot.
thanks,
i am a connecting new beam.
i need to slot the beam connecting to existing column for erection purposes.
other side of the beam is not slotted, connecting to new column.
if i am to use regular snug tightened condition for slotted holes.
can i ignore the fact that it's slotted and design the bolt and plate against bearing, shear, etc.. as if it were a regular hole.
simply put one end of the beam is slotted, other is not. can i design the bolt and shear plate as if there is no slot. or should i assume 2x shear for the non-slot.
thanks,






RE: slotted holes connection question
Also, long-slots in an outer ply will require a plate washer.
http://www.FerrellEngineering.com
RE: slotted holes connection question
I wouldn't think it would matter what end of the beam the slots were on... or even if both ends were slotted.
RE: slotted holes connection question
should i use slip critical connection?
or snug tight is ok?
the thing is this has been there practice for sometime and no one seems to check on this.
thanks,
RE: slotted holes connection question
http://www.FerrellEngineering.com
RE: slotted holes connection question
http://www.FerrellEngineering.com
RE: slotted holes connection question
if i have 6 kip beam axial for W14 say 3 bolt rows, going to existing column.
can DTI washer be enough even if i use slotted holes?
are there any DTI slip capacity?
thanks,
RE: slotted holes connection question
6 kips is a relatively small axial load for structural steel. What is your material?
Your last post creates a little concern regarding your understanding of slip critical bolted connections.
http://www.FerrellEngineering.com
RE: slotted holes connection question
I know slip critical is not the bolt but the friction between sufaces.
What I'm saying is for 6 kip for slotted is it necessary to specify slip critical or DTI is OK?
Thanks,
RE: slotted holes connection question
http://www.FerrellEngineering.com
RE: slotted holes connection question
I believe you mean:
"The slip critical shear resistance of the bolt is NOT the same whether the slot is short, long, or oversized."
RE: slotted holes connection question
It is is our Steel Notes Drawing to use DTI for main field connectors. I have also confirmed this with the construction guy.
I still didnt get if this is ok or not for 6 kips?
Thanks,
RE: slotted holes connection question
I would still specify that the connections are to be slip critical. I understand your intent, but someone else may not. Especially when there is additional costs applied to the surface requirements. The simple understanding or DTI is that pretension of the bolts is required, only. Bolts can be pretensioned and still be considered bearing connections, such as in the use of tension control bolts. But, your condition requires slip-critical, so be clear.
If your final question is regarding the adequacy of a connection with 3 bolts for 6 kips axial. My simple answer is MAYBE. I would need to see the complete connection detail. What is the shear load? Plate thickness? 1 or 2 plates? Weld sizes? Bolt size and grade?
http://www.FerrellEngineering.com
RE: slotted holes connection question
the only concern i had was the slotted holes without using slip critical but dti.
i would just use round holes and not slotted. the problem though is construction group guy said if it doesnt fit during erection, they'll slot it in the field. ahahahah
i work inside a refinery plant doing small new structures connecting to existing.
anyway thanks.