Designation of Bolted Connections...
Designation of Bolted Connections...
(OP)
When drawing slip critical, direct tension or other bolted connections that would require other than a snug tight condition, how are these connections designated on prints?






RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
csd
RE: Designation of Bolted Connections...
- All bolts to be tensioned as per ... unless noted otherwise
RE: Designation of Bolted Connections...
Construction workers are notorious for not reading the notes. If the only place you call out a connection type is in notes it may get missed. True, just because you call out a 3/4" A325 SC bolt doesn't mean the guy reading the drawing will know what that means but at least you didn't bury the information in note 12 on the cover sheet with 57 other notes.
RE: Designation of Bolted Connections...
I prefer to use 3/4" dia. type N A325 uno. If I require SC, use TC bolts. They are easy for you, your inspector and the iron workers to check in the field. If I need larger bolts, I go two sizes larger (1") so they are not mixed up in the field.
RE: Designation of Bolted Connections...
are all TC bolts SC?
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
i.e. it can become a partially fixed connection.
csd
RE: Designation of Bolted Connections...
RE: Designation of Bolted Connections...
Are you sure about that? Dont shear tabs rely on shear ploughing to ensure this flexibility - something that wont happen until slip has occured.
Also, the connection will attract more moment due to the additional stiffness of the slip critical bolts.
As I said above, this would only be in certain situations - namely where the bolts are far enough apart to induce a significant moment.
csd
RE: Designation of Bolted Connections...
TC bolts does not necessarily mean a slip critical connection. For a slip critical connection, there are faying surface issues to deal with.
You can fully tension bolts in bearing connections. This is mentioned implicitly in the 13th edition specification J3.1 and explicitly in RCSC specification Table 4.1.
It is OK to use slip critical bolts in shear tabs. They require no different considerations than bearing bolts. See the procedure on page 10-101 in the 13th edition manual.
Ductility in the single plate connection is provided by several things, including bolt plowing against the plate or beam web, and bending of the single plate. That is why you size the weld at the plate to be stronger than the plate, so that the plate is guaranteed to fail in flexure (ductile) before the weld fails (brittle).