Slotted holes in bracing connections
Slotted holes in bracing connections
(OP)
Hello All,
I'm currently working on some bracing connections and I'm concerned about relative deflection between the two points we're bracing between. Through doing some hand-calcs it looks like there will be 0.239" of relative deflection (conservative) which would require the brace to elongate/compress something like 0.06". In order to resist that I'd need my connection to account for 100kips of load, and that just isn't going to happen. Instead I was thinking I could allow for slotted holes and maybe have the connection designed as slip critical, although I'd really love to keep it as a bearing connection.
If that's the case, I'm wondering if slipping is even allowed in slip-critical connections; and if slipping occurs does it regain it's resistance once movement has stopped? Also, would the slip resistance induce a large unwanted moment in the connection?
Other than that, are there any allowable ways of keeping a bearing connection while still allowing for a little axial movement?
Thanks!
Donuts
I'm currently working on some bracing connections and I'm concerned about relative deflection between the two points we're bracing between. Through doing some hand-calcs it looks like there will be 0.239" of relative deflection (conservative) which would require the brace to elongate/compress something like 0.06". In order to resist that I'd need my connection to account for 100kips of load, and that just isn't going to happen. Instead I was thinking I could allow for slotted holes and maybe have the connection designed as slip critical, although I'd really love to keep it as a bearing connection.
If that's the case, I'm wondering if slipping is even allowed in slip-critical connections; and if slipping occurs does it regain it's resistance once movement has stopped? Also, would the slip resistance induce a large unwanted moment in the connection?
Other than that, are there any allowable ways of keeping a bearing connection while still allowing for a little axial movement?
Thanks!
Donuts






RE: Slotted holes in bracing connections
RE: Slotted holes in bracing connections
RE: Slotted holes in bracing connections
As far as I'm aware, the standard (button below => engineering.com) upload service works great, and is never blocked.
Why won't you use that one?
RE: Slotted holes in bracing connections
Dik
RE: Slotted holes in bracing connections
RE: Slotted holes in bracing connections
Only one bolt is used because we needed to allow for rotation. Is the 2 bolt minimum a code requirement or is it something contractors will universally ask for? The contractor on this project hasn't been willing to talk to us.
RE: Slotted holes in bracing connections
Also, what it the purpose of the steel beam?
RE: Slotted holes in bracing connections
RE: Slotted holes in bracing connections
Do you have to have the double braces, as opposed to a beam of sufficient depth to provide both lateral and rotational restraint on one side only between the steel and concrete girder?
RE: Slotted holes in bracing connections
Mike McCann, PE, SE