Expansion joint detail parallel to joist span
Expansion joint detail parallel to joist span
(OP)
I have an expansion joint in my metal deck that runs parallel with the bar joist. I need to transfer a shear load across this joint. Does anyone have suggestions on how this is done? Diagonal brace across joint? What happens at my chord members at this joint? Thank you






RE: Expansion joint detail parallel to joist span
RE: Expansion joint detail parallel to joist span
RE: Expansion joint detail parallel to joist span
Can you assume a 3 sided box? Don't I have a flexible diaphragm?
RE: Expansion joint detail parallel to joist span
RE: Expansion joint detail parallel to joist span
I understand what you are doing. I've done this myself. But being a flexible building can we really do this? Technically this is a flexible diaphragm and this isn't suppose to be done. Tributary areas are suppose to be used not torsional resistance. Like I say, I've done it but don't know if it works in this case because I have a long slender building. Let me know what you think.
RE: Expansion joint detail parallel to joist span
I would only attempt what I am describing with an approximately square diaphragm. If you have a long narrow building, you should use rigid frames or some other type of bracing system and not attempt to transfer very much shear across the joint.
RE: Expansion joint detail parallel to joist span
Yes, agree totally with what you are saying. I'm definitely dealing with a flexible diaphragm. My structure is about 100'x400'. I was going to provide a expansion joint in the center and treated as a simple 400' beam. I was going to put my expansion the middle of the building where there is zero shear. But at the location is my largest moment. So I need to have a continuous chord at that location. Can that go through my expansion joint? Maybe I'm barking up the wrong tree and should just analyize 2 seperate diaphragms.
RE: Expansion joint detail parallel to joist span
If so, you may not need an expansion joint. 400' without an expansion joint is 'do able' in a single story, steel framed building.
RE: Expansion joint detail parallel to joist span
RE: Expansion joint detail parallel to joist span
Go with 2 separate diaphragms!
RE: Expansion joint detail parallel to joist span
Thats not the answer I wanted!!! Erase your last post and tell me something different. I suspected thats what I was going to hear but I just didn't couldn't accept it. Thanks
RE: Expansion joint detail parallel to joist span
RE: Expansion joint detail parallel to joist span
Take jike's advice. You can't have it both ways.