Deck spanning wall to long span joist
Deck spanning wall to long span joist
(OP)
Consider a long span roof joist; say 70', parallel to a wall. The roof deck spans from a steel angle bolted/anchored to the wall over the roof joists. The bearing angle is obviously a rigid connection as it can't deflect but the bar joist can deflect 2"-3" at the center under live load. I have seen this detail and used multiple times but I was wondering if excessive deflection (very long joist) could create any issue with the roof deck.






RE: Deck spanning wall to long span joist
RE: Deck spanning wall to long span joist
1)Compensate for the camber of the joist with the wall angle:
2)Specify the required camber for the end joist to be 1/2 the design camber.
This is similar to what Ron is referring to in his post above.
RE: Deck spanning wall to long span joist
Thanks for the idea. Could be useful in the future.
SteelPE,
Actually the side wall is a percast panel. Instead of embed angles I asked for embed plates and the angle is to be welded in the field so I think it would be easier to match the camber. Also, the joists are spaced closer next to the wall 2', 4' and then 5' c/c. So I think the LL deflection from angle to the first joist should be minimal (probably 1-1.5" or less).
RE: Deck spanning wall to long span joist
Ron - I don't think I understand the slot concept. Could you maybe elaborate?
Thanks.
EIT