Cold Formed Steel joist data
Cold Formed Steel joist data
(OP)
I'm doing an evaluation of an Prefabricated Metal Building. I'm looking for data on the buildings steel joists. The steel joist's bottom and top chord are not double angles. They are similar to the shape drawn here \__|¯¯|__/ . The web elements are bent pipe sections 3/4" in diameter. Is there a design manual or load table for this type of steel joists? Thanks!






RE: Cold Formed Steel joist data
RE: Cold Formed Steel joist data
RE: Cold Formed Steel joist data
A copy of the last Macomber catalog can be downloaded from SlideRuleEra's web site. But again, the shape seems to be slightly off.
RE: Cold Formed Steel joist data
If it is a standard SJI joist, you should be able to use a standard SJI catalog for load tables. If it is a non-standard SJI joist, and you know the manufacturer then maybe one of us might have a catalog to help. Please note that the type of chords or web do not necessarily make it a non-standard SJI joist, the joist designation does.
How do you know the webs are pipes? Are you sure they are not rods?
Macomber made several different types of chords and that might be one of them. Macomber went out of business in the late 60's, early 70's.
RE: Cold Formed Steel joist data
RE: Cold Formed Steel joist data
The chords were the cold-rolled "hat" sections that you show in your sketch. The web members were pipe section. Except for the end diagonals, which were a separate piece, the web was a continuous pipe bent in a zig-zag fashion. It was crimped almost flat at the panel points so it would mate with the flat of the "hat". The whole thing was resistance welded to the chords in one operation, all joints. It was really a pretty neat thing.
I suggest you contact Butler in Kansas City, MO. They should be able to help you.
RE: Cold Formed Steel joist data