Sloping Top Chord of Steel Joist
Sloping Top Chord of Steel Joist
(OP)
I emailed a rep from Vulcraft a few days ago and haven't received a response from him yet, so I thought you all might be able to help me.
1. Are only long-span joists able to have a double-pitched top chord? Can K-series joists span a ridge line with the top chord having a double pitch? The pitch of the roof is 1/4" per foot.
2. I have a long-span joist 40'-8" long being used as a girder (with the double-pitched top chord) to pick up a point load (~30k) from a W24x55 beam that is running perpendicularly to it. This beam is bearing a mid-point of the joist only. How do I choose and specify a joist girder for this condition? How would you suggest connecting the beam to the joist (not the joist to the beam)?
Thanks everyone!
1. Are only long-span joists able to have a double-pitched top chord? Can K-series joists span a ridge line with the top chord having a double pitch? The pitch of the roof is 1/4" per foot.
2. I have a long-span joist 40'-8" long being used as a girder (with the double-pitched top chord) to pick up a point load (~30k) from a W24x55 beam that is running perpendicularly to it. This beam is bearing a mid-point of the joist only. How do I choose and specify a joist girder for this condition? How would you suggest connecting the beam to the joist (not the joist to the beam)?
Thanks everyone!






RE: Sloping Top Chord of Steel Joist
Not sure I've ever seen a WF beam frame into a joist girder. Just doesn't feel right. I know it can probably be done though.
RE: Sloping Top Chord of Steel Joist
No reason to reinvent the wheel here if you know what I mean.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: Sloping Top Chord of Steel Joist
I believe the preferred connection will be a vertical angle (web) in the steel joist where your WF can frame into the angle. That way you have a standard steel shear connection and your beam is properly braced for stability purposes. When Vulcraft calls you back you can bounce that off of them. Of course, clearly indicate this on your drawings, they can clarify this during the shop drawing process.
RE: Sloping Top Chord of Steel Joist
RE: Sloping Top Chord of Steel Joist
Also, similar to a2mfk, he said they would provide an angle connection to the beam and that I need to specify the leg length of the connecting angle and bolt hole diameter to connect to the web of the beam.
Thank you all for your suggestions and help. :)
RE: Sloping Top Chord of Steel Joist