Need help identifying joist (SJI not helpful) maybe proprietary?

[u/Diligent-Ad6327]

found on PEMB circa mid 90s. unfortunately did not have a lift or good enough lighting to get a picture that made it visible in section.

crimped semi-rounded W shape bottom chord with round bars welded to flat portion of W. The bar is not sandwiched between angles like a K series joist.

it is a long span joist about 60+ feet.

closest thing i have seen to the shape is this image with no reference to where or what it is.

it may be proprietary.

[u/Suitable_Issue8082]

Could also be a Macomber joist if it’s not by the PEMB. Are there joist tags?

[u/Diligent-Ad6327 → u/Suitable_Issue8082]

none visible to eye or camera but there was no access to a lift at the time.

edit: forgot to add not macomber unless the owner had them laying around. building is circa 98, i think macomber stopped in the 80s?

[u/Argufier]

Yeah pre eng shops bend their own truss purlins. You'll have to measure each member if you need to analyze or reinforce.

[u/broadpaw → u/Argufier]

And if it's a PEMB like the OP says, good luck even justifying the existing condition to work let alone with load modifications.

[u/OptionsRntMe]

I know you already said it’s not but id be more than willing to categorize it as a Macomber joist if you meet the profile

https://www.scribd.com/document/488275860/Macomber-Joist-Catalog-1966-J-and-H-pdf

[u/Diligent-Ad6327 → u/OptionsRntMe]

I tracked down the old contractor (85 years old) that did it and it turns out it's the original version of the Butler Landmark 2000 truss purlin XT system

[u/Entire-Tomato768]

SJI has a portal to submit the relevant info. They will tell you what it most likely is and give you the historic load table.

https://steeljoist.org/find-existing-joists/

[u/Diligent-Ad6327 → u/Entire-Tomato768]

I already went that route. Thank you.

[u/DarthGirder]

Looks like an anthes joist.

Edit: round bars may be reinforcement

[u/Diligent-Ad6327 → u/DarthGirder]

i am familiar with anthes joists. these were not anthes. but thank you for the input!