Existing Joist Data

[ArchEng2023]

Hello everyone. First post here, and thank you in advance.

I am looking for some assistance with some existing open web steel joists. These are on a project circa 1958-1959. The joists in question have a U-shaped chord with flat sections on each side. This is obviously some form of cold formed chord. (photos in links below)

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1700513087/tips/IMG_1575_e28e0j.heic[/url]

[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1700513112/tips/IMG_1576_fmuy0o.heic[/url]

So far, I've been able to find something similar from the Structure Magazine series, Link. Based on the table from page 5 and the Figure 21 It looks like it could potentially be Truscon A-S or B-B series joist, but I cannot find any data on these. All that I can locate from Truscon is the O-T series. I also searched for Truscon on this forum with no luck. If anyone has these other joist catalogs or data it would be greatly appreciated!

 

[bones206]

Try to get a look at a tag and a joist seat.

 

[ArchEng2023]

The best picture I could get of the seat is below. It looks like it is likewise made from a U-shaped piece of steel, I'm guessing just welded to the top U. I didn't even bother looking for tags as these joists are pretty near inaccessible due to the ceiling and insulation. A ceiling tile may have sacrificed itself just to get these photos.


[URL unfurl="true"]https://res.cloudinary.com/engineering-com/image/upload/v1700514765/tips/IMG_1573_pissjn.heic[/url]

 

[JAE]

Can you post jpg files instead of heic?

 

[JAE]

See if this matches - Macomber catalog from 1968 (some time later than your 1958-1959)

 

[ArchEng2023]

Here are the converted images.

 

[JAE]

That doesn't seem to match the Macomber profile very well.

 

[ArchEng2023]

Based on what I've seen I don't think they are the Macombers. They are an open half circle section, not the pinched V.

 

[bones206]

Kind of resembles the Sheffield shape, although it could be Trusscon. The Trusscons look like they have a different cross section at the seat though.

I've attached what I have for both companies (probably downloaded from Slide Rule Era way back when). I've also found a lot of old joist catalogs from the Internet Archive.

https://files.engineering.com/getfi...c6d013&file=Sheffield_H_&_J_Series_c.1963.pdf

https://files.engineering.com/getfi...650842&file=Sheffield_Steel_Joists_c.1957.pdf

https://files.engineering.com/getfi...-4d5b-a8be-307fc5c9a935&file=Truscon_1954.pdf

https://files.engineering.com/getfi...e2a9b2685c8&file=Truscon_O-T_Steel_Joists.PDF

 

[jerseyshore]

Did you send these in to SJI? Did they have a guess?