help identifying an irregular OWSJ chord 7

[andrew705]

Hello,

I am trying to analyze an open web steel joist in an existing building in Ontario, Canada.

My problem is, the top and bottom chords of the joist are an irregular shape that I have never seen before. If someone can help me identify the shape, and help me find the section properties, I will be able to analyze the joist. I have attached a picture of the cross section in question.

Some browsing around past threads has led me to the macomber v-beam series of chords. I have downloaded some information on the sizes they made, and this has been a great help. I guess I'm wondering if anyone can tell me if this was the manufacturer for sure, or if other companies were also making this shape.

 

[SteelPE]

BA

That is a whole bunch of eccentricity on those joist seats. Wouldn't want to be responsible for those jobs.

 

[BAretired]

andrew705,

There is not much to be gained by copying the Anthes catalog. It specifies chord sizes for various joist designations but it does not specify the web members used. You would need shop drawings for that.

It appears there were at least three types of end diagonal members which Anthes used. In some, the bottom chord was bent up to form an end diagonal then bent again to form the bottom of the shoe. In others, an open seam tube was used for both interior and end diagonals. The outside diameters of the listed Anthes O.S. Tubes do not necessarily conform to those in the sketch provided by Ailmar in his post. The end diagonal in Ailmar's sketch consists of two flat bars which are not shown anywhere in the catalog and whose yield strength is unknown.

If there are specific questions you have about the Anthes joist, I will try to find the answer from the catalog, otherwise you are simply going to have to use your best judgment.

BA

 

[BAretired]

Ailmar,

Looking again at your chord sections, they do not seem to have the same profile as the Anthes joists in my catalog. Be careful about what you assume in assessing an existing roof.

BA

 

[andrew705]

BA, thanks again for the help. really appreciate it.

 

[Robbiee]

BA,
Indeed, they are different and I was going to say that. In my case, some of the vertical tubes, which their ends were flattened, the flattened ends were placed perpendicular to the axis of the chords leaving small length for the weld. BA, Thank you very much for helping.

 

[BAretired]

I have spoken with Cam Roylance. He may have a copy of the Anthes catalog hidden away in his files, but in any case, I am sure that Cam is in a much better position to answer any questions about Anthes products than I am.

The joists with double flats as end diagonals are neither Anthes nor Great West Steel joists.

BA

 

[andrew705]

Thank you for your help.

 

[andrew705]

looks like maybe posts have been deleted here, probably because of the sharing of personal information... but mr. roylance, if you're still there, i am still very interested in speaking to you about these joists. your experience is quite valuable to me, as i deal with analysing joists almost every day.

 

[Linksteel]

to andrew705, try the phone book

 

[BAretired]

Hey, Linksteel...I looked you up on 411.ca. Your house seems to be overlooking a golf course. Do you get any golf balls landing in your yard?

BA

 

[Linksteel]

Hello BAretired..no golf balls....I am at 90 degrees to the 4th tee, so unless there is a very serious slice problem, I remain free of golf balls.....or serious hook if lefthanded !!!!

 

[Linksteel]

to Alimar and Andrew705 and BAretired
When Great West Steel purchased the assets of Anthes Steel Products in November 1971, I was moved from Winnipeg to Mississauga as the General Sales Manager for GWS ( Eastern ). Previous to this move I had been the the Western Canadian Sales Engineer for Anthes Steel Products from May 1961, through to July 1968, where after I became affiliated with GWS's Edmonton and Saskatoon manufacturing plant, to the purchase date of Nov. 1971
In these roles I became closely famliar with the attributes of the cold roll formed process and the application to this process to that of joist fabrication. In the 1970's there were 2 other fabricators who attempted to produce OWSJ's using CRF sections, York Steel and Frankel Steel. We really should meet as there is a thread of history here that will need be understood, if your current roof review work is to be made easier.

 

[BAretired]

Linksteel,

As much as I would love to get together with you guys for a beer and a discussion on steel joists, I don't know if I can justify the travel costs. The other two guys, Ailmar and Andrew705, however are both from Ontario. I am surprised they haven't been in touch with you by now.

BA

 

[Robbiee]

Linksteel,
I provided your contact info to the engineer who is working on this job. However, I believe he decided to reinforce the roof by adding new joists to maintain the same loads currently applied on these joists.