Historic Bar Joist Identity 1

[bigmig]

I have come across a historic bar joist product on a project and am having trouble tracking down anything like it in the Steel Joist Institute catalog.

The joist is 16" deep. The top chord is 1. 1/2" angles, spaced by a 1/2" round web. The web is a continuous, albeit bent, member.
The bottom chord is also a pair of 1/2" rounds, welded on either side of this serpentine web configuration.

Per my limited research, the original bar joists had top AND bottom chord rounds. I can't find any reference to a system with only rounds on the bottom chord.
Any pointing in the right direction would be appreciated.

A photo of the system is attached.

 

[SlideRuleEra]

Macomber open web joists in the 1930's used round bars for both the top an bottom cords. For a 16" deep joist, the bar diameters don't match your measurements. Perhaps yours are from a slightly different time period. You can download the bar joist portion of the 1934 Carnegie Pocket Companion from this page of my website (just below the middle of the page), see page number 385:

http://www.slideruleera.net/contributions.html

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net

 

[bigmig]

I found this article for everyone's future use (see attached). Figure 7 is the system discovered on this particular project.