I considered that they were perhaps Clerespan series, but they are installed on about ~26' span, and the table for 20" joists starts at 29'-0". I built a model of a single joist, and backed out an allowable live load of about 80 psf. I then applied that load to the supporting girders and that...
Hello,
I have a similar situation, and I am drawing a blank on getting good data. The style of construction matches very closely the Truscon OT joist, but my dimensions do not match any of those in the linked publications.
My joists are 19 3/4" deep, and have a panel point spacing of 22"...