1917 RR Truss Rating

[bnjneer]

I am looking at a 1917 RR Bridge Stress sheet, and it shows the net section properties, gross section properties and "bal". Do any of you know what "bal" stands for in the stress table? I have never seen this listed before on other old plans for bridges I have rated.

Thank you.

 

[bridgebuster]

I posted a response in the bridge forum. You should ask the management here to delete this post as they do not like repeating a question in multiple forums.