1963 2-way slab notation question

[cliff234]

I have some old 1963 concrete flat plate drawings. They use bar designations I am not familiar with.

See the attached image.

18BC6: (18) bottom bars, column strip #6 bar?
26TC6: (26) top bars, column strip #6 bar?

Is anyone familiar with this reinforcing steel nomenclature?

Thank you in advance!

 

[bugbus]

That sounds right. I was going to suggest that 'C' and 'M' might mean cold-worked and mild, respectively, but column and middle strip possibly makes more sense.

 

[dik]

They would't likely mix two different grades of reinforcing...

-----*****-----
So strange to see the singularity approaching while the entire planet is rapidly turning into a hellscape. -John Coates

-Dik

 

[bookowski]

See attached legend from a 1961 flat plate job. You've got it right - T = top, M and C are bottom middle and column. It looks like you've got drop panels as well. I've got a very similar building.