90 year old drawing nomenclature

[theonlynamenottaken]

I'm working with a 90 year old composite mid-rise in Alabama. I actually have drawings!!!

The drawings for the concrete joist floor systems use the following nomenclature in the Slab Schedules:

Tile & Joist:
T. + C. = 6" + 2-1/2"

Joist:
5" @ 25"

Then in the framing plans there is nomenclature like:
6"M.T. + 2-1/2"C

Any ideas?

 

[BAretired]

Tile & Joist
T. + C. = 6" + 2-1/2"
I think this would be 6" deep tile with 2.5" concrete slab over.

Joist:
5" @ 25" would likely be 5" wide Joist with 20" space between.

Then in the framing plans there is nomenclature like:
6"M.T. + 2-1/2"C

Don't know what the M. stands for, but this notation is similar to the first one, i.e. 6" deep tile with 2.5" concrete slab for a total depth of 8.5".

Are there any cross sections showing the typical floor? And also, are there schedules showing reinforcement? I would imagine the reinforcement would be plain square bars in those days without deformations.

BA

 

[ToadJones]

Could be twisted bars too!
I have since mill column foundations with twisted square bars in some ghastly arrangements.

 

[mijowe]

Structure mag has a couple of articles on "antiquated structural systems" It is possible that it is one of these:

http://www.structuremag.org/article.aspx?articleID=563

http://www.structuremag.org/article.aspx?articleID=687

The second link is consistent with BAretired's description.