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Old rebar question
2

Old rebar question

Old rebar question

(OP)
I am trying to evaluate a floor system in a building that was constructed in 1919. The floor is a reinforced T-beam system made with clay tiles. I have the reinforcement schedule that indicates both round bar and another shape that I am not familiar with. It looks like a square with a "T" through it. I have attached a picture of the schedule.

Has anyone seen this designation before? Also, can someone direct me to some reference materials for typical rebar properties during the early 1900's?

Thanks

RE: Old rebar question

Give ACI & CRSI a try.

RE: Old rebar question

It may mean that it is a "twisted" square rebar.

Joe Tank

RE: Old rebar question

See CRSI's Engineering Data Report Number 48 "Evaluation of Reinforcing Bars in old Reinforced Concrete Structures".  It doesn't answer your question, but may help with some others.

RE: Old rebar question

Old rebar was often twisted to increase the bond as well as provide some strain hardening.  I've encountered square bars with a 'T' and it denoted twisted square bars.

Dik

RE: Old rebar question

The 1920, "Handbook of Building Construction" has quite a bit of information on reinforcing steel from that time (written by noted engineer George Hool). The complete book is online at Google Books; reinforcing steel data begins on page 958 at this link:
http://books.google.com/books?id=KFhDAAAAIAAJ&pg=PA958&dq=reinforcing+steel&as_brr=1#PPA958,M1

Any book published in the USA before 1923 is in the (USA) public domain (no exceptions)... and is likely available for viewing and download, in its entirety from Google Books. A good source when working on older structures.

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