Old rebar question 2

[acrabtree65]

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

 

[kslee1000]

Give ACI & CRSI a try.

 

[Lion06]

Here is a pretty good paper on old rebar properties.

 

[JoeTank]

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

Joe Tank

 

[miecz]

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.

 

[dik]

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

 

[SlideRuleEra]

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.

http://www.SlideRuleEra.net

http://www.VacuumTubeEra.net