Reinforcing Steel in old drawings 1

[Mansour2003]

I'm doing analysis on an old bridge, designed in 1954. There are only few lines on this plan as for "General Notes!". When it comes to steel and concrete, it says
" REINFORCING STEEL TO BE HARD GRADE FOR COLUMNS AND INTERMEDIATE GRADE FOR ALL OTHER LOCATIONS."

Now my question is what are hard and intermediate grades?! What is Fy?

 

[Taro]

Per FEMA 356 Table 6-1, rebar typically came in 3 grades prior to 1968:

Structural: Fy = 33 ksi, Fu = 55 ksi
Intermediate: Fy = 40 ksi, Fu = 70 ksi
Hard: Fy = 50 ksi, Fu = 80 ksi

 

[JAE]

The following info is per CRSI Engineering Data Report No. 48:

Hard Grade is referred to reinforcing with Fy = 50,000 psi. and Fu = 80,000 psi.

Intermediate Grade is referred to reinforcing with Fy = 40,000 psi and Fu = 70,000 psi.

Structural Grade is referred to reinforcing with Fy = 33,000 psi and Fu = 55,000 psi.

These are tied into the following ASTM's:

1911-1966 - ASTM A15 (billet steel) (all three grades)
1913-1966 - ASTM A16 (rail steel) (Hard Grade only)
1936-1964 - ASTM A160 (axle steel) (all three grades)

I think you can get this document from

http://www.crsi.org

 

[bridgebuster]

The old AASHTO "Manual for Maintenance Inspection of Bridges" provides the following guidance for allowable unit stresses in tension:
Structural or unknown grade prior to 1954: 18 ksi for Inventory Rating and 25 ksi for Operating Rating.

Grade 40 Billet, Intermediate, or Unknown Grade (after 1954): 20 ksi for Inventory and 28 ksi for operating.

Grade 50 Rail or Hard: 20 ksi Inventroy and 32.5 ksi operating.

 

[chicopee]

What are you upgrading? Structural steel, piers, footing, deck?...