1960 era concrete construction 1

[dcarr82775]

I have a two way slab designed in 1960. only one or two legible drawings and they indicate bars similar to what you would expect nowadays for a two way slab. In that time frame was 40ksi the predominate steel strength? Seems 'safe' to make that starting assumption.

 

[Lomarandil]

The bridges I've seen from that time period use 40ksi "intermediate grade". Not sure how well that translates to a building (presumably) slab.

I've also heard the transition between rebar grades varied from region to region. Where is this project?

 

[JAE]

Check out this article - specifically the last paragraphs. See if this helps.

Page 1:

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[JAE]

Here's page 2:

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[dcarr82775]

Thanks JAE

 

[StrP88]

JAE (Structural)
Could you please attach the document as pdf. With my computer is really hard to read it.
Thanks you

 

[JAE]

Here it is

Check out Eng-Tips Forum's Policies here:
faq731-376

 

[BUGGAR]

20,000 psi allowable stress design for steel. That was pretty universal then. At that time, ultimate strength design was only used in aircraft failure analysis. Why would we design a building to go beyond yield?! That was then.