Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

1950s Lightweight Concrete Compressive Strength

Status
Not open for further replies.

sawoods

Structural
Joined
Aug 13, 2012
Messages
4
Location
US
I am currently using original construction drawings from 1959 to determine whether or not a roof stucture can support new imposed loading. The drawings show a " 2" lightweight pre-cast concrete plank" roof deck. This is the only information the drawings contain concerning the roof deck. What strengths were they making back then that I could used for an assumed value of f'c for the concrete?
 
Try 2000 psi. It likely was more than that.

BA
 
2"? The supporting members must be at 3 to 4' spacing then?

2000 psi is a reasonable assumption without using special concrete testing equipment.

Mike McCann
MMC Engineering
 
I've seen similar... max span approx 2'-6"... and f'c=3000 psi...

Dik
 
The supporting beams are at 6'-6" O.C. The concrete planks are only about 12" wide. One spot of spalling reveals some pretty heavy duty W.W.R., but otherwise, they seem to be in good shape. It seems like a pretty questionable system, but it's worked for over 50 years, with a ballasted roof until just recently, so it can't be all bad.

Thanks for the help.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top