Load Factors used in 318-63 2

[JAE]

I'm looking for information concerning the load factors used in ACI 318-63. I have a copy of the 318-77 and references to the 318-71 where they indicate the older 1.4D and 1.7L were the norm.

My question is this - were the load factors different in the 318-63 document? We are trying to pin down an existing structure load capacity built in 1968 and an older engineer that was involved in it seems to recall using 1.5D and 1.8L.

With these higher load factors I would then question whether the 318-63 used a [Φ] factor as well....or was it LFD instead of LRFD initially and then changed in the 71 code.

 

[JAE]

hokie66? I seem to recall you might have a copy.

 

[ash060]

I happen to have a copy of ACI 318-63 at the office.

I think the attached pages should help.

 

[JAE]

ash060 - thank you.

Also - did 318-63 have a prestressed concrete section? If so, did these load factors apply and did the same [Φ] factors apply?

 

[hokie66]

JAE,
Yes, there was a prestressed concrete section. Chapter 26--Prestressed Concrete. Pages 113 to 125. The load factors and capacity reduction factors were the same as in the pages which ash060 posted.

 

[JAE]

Thank you both. Appreciate it.

 

[msquared48]

Yea... 1.5 & 1.8 in mine too along with phi of .9 for flexure, .85 for DT, bond and anchorage, .75 spiral and .7 for tied compression.

Mike McCann
MMC Engineering