Load factors in ACI 318 1971
Load factors in ACI 318 1971
(OP)
we are checking a concrete floor built in 1974.
The current load combination is 1.2DL+1.6LL from ACI 318.
I am wondering what they used in 1974. 1.4DL+1.7LL?
we do no have a copy for ACI318 1971. Can anyone help me out?
Thanks.
The current load combination is 1.2DL+1.6LL from ACI 318.
I am wondering what they used in 1974. 1.4DL+1.7LL?
we do no have a copy for ACI318 1971. Can anyone help me out?
Thanks.






RE: Load factors in ACI 318 1971
U = 1.5D + 1.8L
or
U = 1.25(D + L + W)
or
U = 0.9D + 1.1W
BA
RE: Load factors in ACI 318 1971
BA
RE: Load factors in ACI 318 1971
RE: Load factors in ACI 318 1971
Garth Dreger PE - AZ Phoenix area
As EOR's we should take the responsibility to design our structures to support the components we allow in our design per that industry standards.
RE: Load factors in ACI 318 1971
RE: Load factors in ACI 318 1971
Thank you. Please let us know the load factors and the reduction factor of ACI 318 1971
RE: Load factors in ACI 318 1971
Please see the attached pdf.
According to the paper (to calculate the overall or global factor of safety, line 12-18), we can solve these two equations to find the load factors
a*D+b*D (=L) = 1.72*0.9*2*D
a*D+b*D/2 (=L) = 1.67*0.9*1.5*D
then a=1.4, b=1.7
Somebody please verify those load factors if you have ACI318 1971. Thanks.
RE: Load factors in ACI 318 1971
U = 1.4D + 1.7L
RE: Load factors in ACI 318 1971
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Load factors in ACI 318 1971
I am very curious now. why are those load factors used in cocnrete (in such earlier days) while ASD were used for almost all other materails?
Does that come from a tradition or the ACI 318 committee just adopted some research paper using load factors? Does anybody know the particular reason?
Sorry, too many questions.
Thanks.
RE: Load factors in ACI 318 1971
1) Easier to calculate
2) Easier to match with test data
3) Someone had to be first.