Old Reinforcing Material
Old Reinforcing Material
(OP)
I have some old drawings that I am analyzing the existing 2- way flat slab for an occupancy load increase. The drawings are over 40 years old and list the following:
Vertical Reinforcing in Columns (intermediate grade)..fs=16,000psi
Welded Wire Mesh....fs=24,000 psi
All other Steel (intermediate grade)...fs=20,000 psi
All concrete to have a compressive strength of f'c=3,000 psi
I think the reinforcing is being given as the allowable design stresses using a factor of 0.4. In other words, the "all other steel" actually has fy=20/0.4=50 ksi reinforcing steel material, and the column steel is 16/0.4=40ksi material.
Is this correct for 40 year ago ACI practice?
Vertical Reinforcing in Columns (intermediate grade)..fs=16,000psi
Welded Wire Mesh....fs=24,000 psi
All other Steel (intermediate grade)...fs=20,000 psi
All concrete to have a compressive strength of f'c=3,000 psi
I think the reinforcing is being given as the allowable design stresses using a factor of 0.4. In other words, the "all other steel" actually has fy=20/0.4=50 ksi reinforcing steel material, and the column steel is 16/0.4=40ksi material.
Is this correct for 40 year ago ACI practice?






RE: Old Reinforcing Material
RE: Old Reinforcing Material
RE: Old Reinforcing Material
RE: Old Reinforcing Material
RE: Old Reinforcing Material
For WSD, the 1983 Code restricted reinforcement in spiral columns to .4fy, and tied columns to .85 x .4fy.