Minimum steel in pier
Minimum steel in pier
(OP)
I was asked to review a reinforced concrete footing/pier which supports a steel canopy. After review the footing meets code and is more than adequate, but the pier has less than the code required long. steel for columns (<0.3%). The pier meets the criteria for mass concrete dimensionally, but with anticipated lateral loads, the resultant is outside the middle third.
The issue is it is already constructed including final paving above. I am leaning toward saying to excavate and place mass concrete around the pier.
Any thoughts? Thanks in advance.
The issue is it is already constructed including final paving above. I am leaning toward saying to excavate and place mass concrete around the pier.
Any thoughts? Thanks in advance.






RE: Minimum steel in pier
RE: Minimum steel in pier
A second pier is slightly larger at 20"x20" and 24" high. with the same reinforcing and load.
RE: Minimum steel in pier
That's just my interpretation.
RE: Minimum steel in pier
Where is this code provision contained? ACI 318 says, in section 1.1.5, that it does not apply to portions of drilled piers embedded in the ground (except for certain seismic situations).
I'm not saying the design isn't suspect; rather, the minimum requirement you're referencing may not apply.
RE: Minimum steel in pier
RE: Minimum steel in pier
RE: Minimum steel in pier
Phi*Mn for the 16" X 16" pier = 10.8 KF (assuming f'c = 4,000 psi), so if the 5 kip lateral load is an ultimate load, you are OK (Mu = 10 KF).
DaveAtkins