ACI 10.8.4 for Slender Column
ACI 10.8.4 for Slender Column
(OP)
I am evaluating existing slender concrete pier 24"x36" with reinf 8-#7 (0.56%). Column has very small loads and I have already checked column in accordance with ACI 10.13.4.2 Magnified Moments-Sway Frames. Question: Does ACI 10.8.4 (using reduced effective concrete area) apply for a slender column?
Thank you very much.
Thank you very much.






RE: ACI 10.8.4 for Slender Column
RE: ACI 10.8.4 for Slender Column
Column was designed 1992 and customer asked us to justify its compliance with the code. Column (exchanger support) is cantilevered and 26ft tall (kl/r=87).
RE: ACI 10.8.4 for Slender Column
I'm having a hard time seeing the moment magnifier being appropriate for this case. My understanding is that the moment magnifier is to capture P-little delta effects. I have to think you are far more concerned with P-big delta effects.
RE: ACI 10.8.4 for Slender Column
RE: ACI 10.8.4 for Slender Column
RE: ACI 10.8.4 for Slender Column
RE: ACI 10.8.4 for Slender Column
Mu=66.3K
I used 1.2DL+1.6WL. I also added in the wind shear of 0.25k at the top of the column and included the self-weight of the column.
RE: ACI 10.8.4 for Slender Column
RE: ACI 10.8.4 for Slender Column