steel required for a column and wall footing
steel required for a column and wall footing
(OP)
Questioning the amount of steel required for a column and wall footing and difficulty interpreting ACI code 10.5. I had a professor that designed flexural footing steel for 3 things:
a) Min steel based on ?
As - ?bd
b) Min steel required for Flexure (ACI 318-02 - 10.5)
As=200/Fy*bd
c) Min steel based on shrinkage (ACI 318-02 - 7.12.2)
As=.0018bh
The max of these 3 would govern the steel used in flexural direction with 7.12.2 used as minimum for longitudinal reinforcement. After reading ACI 318-02 - 10.5 closer, 10.5.4 states that structural slabs and footings require min reinforcement in the direction of the span as that required for 7.12 (shrinkage and temperature). After reading this, it would seem that 10.5 (As=200/Fy*bd) does not apply for column and wall footings. In addtion, 'Notes on ACI 318-02' chap 22 examples only uses 7.12, not taking 10.5 into account either. is using 10.5 over reinforcing the footing and not necessary?
a) Min steel based on ?
As - ?bd
b) Min steel required for Flexure (ACI 318-02 - 10.5)
As=200/Fy*bd
c) Min steel based on shrinkage (ACI 318-02 - 7.12.2)
As=.0018bh
The max of these 3 would govern the steel used in flexural direction with 7.12.2 used as minimum for longitudinal reinforcement. After reading ACI 318-02 - 10.5 closer, 10.5.4 states that structural slabs and footings require min reinforcement in the direction of the span as that required for 7.12 (shrinkage and temperature). After reading this, it would seem that 10.5 (As=200/Fy*bd) does not apply for column and wall footings. In addtion, 'Notes on ACI 318-02' chap 22 examples only uses 7.12, not taking 10.5 into account either. is using 10.5 over reinforcing the footing and not necessary?





RE: steel required for a column and wall footing
RE: steel required for a column and wall footing
RE: steel required for a column and wall footing
Dik
RE: steel required for a column and wall footing
RE: steel required for a column and wall footing
Or is this also overestimating the ACI code?
RE: steel required for a column and wall footing
RE: steel required for a column and wall footing
The ACI code is woefully deficient in this area and the mere fact that engineers get conflicting guidance is testimony to my assertion. I feel it is long overdue to promulgate proper guidance in thie area.
RE: steel required for a column and wall footing