Retaining Wall Minimum Tension Steel

[KCPEngr]

I am designing a cantilever retaining wall using some design software. I am not able to hand calc the same required tension steel as the program. I am trying to use the most conservative requirement from ACI 318 section 10.5 and 14.3. I notice that as I increase the moment on the stem, the As,min requirement increases. Is there a minimum steel calculation that includes the bending stress or moment ratios? Am I not looking in the right place?

 

[frv]

There is a minimum amount of steel based on geometry and material properties (if loads don't control, obviously), but there is an exception to it based on providing a minimum of 33% higher capacity (I believe- I may be wrong about that number) than analysis shows is required. Don't have ACI in front of me, so I can't point you to the right provision.

 

[JAE]

Look in ACI Section 10.5 - frv is right in that the program is probably using 1.33 x As(req'd) as the minimum amount as long as As(req'd) is less than the other minimums.