sizing of reinforcement question 1

[dirtbeater]

Hi all,

I have to size reinforcement for a very thick short retaining wall (under 6 feet in height). The thickness (2.5 feet thick) is based on aesthetics and must be maintained.

For design of the stem, when I check to see what my min. As is based on the overall stem Ag per ACI, my requirement for reinforcement is obviously becomes very large - way more than what my flexure calcs actually require because the wall is so short.

Any insight/tips?

Thanks

 

[JAE]

Under ACI 318 (not sure of your specific code) - section 10.5.3 allows you to use (min As) = (required As) x 1.33



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[precast78]

What JAE said. Required As x 1.33 will probably control. You probably just want to put one layer of steel in the middle instead of one on each face.

 

[KootK]

It might be a good application for an unreinforced gravity retaining wall. I've always wanted to try that. PCA has a freely available design guide for those. As I understand it, unreinforced stuff made from good concrete pretty much lasts for ever (Parthenon). Control joints of course.

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[TLHS]

If aesthetics are an issue, you may want reasonably spaced skin reinforcement to control crack width.

 

[frv]

I've never actually used it, so I don't have any insight, but you may be able to design it as Structural Plain Concrete (Chapter 22).

 

[dirtbeater]

ok


thanks all for the insight