minimum footing rebar

[delagina]

am checking a footing with very minimal load.

it is 2 ft thick to match existing. no piers. base plate directly to footing.

he put rebar less than temperature bars of 0.0018.

any comment as to minimum rebar for negligible load for 2ft footing?

i did read on ACI that for slab on ground no need to satisfy temperature bars.

thanks,

 

[rday]

It could be designed as plain concrete.

Why not just call the designer and ask?

 

[JAE]

delagina,
Take a look at these threads:

thread167-225434

thread507-207910

thread507-185223

Also, I don't think you can technically avoid ACI 10.5.4 and 7.12 provisions for footings deeper than required by load.... in other words, 10.5.3 doesn't appear to apply to footings/mats.

 

[tumbleleaves]

I think the designer is right. Agree with rday, call the designer and ask.

My recollection of footings is that if the moment of the uncracked section is some factor bigger than the required moment then you don't need flexure reinforcing. Also, the idea of temperature rebar for a footing is misfounded. A couple bars for shrinkage and to hold the cracks together, but that's all.

As rday said you can always design plain concrete.

Just call the designer and ask.

 

[delagina]

thanks,

i doubt designer have calculation. he just used "gut feel" based on experience approach.

i wanted to comment on his drawing provide at least 0.0018BH rebar, but decided to ask here.

anyway, seems it's ok since it's 2ft deep.