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Concrete Design

Concrete Design

Concrete Design

(OP)
Trying to decide when I can drop the minimum steel requirement in design.  For instance, vertical piers for a house.  Minimum steel puts the design way over...

RE: Concrete Design

My rule is normally if it wont collapse when the reo fails then it is okay to use less than minimum reo.

RE: Concrete Design

I'm in a high seismic area, and generally put in the mininum steel regardless.

Here, technically even 1'-6" square spread footings require bending reinforcing steel.  I admit that with shear controlling the design, and with not enough development length to develop the tension in the steel, it is ridiculous, but I do it anyway in most cases.  In small strip footings, to get the horizontal steel, I will just put a 4" to 6" bend on the wall dowels and alternate the bends in the strip footing.  Works for me.

Mike McCann
McCann Engineering

RE: Concrete Design

Have you considered looking at it as "plain" concrete?
Residential designs generally can be designed per the plain concrete section of ACI318.

RE: Concrete Design

As RBH says you can design as plain concrete. But have you considered all possible loads including accidental and construction loads? Personally I would use minimum reinf and sleep well.

RE: Concrete Design

you can use half of minimum if it's sized for architectural purposes, i believe.

RE: Concrete Design

Are you going to live in it? It is Cheep insurance, Go with engineering. Whats a few hundred more dollars, compared to the total investment of the house?

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