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Compressive Strength of Rebar (vertical)

Compressive Strength of Rebar (vertical)

Compressive Strength of Rebar (vertical)

(OP)

Of course I know since ages ago that concrete has strong compressive strength and poor tensile strength. We always specify the compressive strength of concrete by say 4000 psi. How about a rebar? I know it's tensile strength is in unit of say 414 mpa for a 20mm grade 60 rebar, how about the compressive strength of the same rebar (let's say it's vertical?) What's the value and unit?

RE: Compressive Strength of Rebar (vertical)

Tensile and compressive yield strength of steel is taken to be the same.

RE: Compressive Strength of Rebar (vertical)

Quote (khinz)

...(let's say it's vertical?)
if vertical don't forget buckling instability

RE: Compressive Strength of Rebar (vertical)

khinz...assuming you are an engineer, do you have an engineering supervisor or mentor? (not the contractors or managers you've talked about)

RE: Compressive Strength of Rebar (vertical)

(OP)

We are all civil engineers. I'm a newbie and there are 20 other around. Anyway, the company has seek the advices of other companies in dealing with the problem and will do inspections and solutions to it after reports done by them. Thanks.

RE: Compressive Strength of Rebar (vertical)

(OP)
Hokie wrote: "Tensile and compressive yield strength of steel is taken to be the same."

I see. Finally I understood why Pu = 0.65 x 0.8 * fc(Ag - As) * fy(As). I only memorized this before and put this in my excel when trying out axial load capacity.

I guess the safest structure would be to design axial load capacity to match the steel fy(As) only and the concrete as extra to avoid buckling.

RE: Compressive Strength of Rebar (vertical)

Quote (khinz)

I guess the safest structure would be to design axial load capacity to match the steel fy(As) only and the concrete as extra to avoid buckling.

I think this is related to the 'concrete in a bag' you are planning on replacing the crappy concrete with in your other threads; therefore, I do not think is accurate. *If* you are considering the bars to be fully braced by the concrete (no buckling) and taking all of the axial capacity, you have to look more carefully at the concrete cover distances.

I hope you are not using that 1-2-3 mix to do provide this cover. I know you keep creating new threads, but if they are not related to some other project, there is no way we can comment on these threads without considering the context of your project.

In Russia building design you!

RE: Compressive Strength of Rebar (vertical)

Quote (khinz)


I see. Finally I understood why Pu = 0.65 x 0.8 * fc(Ag - As) * fy(As). I only memorized this before and put this in my excel when trying out axial load capacity.
I think * fy(As) should be + fy(As)

BA

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