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concrete beam in tension

concrete beam in tension

concrete beam in tension

(OP)
Hi, Im wondering what is the proper way to reinforce concrete beam that is (only) in tension (im talking about larger tension forces,lets say 100 kN)

Is classic rebar reinforcement alright? I guess not...?
How to anchor reinforcement in the nodes (corners of the RC frame)?



RE: concrete beam in tension

It's good that you're thinking about these issues. Some recommendations:

1) some codes prohibit the use of lap splicing in favour of mechanical splicing in tebpnsion ties.

2) Consider acceptable tie elongation in addition to strength.

3) Detailing at the ends is critical. Something similar to beam hanger reinforcement. If your tie beam bars are small enough in diameter, I'd like to see horizontal u-bars in the beam. If it's possible, another attractive solution would be to run the beam past the supports a bit. Headed bars could work too.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: concrete beam in tension

Connection detailing may steer you towards only using only the bottom bars for tensile strength.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

RE: concrete beam in tension

(OP)
Interesting, I had in mind something similar.
I think most of the time nobody thinks about it so they just reinforced it with no special details...

thanks for your post and a sketch.

regards

RE: concrete beam in tension

Quote (n3jc)

I think most of the time nobody thinks about it so they just reinforced it with no special details...

I think so too. Concrete joints seem to mostly get "detailed" rather than designed. Then, in less conventional situations like this, folks don't know how to detail properly because their detailing was never really informed by design to begin with. Chicken and egg.

I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.

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