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Development Length circular beam

Development Length circular beam

RE: Development Length circular beam

Link

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: Development Length circular beam

(OP)
Is this still valid in ACI 318-14?

RE: Development Length circular beam

Do you have reason to think otherwise? I can't really respond to your specific concern unless you direct me to it. I'm not going to read 318-14 back to back just to save you the trouble of doing it yourself.

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: Development Length circular beam

I think providing ties for your circular beam could be the same as for round columns. Provide 135 degree hooks at adjacent longitudinal bars.

RE: Development Length circular beam

Per hokie's direction, here's some more recent guidance on columns in seismic areas: Link\

Depending on the proportions of your beam, I'd be tempted to just reinforce it with a square cage.

If your beam is uniaxially loaded and not acted upon by significant torsion, I suppose you could use an open, circular stirrup extending up to at least 0.85 d and hooked inwards. That way you could drop flexural bars in from the top if desired.

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: Development Length circular beam

(OP)
I read that too and I don't want to bend the bars also. But that's IBC 2012 and I am following IBC 2015. There is nothing mentioned there related to circular splices.

RE: Development Length circular beam

Then I'd be inclined to use a two piece set lapped 1.3 Ld like with rectangular stirrups.

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: Development Length circular beam

While we are on the topic.....has anyone else been asked by contractors to extend each end of the tie to a vertical bar and hook it around the vertical bars? I've had a few people request that in that past for QC issues in the field. (I.e. the tie not staying put and bowing out.)

RE: Development Length circular beam

I haven't had a contractor request that, because that is the way we always detail it. And yes, the floating tails of the ties is one reason for doing it. Floating tails is a major reason for poor cover, resulting in corrosion and spalling. The same reason why we show top slab bars with the cogs not over the outside beam bar, but rather inside.

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