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Cont top and bottom bar shar the same hooks..

Cont top and bottom bar shar the same hooks..

is it okey for a continuous top(CTB) and bottom(CBB) bar to share the same hook .. ( please see image bellow ) , what section of the code prohibits or allows this kind of detailing . . please check the length of hook if valid..

RE: Cont top and bottom bar shar the same hooks..

The detail you posted is too small for my eyes, but it looks like a 180 degree hook which is permitted by ACI for bar development, but you can't double dip and use it for developing the top and bottom bars simultaneously.

RE: Cont top and bottom bar shar the same hooks..

I simply wouldn't use a shared hook for the reason that bar placement is easier if you allow them to place the lower layer of bars first and then come back to chair up the upper layer of reinforcement.

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RE: Cont top and bottom bar shar the same hooks..

1) I know of no code provision that pertains directly to the development of U-bars.

2) I think that most engineers, in many situations, would consider U-bars to be a better development situation than a pair of independent hooks. I know that I would.

3) For flexural applications, it's unlikely that you'd ever have both sides of the U-bar in tension concurrently. As such, you may not really be "sharing" the hooks in any way that matters.

4) As others have mentioned, the detail presents constructibility challenges.

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: Cont top and bottom bar shar the same hooks..

Which code are you designing to?

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

RE: Cont top and bottom bar shar the same hooks..

whelp hello guys...

Im not designing .. but I was just building the tie beam... ( i forgot to tell you that it is a tiebeam )

anyways it wasn't that hard to build .. ( i should have took a picture of it )

I needed to do it cuz it could save the contractor a lot of money . for the materials

so to recap?

1.) it was not hard to build

2.) it saved a lot of money

if this are the advantages that I had experienced ... the last question is .. will it be safe?

RE: Cont top and bottom bar shar the same hooks..

As long as you have the development length required, there is no reason that you can't use a shared hook; I've done this for anchor rods numerous times. There is an issue of constructability that comes to play and it may be more costly than the added steel. It may assist with development in tighter spaces. I'm not aware of any code restrictions.


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