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Overlapping hoops

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Tstruct

Structural
May 14, 2023
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I am a little confused about overlapping hoops, which we call double/triple rings in my area. I am in an argument with another engineer about detailing of overlapping hoops. The other engineer's practice is to place 2 regular hoops immediately next to each other to make it a overlapped hoop, whereas my practice is as ACI 318-19 states in figure FIG.R.18.6.4. See attachment for both types.
Is the detail used by the other engineer correct?
 
 https://files.engineering.com/getfile.aspx?folder=69f9be67-829b-4448-83c2-4ddbab40cab7&file=overlapping_hoops_both_types.pdf
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Tomfh said:
I doubt it's an issue in 99.99% of cases.

I feel that's an underestimate. I design a fair number of concrete beams that require redistribution / compatibility torsion reinforcement that needs to create effective stirrup legs on all four beam faces. In this context, I feel that the bar lap shown below needs to, rationally, satisfy the same requirements that stirrup laps need to satisfy.

C01_ckwvcl.png
 
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