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DBA = deformed bar anchor ?? 1

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boffintech

boffintech

Civil/Environmental
Jul 29, 2005
469
Am inspecting at a project where several large plate embeds are shown on the structural drawings as having "1' #6 DBA w/180 ACI STD. HK".

OK, I read that as a # 6, grade 60, weldable piece of rebar 1' long + a 180 hook. A #6 bar ACI standard hook should have a diameter of bend of 4.5" and a 4d tail.

The contractor is a couple of floors away from actually placing these embeds but I saw a stack of embeds unloaded from a truck yesterday.

What they have is a 1' smooth dowel + a 180 hook. The hook has a 3 1/2" diameter of bend and a 1 to 2d tail. The smooth dowels have been "notched" to a depth of 1/8" at 1" spacing on 4 sides. inverted deformations?

Is there any way that they got that right?
 
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I read it the way you do. I would ask who manufactured the DBA you have on site and ask for a spec sheet with load capacity, etc.
 
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DBAs are low carbon, weldable, deformed steel bars that meet the requirements of ASTM A496.
 
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And, lo and behold, they are "deformed", not smooth.

 
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Agree with the others. You read the plans correctly. I would notify the contractor and the Engineer of Record.
 
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I sent a picture to the EOR. Have not heard back yet

Thanks for the hrlp.
 
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I use deformed bar anchors sometimes because I can't get pullout strength to work using headed studs. Nelson stud makes the D2L (a deformed bar anchor) up to 36" long. They can be used as tension lap splices with vertical reinforcement in the walls. Its like tieing you embed plate to the vertical steel reinforcment. While one foot length doesn't sound like a lap splice situation the engineer of record needs to know because the acceptance of the other product may depend on how the DBA's were intended to be used.

Most likely the contractor has messed up here.
 
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Thanks for the info southard2. I looked up the D2L DBA, but from the Nelson info it looks like the deformations are raised, similar to rebar deformations. On the DBAs I see here at the project site the deformations are cut in, like with a grinder. The cuts are about 1/8" deep spaced at 1" on 4 sides of the round bar. Is that a D2L?

2wnognc.jpg
 
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From the photo, these looked like deformed bar anchors to me.
 
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