Rebar Vs Deformed Bar Anchor 2

[Qrs]

Excuse me if this is a dumb question, but what are the main differences between rebar (ASTM 615) and deformed bar anchors (A496). Is it a difference in material? size? deformation standards?

It seems to me that these can be used interchangeably in design, is that correct?

When would someone prefer one over the other? The main difference I can think of is that A615 is not weldable while deformed bar is...

Thanks.

 

[tolchijb]

A deformed bar anchor is more like a headed stud with deformations on the shaft. Typically they thread the end of a reinforcing bar and screw on a "hockey puck" The development length is much shorter than a typical rebar and because of the deformations on the shaft it is shorted than a nelson stud. They are very useful when you are trying to develop beam reinforcing at an exterior concrete column. They reduce congestion. I have used them a couple of time with great success. The contractors were thrilled to have less congestion. The ones I've used were provided by ERICO.

 

[Qrs]

Typically they thread the end of a reinforcing bar and screw on a "hockey puck"

So it seems you are comparing a typical rebar to a rebar with the additional "hockey puck" headed stud.

http://www.erico.com/public/library/concrete/lt0434.pdf

I am asking about the deformed bar anchor and how is it different from typical rebar. ie: you have a #4 rebar vs a 1/2" DAS....no "hockey puck" on either. Are they interchangeable? What makes them different?

 

[ztengguy]

I think normally the deformation is a 'inny', instead of a 'outy' and its weldable properties.

 

[TXStructural]

ASTM A496 is deformed wire, not specifically used for this purpose, and still subject to limitations regarding weldability. A615 is standard rebar, which is not specifically weldable, but may be weldable based on chemistry and conditions of welding. A706 is weldable rebar (also with higher ductility and with a cap on strength.)

A DBA (deformed bar anchor) is simply a piece of deformed steel bar or wire, which is welded onto a plate or other embed, and the bar develops using standard ACI development criteria. In order to rely on ACI computations for development, the deformations must meet the relevant ASTM for deformed bar or wire for concrete reinforcement.

Plates or other embeds can be anchored by DBA or stud, and the two behave differently in concrete.

 

[Qrs]

Thanks TX. Your explanation and Section 3.5.3 in the ACI code explained it quite clearly. As a follow up, what is a typical application for deformed wire (ASTM A496) besides WWR?

 

[TXStructural]

Deformed wire can be used any place deformed rebar can be used. It is seldom used in straight lengths, aside from specialty manufacturing. Because making it requires additional processing (drawing to size and then cold rolling deformations), it seldom is economical to use when hot rolled rebar is available. There can also an issue with ductility (low) and yield strength (high), as well as yield/tensile spread (narrow), for some uses.