A706 weldable rebar vs. Nelson D2L Deformed Bar Anchors (DBAs)

[abusementpark]

I'm trying to get a good feel on the difference between these two products and when one should be used over the other.

I was assuming that Nelson DBAs behave the same as regular rebar with equivalent deformations to that required by ASTM A615. However, attached is their product data page and it is not very clear. It simply states that "Nelson deformed bar anchors deliver full tension capacity when embedded according to code requirements and provide specified shear strength when embedded at proper edge distances and spacing between bars." However, it does not say that the bars are equivalent to ASTM A615.

It does say that it meets the requirements of ACI 318, but not which requirements exactly. It does say that the bending of the bars is per ACI 318, leading you to think it behaves like rebar. It doesn't say if these would designed per the development concept of ACI 318, or per the anchorage concept using ACI Appendix D.

Anyone got any ideas?

 

[humanengr]

I would say the Nelson D2L product is not qualified for design based on the development concept of ACI 318.
The Nelson Data sheet you attached does not indicate conformance to the ASTM Specifications listed in ACI 318 - Section 3.5.3.1. Therefore, it is not qualified to be used as "re-bar" per ACI 318.

With regard to Appendix D, based on the product data sheet you attached, D2L does not appear to meet the requirements stated in ACI D.2.3. If that is the casee, it would not qualify for design under ACI App. D, with the possible exception of J-Hooks meeting the requirements for Hooked Bolts per App. D.

I suggest contacting the manufacturer and asking them to clarify the statments made on their data sheet and whether they have testing meeting the requirements of ACI.

 

[abusementpark]

I am waiting on a response from the manufacturer.

I've seen these DBAs used quite often, so I thought someone here might know the exact difference.

 

[KootK]

Please report back if you get this sorted out. I use DBA's all the time and always assumed that they were interchangeable with weldable rebar.

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.

 

[JAE]

Deformed bar anchors (at least from Nelson) are ASTM A496 material (low carbon mild steel) with an Fy = 70 ksi and an Fu = 80 ksi. The ICC ESR is ESR-2907 found here:

http://www.icc-es.org/Reports/pdf_files/ESR-2907.pdf

A706 bars are a low alloy steel and come in two minimum yield strength levels: 60 ksi and 80 ksi, designated as Grade 60 and Grade 80, respectively. We typically use the grade 60.

A summary of A706 (an abstract) can be found here:

http://www.astm.org/Standards/A706.htm

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