Embed Plates with DBA

[slickdeals]

Folks,
Why is it that not a lot of people use embed plates with DBA (deformed bar anchors) and get away from using Appendix D, and use embed plates with headed studs.

I would appreciate your inputs.

 

[Lion06]

I actually use rebar welded to embed plates if I can't get headed studs to work out with App. D. I have 4 details in a rather small job I'm working on now that required rebar welded to the embed plate because HCA just wouldn't work.

 

[slickdeals]

Do you know if there is a cost-implication with DBA's? I am wondering why even use a headed-stud and have to go through the craziness of appendix D when all you need is a few reinforcing bars well developed. Would you mind posting a pdf of your detail?

 

[jike]

I think that more people are probably familiar with studs than DBA's. I use both!

 

[Lion06]

Here's a fairly generic detail I just sketched. I'm not comfortable posting a detail from an actual job. We also have in our general notes that rebar that is to be welded must be ASTM A706 (I think that's the right designation), and that E90XX electrodes are required. Also, the ld should say ldh. There is obviously a lot of detailing left off, but it gets the embed plate with rebar detailing across.

 

[msquared48]

SEIT:

You didn't post the detail... No link, nothing.

Mike McCann
MMC Engineering

 

[Lion06]

Shoot, my mistake. It's a very simple detail.

 

[msquared48]

I have ysed similar details in the past, but included a small bearing flange at the top to help with the load to the rebar. Usually the flange is 1 to 2" long.

However, for whatever reason, the poster has an afterset condition to deal with here which is a totally different animal.

Mike McCann
MMC Engineering

 

[sandman21]

DBA cost a little than HSA, A706 rebar and extra prep. when welding. You can also use threaded rebar again cost is more than HAB. Appex. D is not bad once you develop rebar to take the breakout.

I still have a trick I want to run by a plan checker, embed a HSA 26". Appex. D applies to embed's less than 25" kicking you out of Appex D. Then I can use old code equations to justify allowable values. lol

 

[rowingengineer]

have you considered an arrangement like this?

http://www.actech.com.au/facast.htm

I only use these as an example and would suggest you do your own enquires as to suitability.


When in doubt, just take the next small step.

 

[csd72]

rowingengineer,

We used to use this type of thing all the time for precast industrial buildings in melbourne. The original company that made these did testing on them to verify the calculations.

Two things you need to consider. Firstly, the mesh needs to be cut to fit the rebar 'handles'. Secondly, you should thread a few bars through the 'handles' on the opposite side of the mesh to anchor it in.

We also had our own engineer do some calculations to verify it.

 

[rowingengineer]

I believe the company you are talking about is RJB, Yes i probably should have posted their info, but i couldn’t find their website, or the info i have on file for them.

When in doubt, just take the next small step.

 

[csd72]

Yes thats them.

Last time I looked they didnt have a website.

 

[asixth]

I didn't know there was an off the shelf cast-in baseplate product. I recently called up a fabricated design with 12dia reo (No.4 bar) welded to a 20mm baseplate (3/4") similar to SEIT sketch for a 160mm slab (6.5") where I was having trouble with concrete cover and punching shear.

 

[rowingengineer]

asixth give RJB a call you should be able to get there number from the NPCAA. They have a nice manual.

When in doubt, just take the next small step.