huangyhg

embed plates with dba
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.
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.
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?
i think that more people are probably familiar with studs than dba's. i use both!
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.
seit:
you didn't post the detail... no link, nothing.
mike mccann
mmc engineering
shoot, my mistake. it's a very simple detail.
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
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

have you considered an arrangement like this?
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.

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