concrete insert design

[trivedi123]

I have to design male and female concrete epoxy inserts with tension and shear load applied at top of anchors. Do I need to check the wall of outer insert for shear.

 

[jayrod12]

A sketch would go a long way in helping explain the situation. perhaps with some dimensions and loading.

 

[KootK]

Interesting question. I would say no, the outer insert does not need to be designed for shear. I see the outer insert as primarily acting as vertical base plates of sorts, transferring shear induced compression forces to the concrete.

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.

 

[TehMightyEngineer]

I second the sketch comment.

Professional Engineer (ME, NH, MA) Structural Engineer (IL)
American Concrete Industries

http://www.americanconcrete.com

 

[trivedi123]

Thank you all.
I am trying to get more information about the insert requirement from field.
All I have is 8" 3000psi concrete slab with "4 @12" , 4" from top. the load on insert at top of slab is 8K tension and 8.5K shear. This will be post installed insert and trying to use per Hilti insert.

 

[KootK]

If you're using a Hilti insert, then you just have to follow their design recommendations which wouldn't explicitly consider outer insert shear.

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.

 

[trivedi123]

I don't have to use Hilti. It requires 12" embedment that I don't have it. existing slab is only 8"

 

[jayrod12]

You may be hard pressed to find a solution in that case unfortunately. If Hilti is requiring 50% more embedment than you possible have (and don't forget they require there to be concrete left below their anchor) I don't see this working as a single insert.

We're going to need a more accurate description of the application in order to help you further. As it currently stands, I'm still not totally sure what we're talking about.

 

[MotorCity]

Any type of post installed epoxy anchors, inserts, etc that I have ever seen are a proprietary product. As such, pick up a catalog or go online and see if there are shear capacities or requirements given for the product you are using. Also, many of the capacities for these type of products are the result of testing with a healthy safety factor applied, so you would not be able to check it anyway.

 

[trivedi123]

Thanks for all the help. I think I started this without all the information required.
I am trying get full picture of the problem. Thanks

 

[KootK]

You're most welcome. While I applaud the DIY spirit, few things in structural engineering are as problematic as the accurate, first principles engineering of the small. Testing's usually the gold standard.

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.

 

[bones206]

If this project is required to comply with the IBC, the anchors should be designed in accordance with ACI 318 Appendix D in conjunction with the ICC Evaluation Report associated with the specific anchor product you are using. All of the applicable design requirements and procedures will be covered in those documents.

 

[trivedi123]

Bones206,
Thanks
Yes. I am using ACI 318 appendix D.