#8x3 screw. Pull out strength 1

[dgkhan]

Does any body have a freeware or spread sheet per ACI 318 to find out the pull out strength of #8 screw embedded 1.5” in the concrete. Also what will be the diameter for #8 screw?

 

[Lion06]

I made a very slick spreadsheet for app D. It was intended for headed studs and anchor rods with nuts/plates, but can be used with anything if you give Ase and Abrg. If you let me know that and the material strengths I can give you an answer.

 

[dgkhan]

can you send me that slick spread sheet. you can upload here

 

[Lion06]

Sorry, I can't.
I made it for my company - it took about 60 hours to put together. It does a full bolt group analysis (for eccentric loads), and even has a 40 page handout complete with examples.
If you post your info I can help you out.

 

[dgkhan]

Actually that is also part of my question. I do not know it's diameter etc.Assume footing to be 12" wide continuous wall ftg.

 

[Lion06]

going by the wood screw properties in NDS the Ase is 0.01347 in^2. Assume 36 ksi yield and 58 ksi tensile strength, the capacity would be 583#. This assumes that you have 1.5" embed and the head is large enough to ensure pullout doesn't control.

 

[Lion06]

I should say that is a factored load (I assumed that went without say since we're talking about ACI 318, but just wanted to throw that out there).

 

[hokie66]

One problem with trying to do this is that small screws like this can be made of anything. Unless it is a trusted and controlled source, I wouldn't like to depend on it as anything other than a nominal fixing.

 

[COEngineeer]

I would think you can find this info from the manufacture. Specify titen screw for example. Titen is a simpson product that you can use through concrete. It will give you minimum edge distance to make sure it follows appendix D.

Never, but never question engineer's judgement

 

[dgkhan]

Cross check with this sheet also by Alex T. If I am involved in some problem as engineer, I will also like to dig in ...

 

[dgkhan]

sorry posted reply to wrong thread