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Plate cast into wall....

Plate cast into wall....

Plate cast into wall....

(OP)
I'm trying to determine the capacity of a plate cast into a concrete grade beam (wall).  The plate is 10"x1/2"x15", there are (8) 3/4"dia x 5" HD studs on the back of the plate that extend deeper into the wall.

The plate is mounted vertically (parallel with the face of the wall).  See rough sketch (beam not shown)... studs: "=", plate: "#"

   -------
  (        )
  (   ==#
  (   ==#
  (   ==#
  (   ==#
  (        )
  (        )
  (        )
   -------

The plate is used to support a beam that is welded it.  I have checked the capacity of the welds but I also want to check the capacity of the plate.

How does one determine the capacity of the plate "sketched" above??  If this is covered in ACI or LRFD code please point me to the correct section.

All comments appreciated. TIA!

---
Andrew

RE: Plate cast into wall....

I call it a "zip" connection (because it can unzip) and you have freely downloadable various sheets in the Mathcad Collaboratory site of Mathsoft, Civil Engineering folder that deals with this case.

The sheets are based in ACI 349-2R-89 / 1994 that deals with these things. There are others based in PCI Manual 5th edition that has also information on plate connections to concrete.

RE: Plate cast into wall....

DMWWEngr,

I think you will find exactly what you need in the PCI Design Handbook (I have the 5th edition).  Chapter 6 is on the design of connections.  Section 6.5 has design criteria and examples for design of Welded Headed Studs on embedded plates.  Otherwise, you might check out manufacturer's information (such as Nelson), which should include the design criteria.

~dison

RE: Plate cast into wall....

You can also get a design booklet prepared by TRW Nelson called "embedment properties of headed studs".

Basically, you have to determine the capacity in TENSION AND SHEAR of the critical stud - usually one of the top studs.  Then, you determine the applied tension and shear on that critical stud.  Nelson provides a unity equation:

[V(applied)/(V(cap.)x(safety factor)]^(5/3)  +  
        T(applied)/(T(cap.)x(safety factor)^(5/3) <= 1.0

Call - 216-329-0400 (they are in Elyria, Ohio)
www.nelsonstud.com/

Also...ACI's new 318-02 has a nifty section in the back on embedded stud design.

RE: Plate cast into wall....

(OP)
Thanks,

Got my Nelson booklet on the way.  Too bad that section didn't make it in ACI 318-99.  I will have to add those two books to my growing list of books to buy!!  :)

Thanks again everybody,

---
Andrew

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