Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Plate cast into wall....

Plate cast into wall....

Plate cast into wall....

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!


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....


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.


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)

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

RE: Plate cast into wall....


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,


Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now
White Paper - Medical Device Design Control
Medical device product development is a highly integrated and regulated process. Implementation of a requirements tracking solution requires attention to a variety of nuanced topics. When presented with the task of tracking the many concept relationships in a project of this type, the initial software solution of choice tends to be a two-dimensional text systems. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close