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Embed Plate using ACI 318-05 App D

Embed Plate using ACI 318-05 App D

Embed Plate using ACI 318-05 App D

I am trying to apply the equations and rules from ACI 318-05 App D to design embed plates in concrete walls for steel beam shear connections. I am using 3/4" headed studs welded to the embed plate and I have assumed that the plate only receives a shear load.

Does anyone have any example calculations or spreadsheet/mathcad printouts that I could use to see some of these calculations in "action"?


RE: Embed Plate using ACI 318-05 App D

I think that the PCA's "Notes on ACI 318..." is a much underrated reference for all concrete design tasks.

RE: Embed Plate using ACI 318-05 App D

Thanks for the tip Rowing. I have ACI 318-05 but not ACI 318-08, so I'm not too sure that I want to try Web App from your link. I looked at the free programs from Hilti, Simpson and Powers.

Jed, Does the "PCA notes on 318" have any commentary and examples worked out for Embed plates with shear (App D)?

I would still like to see some worked examples if anyone could upload some that would fit my problem. An example with a side edge would be nice.

RE: Embed Plate using ACI 318-05 App D

The PCA document (the last edition I have which is for 318-02) has examples worked out for headed anchor stud plates in tension. But at least one of the shear cases involves tension allowable (pry out).  And if you're not near an edge, that usually controls.  

RE: Embed Plate using ACI 318-05 App D

ACI 349.2R-07, "Guide to the Concrete Capacity Design (CCD) Method - Embedment Design Examples" has several examples.

RE: Embed Plate using ACI 318-05 App D

Are the calculations in 349.2-07 consistent with 318 App D? If so, I may pick this up.

RE: Embed Plate using ACI 318-05 App D

Yes, it is consistent with ACI 318-05. Since 349 lags behind 318, it may be a while before any of the changes in  ACI 318-08 are incorporated.

This is the table of contents FYI:

PART A—Examples: Ductile single embedded
element in semi-infinite concrete
Example A1—Single stud, tension only, no edge effects
Example A2—Single stud, shear only
Example A3—Single stud, combined tension and shear
Example A4—Single bolt, combined tension and shear

PART B—Examples: Ductile multiple embedded
elements in semi-infinite concrete
Example B1(a)—Four-stud embedded plate, tension only, wide spacing
Example B1(b)—Four-stud embedded plate, tension only, close spacing
Example B1(c)—Four-bolt surface-mounted plate, tension only, close spacing, close to a corner
Example B2(a)—Four-stud embedded plate, combined shear and uniaxial moment
Example B2(b)—Four-anchor surface-mounted plate, combined shear and uniaxial moment
Example B3—Four-threaded anchors and surfacemounted plate, combined axial, shear, and moment
Example B4(a)—Four-stud embedded plate in thin slab, tension only
Example B4(b)—Four-stud rigid embedded plate in thin slab, tension only

RE: Embed Plate using ACI 318-05 App D

If you have a shear plate welded to this embed plate for your beam connection, and it is bolted to the web of the beam, you will have eccentricity of the reaction which will induce a small moment into the embed connection. Many engineers assume the tension is resisted by the top row or two of headed studs only, and check these for combined shear and tension. This often can control the design of the entire connection so consider it right away in your design...

RE: Embed Plate using ACI 318-05 App D

Thanks! I should probably add 2" of eccentricity to my shear load.

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