What is Embed plate in steel structure

An Embed Plate in steel structure is a rectangular piece of steel with welding studs attached that have a head bigger than the stud’s diameter. In this article you will learn the basic of embed plates which are necessary to detail in Tekla structures.

When constructing steel buildings or structures, various elements such as plates, angles, bolts, anchor rods, and other attachments need to be embedded or attached to the steel framework for the overall stability and functionality of the structure. Embeds add reinforcement and strength to the structure by holding the steel in place and providing an attached surface for other reinforcements.

Fig 1: Embed plate structural detail

The fig. 1 shows embed plate connection detail, in which embed plate is provided in tilt-up wall for deck support angle connection.

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Purpose of Embed plates

Purpose of an embed plate is to transfer load from steel framing to concrete wall / foundation. Headed studs are welded on embed plates to provide shear and axial resistance.

Embed plates are essential for ensuring the stability and integrity of a building or structure by securely anchoring load-bearing elements to the foundation or other structural elements. They come in various shapes and sizes, depending on the specific application and engineering requirements of the project.

Key items to be consider :

When the Engineer of Record decides to fasten structural steel to a concrete wall using an embedded plate, several factors must be carefully evaluated. 

Few points outlined below, connections to embedded plates will be addressed on a job-by-job basis. It is the responsibility of the detailer to manage this to avoid delays in the drafting schedule.

a) Type of connection: What specific connection will be used to attach the structural steel to the embedded plate (e.g., shear tab, single-sided clip angle, WT section, double clip angles, etc.)?

b) Shipping method: How will the connection materials be shipped (e.g., loose, attached to the supported member, or a combination of both)?

c) Shipping timing: When will the connection materials ship (e.g., in advance of erection, with the supported steel, or a combination of both)?

d) Tolerance requirements: Assess the required tolerances to maintain proper alignment. The use of long slots and washer plates may be considered to accommodate these needs.  

Nailer holes in embed plate

Nailer holes are provided on embed plate to secure it in position while concrete is cast. Fig. 2 shows (4) 5/16" diameter holes at the corners of embed plate.

Fig. 2: Embed plate with nailer holes

FAQS

First: What is Nailer holes size in embed plate?

  Usually, 5/16″ diameter holes are provided in embed plates.

Second: What is the grade of studs welded to embed? 

   The material grade of studs is ASTM A108.

Third: What is the thickness of embed plate?              Normally, 1/2″ or 3/4″ thick plate is used.

Conclusion

In steel detailing, the term "embed plate" refers to a steel plate that is embedded or attached to a structural steel component, typically a column or beam, to facilitate its connection to other structural elements or to the foundation.