Headed stud anchors

Equation (D-I9) is for cast-in headed stud anchors. It is based on the fixity of the anchor to the embedment and is appropriate for use in designing anchors welded to embedded plates. 

Furche, J., and R. Eligehausen (1991), Lateral Blowout Failure of Headed Studs Near a Free Edge, Anchor is Concrete Design and Behavior, SP 130, American Concrete Institute Farmington Hills, MI. 

This chapter provides the basic materials, properties, and corrosion protection recommendations for holt and rod assemblies, headed studs, post-installed anchors, and shear lugs. The engineer must select the proper material, considering properties such as grade, yield strength, tensile strength and weldability and provide for corrosion resistance so that the anchorage will perform as required and intended. 

Steel embedded plates are often used to transfer loads from structural members to concrete structures or foundations. Such plates are often cast-in-place for constructability and to provide a smooth surface for attachment. These plates are attached to the concrete with welded anchors, which typically consist of headed studs, headed anchors, weldable rebar, or shear lugs they can be designed to resist applied tension, shear, and moment. Welding should be compatible with the anchor type. 

AWS Dl.l/Dl.lM requires studs to be Type B made from cold drawn bar stock conforming to ASTM A108. Since headed studs are relatively short, it is not practical to consider reinforcing steel in design as might be the case with longer anchors. 

Headed anchor rods may be used in heu of headed studs to increase the embedment and assure ductile design, or if studs are not available. Design is similar to that for headed studs. The user must ensure that the anchor rod is made of a weldable material. 

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