Design of Embed Plates in concrete beams

[ec29]

I have the usual references for design of embed plates in concrete walls, concrete slabs but how do you design an embed with headed studs into a concrete beam. The embed is used to conect a steel beam with a very large reaction (concrete breakout won't work). The plate is as deep as the concrete beam.

 

[hokie66]

AELLC,
Your sketch represents one truss analogy for distributing the concentrated force along the beam, but there are other solutions which don't require inclined bars. Your sketch is lacking some of the hanging stirrups, as some are going to be required between and in close proximity to the shear studs.

 

[Ron]

JAE read my mind...torsion.

 

[ec29]

Hokie, should all the hanging stirrups be surrounding the headed studs or close to them? It seems that the legs of the stirrups on the other side of the beam (away from the embed) wouldn't be very effective.

 

[hokie66]

Yes, that is fundamental. You only count the legs of the stirrups at the loaded edge, and these should be in addition to any other stirrups required due to beam action. In the British standard which you referenced, the hanging tension reinforcement provided by these stirrup legs is called "surface reinforcement". Refer to Page 20 of that standard, which has the rules for placement and a sketch showing the concept, Figure 9.