Shear flow composite steel beam and concrete slab

[Enhineyero]

Connection between built-up steel members is usually taken from shear flow calculation (VQ/I), calculate the stress and check if weld thickness is adequate.

However, the connection between a steel beam and concrete slab (composite action) via a shear stud is calculated differently - by taking bending tension flange force (instead of VQ/I). Was wondering why is this is and why is vertical shear is not considered?

 

[Settingsun]

What code are you referring to? Your profile says Australia and the Australian bridge code uses VQ/I. Regardless, it should fundamentally be based on the change in flange force.

 

[Agent666]

The averaging of the longitudinal/interface shear over the full shear span due in part because some deformation of the studs and crushing of the concrete being considered acceptable. Usually 6mm seems to be the practical limit based on testing, the stud capacity equations are determined on this basis.

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