composite slab shear capacity

[apsix]

Does anyone have experience in design for both vertical and longitudinal shear for composite slabs?
By composite slabs I mean a precast concrete plank, acting as self supporting formwork, with a insitu concrete topping slab.
Commercially manufactured composite slabs usually don't have shear connectors, relying on the concrete bond only. How would this affect vertical shear capacity?

 

[Lion06]

Typically, the plank has 2" - 3" of topping which puts the horizontal shear plane near the top of the composite section. The shear flow (horizontal shear) is greatest at the center and decreases as you move toward the top and bottom of the composite section.
As a result, the horizontal shear required for composite action is usually small enough that the coefficient of friction from ACI will suffice. I believe it is 1.0 for for concrete placed against hardened concrete that is intentionally roughened - that is why they rake the top, to get a good bond between the topping and the plank.

 

[Galambos]

check PCI Section 4.3.5, although this might be different depending on which edition you have. it modifies ACI 318 since the topping isnt roughened to ACI 318's requirements. it will give the capacity for the shear transfer.