Concrete Slab bearing on Steel Beams using STAAD.Pro V8i SELECTseries 6

I am trying to perform an analysis on an existing two-way concrete slab supported on each side by deep concrete grade beams using STAAD. 

Background Info:

As part of a rehab project, a large section of the two-way slab needs to be cut-out and replaced; but the floor needs to remain operational during repairs.  As such, steel beams will be placed directly underneath the bottom of the slab around the cut-out and connected to the deep concrete grade beams.  In order to make the repairs easier and cheaper, the slab will sit directly on-top of the steel beams without any attachments between the two to resist negative (upward) bending of the slab. 

STAAD Model Info:
I have modeled the concrete grade beams and the steel beams as well as 1'x1' plate elements (XZ Plane) representing the 12" thick slab.  I used the offset command to set the top of the steel beams equal to the top of the concrete beams.  Each beam has a node every 1' which sits directly underneath a corresponding plate/slab node.  All of the slab/plate element nodes are 6" above the beam nodes in the Global Y direction to represent the center of slab elevation.


Is it possible to connect the concrete slab plate nodes to the steel beam nodes using the Master-Slave Command in the FY direction?

I am concerned about using this command because the slab is only bearing on the steel.  I do not want the STAAD analysis to assume a composite connection with studs that would cause the steel beam to bend upwards with the slab in regions of negative moment.  I only want the master-slave command to function in the (-)FY direction.  Possible?


Would the appropriate master-slave command be RIGID to connect the existing slab which is doweled into the existing grade beams?