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RE: Concrete floor joist HELP

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These are typical inversed U joist-n-slab precast concrete floor system which was customary at a time.
The oddity is that rather than a single joist rib, the joist appeare to be formed as two separate ribs.  They are about 2 1/4" in width, 3" center to center, and tapered on each side with a single big rebar in the bottom of each rib and no apparent stirrups.  The ribs seemed to join in the middle as each one tapered up, and the overall spacing between these joints was about 24".