This paper presents a numerical study on the nonlinear behaviour of steel-timber floor members incorporating cross-laminated timber slabs, timber beams and shield anchor bolt shear connectors. Focused monotonic pushout tests were conducted to characterise shear connection stiffness, load capacity, and ductility. These were used to calibrate a piecewise constitutive model to capture the full load slip response, which was then adopted for shear connection modelling. Steel-timber floor nonlinear simulations included members with spans of 9 m, 12 m, and 15 m under four-point bending. The models included different connector densities (180-720 mm spacing) and were benchmarked against tie-constraint (full interaction) and bare steel cases. As expected, the moment capacity increased with connector density. The results showed that moment resistance ratios ranged from 0.59 to 0.86 of the full interaction case, with connector forces reaching up to 48% of capacity at service and 93% at the predicted moment resistance. The study shows that for studied configurations, the composite action is governed by shear connector performance, leaving steel and timber underutilised. This supports adoption of shear connection-based design approaches with strict connector utilisation limits, particularly for adaptable and reusable systems.