An ongoing collaborative research project is studying the structural integrity of steel gravity framing systems composed of steel beams and girders with composite slab on metal deck. Experimental data has already been obtained at the component level for the behavior of the gravity connections and the composite slab during loading consistent with column removal. Half-scale floor system tests that include interior, exterior, and corner column loss scenarios are presently being conducted. These combined experimental data are now being used to evaluate the assumptions made in the various modeling approaches to simulate column removal in steel gravity frames. Subassembly models have been created to validate against the component level tests, and the lessons learned are being extended to system level modeling. Suggestions for further model refinement are made.