## 2 Previous Experimental Work Used for FEM
### Test Data on Slim Floor Assemblies  
Various tests were conducted and reported on slim floor assemblies addressing their thermal and structural response in fire (thermo-mechanical). These tests were conducted by different research agencies and industries including Warrington Fire Research Centre (WFRC) and British Steel. The test assemblies used by WFRC and British Steel during their experimental program consisted of rolled asymmetric slim floor beam (ASB) sections and composite slabs. The composite slab of the floor was constructed using deep steel decking and normal weight concrete. Among various others, tests WFRC-66162 and WFRC-67756 were conducted to study the thermal and thermo-mechanical response of asymmetric slim floor beams against standard fire exposure, are used in this study. Test WFRC 66162 was conducted on 14 February 1996 on a slim floor beam assembly (ASB assembly) 5000 mm long with a 4500 mm span between supports. The tested specimen consisted of an ASB 280 rolled steel beam section and a composite slab constructed using Comfor-210 deep steel decking and normal weight concrete as shown in Figure 1. The nominal depth and width (provided by the manufacturer) of the test assembly were 308 mmand 950 mm, respectively. The steel beam section used was 280 mm deep with top and bottom flanges 180 mm and 280 mm wide, respectively. The nominal distance between the flanges was 244 mm from their inner edges. The thickness of the steel section was 18 mm for the flanges and the web. A layer of concrete, 28 mm deep, reinforced using A-142 steel mesh provided near the finished top surface of the test specimen. Dimensions of the steel section were found to be slightly different from the nominal ones as presented in Table 1.  
Once the dimensions of the ASB were recorded, the tensile strength of structural steel was also investigated which was 402 MPa. This 402 MPa was higher than the tensile strength provided by the manufacturer which was 355 MPa. Further details on this test can be found in a technical note published by British Steel [16]. Comprehensive instrumentation was done to measure temperatures and deformations during the test using 153 K-type thermocouples and linear variable differential transformers (LVDTs) positioned at various locations along the length of the test assembly. These thermocouples were installed at thirteen different locations along the length of the steel section. Additional 30 thermocouples were used to record temperatures in concrete and at 3 locations on the steel docking. Vertical deflections of ASB assembly were measured using LVDTs at six locations along its length including one at the mid-span. External loads were applied at four locations through hydraulic rams positioned 1125 mm apart as shown in Figure 1b. The imposed load of 84.6 kN at each point, in addition to the self-weight of the beam assembly, induced a bending moment of 198.81 kNm which represented a degree of utilisation of 0.423 when compared with the capacity at ambient temperatures of test assembly [16]. Under this load, the test assembly was estimated to achieve a 60 min \begin{table}
\begin{tabular}{c c c c c c} \hline  & & \multicolumn{2}{c}{**WFRC 66162**} & \multicolumn{2}{c}{**WFRC 67756**} \\
**S \#** & **Description** & **Provided** & **Recorded** & **Provided** & **Recorded** \\  & & **(mm)** & **(mm)** & **(mm)** & **(mm)** \\ \hline
1 & Depth of ASB & 280 & 279 & 304 & 305.8 \\
2 & Width of Top Flange & 180 & 183 & 190 & 198 \\
3 & Width of Bottom Flange & 280 & 280 & 300 & 306 \\
4 & Average thickness of Top Flange & 18 & 16.6 & 20 & 21.7 \\
5 & Average thickness of Bottom Flange & 18 & 18.4 & 20 & 20.6 \\
6 & Thickness of steel Web & 18 & 19.5 & 18 & 17.2 \\ \hline \end{tabular}
\end{table} 
Table 1: Geometric properties of steel sections, WFRC 66162. Figure 1: The Tested Specimen WFRC 66162, (**a**) Elevation; (**b**) Loading conditions; (**c**) Section at AA\({}^{\prime}\); (**d**) Section at BB’. based on the results from analysis if the enhanced action between steel and concrete was ignored.