## 3 Validation of the Simplified Design Method
### Parametric Study on Asymmetric Double-T Cross-Section
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c} \hline \hline \begin{tabular}{c} **Sieel** \\ **Profile** \\ **Type\({}^^{1}\)** \\ \end{tabular} & \begin{tabular}{c} **Sieb** \\ **Type\({}^^{1}\)** \\ \end{tabular} & \begin{tabular}{c} **h** \\ **Type\({}^{1}\)** \\ \end{tabular} & \begin{tabular}{c} **b\({}_{\text{m}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **b\({}_{\text{m}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c\({}_{\text{m}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c\({}_{\text{c}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c\({}_{\text{c}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c** \({}_{\text{c}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c** \({}_{\text{c}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c** \({}_{\text{c}}\)** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **c** \({}_{\text{m}}\)** \\ **(mm)** \\ \end{tabular} & \
\begin{tabular}{c} **b\({}_{\text{m}}\)** \\ **(mm)** \\ \end{tabular} &
\begin{tabular}{c} **u\({}_{\text{r}}\)** \\ **(mm)** \\ \end{tabular} \\ \hline IFB & 2 & 180 & 400 & 170 & 12.7 & 15 & 8 & 60 & 8 & 2 & S335 & C25/3 & 4 & 25 & 37.5 & 37.5 \\ \hline IFB & 2 & 180 & 320 & 170 & 12.7 & 20 & 8 & 120 & 8 & 2 & S460 & C50/60 & 4 & 20 & 40 & 45 \\ \hline IFB & 2 & 180 & 320 & 170 & 12.7 & 25 & 8 & 40 & 8 & 2 & S275 & C50/60 & 2 & 32 & 34 & 34 \\ \hline IFB & 1 & 180 & 400 & 170 & 12.7 & 20 & 8 & 120 & 8 & 2 & S225 & C30/37 & 4 & 16 & 42 & 32 \\ \hline IFB & 1 & 180 & 320 & 170 & 12.7 & 30 & 8 & 120 & 8 & 2 & S275 & C50/60 & 2 & 25 & 37.5 & 37.5 \\ \hline IFB & 1 & 180 & 320 & 170 & 12.7 & 20 & 8 & 120 & 8 & 2 & S460 & C40/50 & 2 & 25 & 37.5 & 37.5 \\ \hline IFB & 1 & 180 & 400 & 170 & 12.7 & 20 & 8 & 90 & 8 & 2 & S460 & C50/60 & 4 & 20 & 40 & 40 \\ \hline IFB & 1 & 180 & 400 & 170 & 12.7 & 20 & 8 & 90 & 8 & 2 & S425 & C50/60 & 4 & 14 & 42 & 37 \\ \hline SB & 2 & 376 & 300 & 180 & 24 & 24 & 13.5 & 40 & 12 & 3 & S460 & C40/50 & 4 & 25 & 37.5 & 47.5 \\ \hline SB & 2 & 376 & 300 & 180 & 24 & 24 & 13.5 & 40 & 12 & 3 & S355 & C25/30 & 0 & - & - & - \\ \hline SB & 2 & 376 & 300 & 180 & 24 & 24 & 13.5 & 80 & 12 & 3 & S460 & C50/60 & 4 & 32 & 34 & 44 \\ \hline SB & 2 & 376 & 300 & 180 & 24 & 24 & 13.5 & 120 & 12 & 3 & S275 & C30/37 & 4 & 25 & 37.5 & 47.5 \\ \hline SB & 1 & 376 & 300 & 180 & 24 & 24 & 13.5 & 40 & 12 & 3 & S355 & C40/50 & 4 & 20 & 32 & 34 & 44 \\ \hline SB & 1 & 376 & 300 & 180 & 24 & 24 & 13.5 & 80 & 12 & 3 & S460 & C25/30 & 2 & 32 & 34 & 44 \\ \hline SB & 2 & 301 & 310 & 200 & 39 & 39 & 21 & 40 & 8 & 1.5 & S355 & C50/60 & 4 & 25 & 37.5 & 37.5 \\ \hline SB & 2 & 301 & 310 & 200 & 39 & 39 & 21 & 40 & 8 & 1.5 & S355 & C50/60 & 4 & 32 & 34 & 39 \\ \hline SB & 2 & 301 & 310 & 200 & 39 & 39 & 21 & 60 & 8 & 1.5 & S355 & C30/37 & 2 & 16 & 42 & 42 \\ \hline SB & 2 & 301 & 310 & 200 & 39 & 39 & 21 & 40 & 8 & 1.5 & S355 & C40/50 & 4 & 25 & 37.5 & 32.5 \\ \hline SB & 2 & 301 & 310 & 200 & 39 & 39 & 21 & 80 & 8 & 1.5 & S460 & C50/60 & 4 & 25 & 37.5 & 37.5 \\ \hline SB & 1 & 301 & 310 & 200 & 39 & 39 & 21 & 70 & 8 & 1.5 & S355 & C50/60 & 2 & 32 & 34 & 34 \\ \hline SB & 1 & 301 & 310 & 200 & 39 & 39 & 21 & 100 & 8 & 1.5 & S460 & C40/50 & 4 & 20 & 40 & 40 \\ \hline SB & 1 & 301 & 310 & 200 & 39 & 39 & 21 & 40 & 8 & 1.5 & S355 & C25/30 & 2 & 25 & 37.5 & 37.5 \\ \hline SB & 1 & 301 & 310 & 200 & 39 & 39 & 21 & 40 & 8 & 1.5 & S355 & C25/30 & 2 & 25 & 37.5 & 37.5 \\ \hline \hline \end{tabular} \({}^{1}\) Type No. 1 represents a prefabricated slab with in-situ concrete; Type No. 2 represents solid concrete slab.  
\end{table} 
Table 5: _Cont._The situation is different in the cases of R90 and R120, as the temperature along the web is substantially increased, in particular in the lower part of the web. This is the reason why the simplified method leads to conservative values for longer fire exposures, up to a difference of about 40%. Figure 11: Assessment of the studied configurations with composite behavior: (**a**) Gauss curve, (**b**) boxplot assessment.