## 4 Analysis Results
### Failure of Deck Substrate at Discontinuous Dimension in Section (FSD)
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Description**} & \multicolumn{2}{c}{**Maximum Stress (MPa)**} & \multicolumn{2}{c}{**Design Strength \({}^{*}\)**} & \multicolumn{2}{c}{**F.S.**} \\ \cline{3-8} \multicolumn{1}{c}{} & \multirow{2}{*}{FX} & \multicolumn{1}{c}{**LC1**} & **LC2** & **(MPa)** & **LC1** & **LC2** \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} Serviceability limit \\ state \\ (SLS) \\ \end{tabular} } & \multirow{2}{*}{FX} & \multicolumn{1}{c}{Tension} & 35.7 & 27.7 & 46.2 & 1.29 & 1.67 \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-36.7}\) & \(\mathbf{-29.0}\) & \(\mathbf{-32.6}\) & **0.89** & 1.12 \\ \cline{2-8}  & \multirow{2}{*}{SS} & \multicolumn{1}{c}{Tension} & 35.9 & 30.6 & 46.2 & 1.29 & 1.51 \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-37.4}\) & \(\mathbf{-27.4}\) & \(\mathbf{-32.6}\) & **0.87** & 1.19 \\ \hline \multirow{4}{*}{
\begin{tabular}{c} Ultimate limit state \\ (ULS) \\ \end{tabular} } & \multirow{2}{*}{FX} & \multicolumn{1}{c}{Tension} & **64.2** & **49.9** & 46.2 & **0.72** & **0.93** \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-66.1}\) & \(\mathbf{-52.1}\) & \(\mathbf{-32.6}\) & **0.49** & **0.63** \\ \cline{3-8}  & \multirow{2}{*}{SS} & \multicolumn{1}{c}{Tension} & **64.5** & **55.1** & 46.2 & **0.72** & **0.84** \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-67.3}\) & \(\mathbf{-49.2}\) & \(\mathbf{-32.6}\) & **0.48** & **0.66** \\ \hline \hline \end{tabular}
\end{table} 
Table 16: Maximum tensile and compressive stresses at the corner between the flange and web. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multicolumn{2}{c}{**Description**} & \multicolumn{2}{c}{**Maximum Stress (MPa)**} & \multicolumn{2}{c}{**Design Strength \({}^{*}\)**} & \multicolumn{2}{c}{**F.S.**} \\ \cline{3-8}  & & \multicolumn{1}{c}{**LC1**} & **LC2** & **(MPa)** & **LC1** & **LC2** \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} Serviceability limit \\ state \\ (SLS) \\ \end{tabular} } & \multirow{2}{*}{FX} & \multicolumn{1}{c}{Tension} & 32.0 & 29.1 & 48.4 & 1.51 & 1.66 \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-36.2}\) & \(\mathbf{-26.4}\) & \(\mathbf{-50.3}\) & 1.39 & 1.91 \\ \cline{3-8}  & & \multicolumn{1}{c}{Tension} & 32.3 & 29.0 & 48.4 & 1.50 & 1.67 \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-34.3}\) & \(\mathbf{-25.1}\) & \(\mathbf{-50.3}\) & 1.47 & 2.00 \\ \hline \multirow{4}{*}{
\begin{tabular}{c} Ultimate limit state \\ (ULS) \\ \end{tabular} } & \multirow{2}{*}{FX} & \multicolumn{1}{c}{Tension} & **57.8** & **52.1** & 48.4 & **0.84** & **0.93** \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-65.2}\) & \(\mathbf{-47.1}\) & \(\mathbf{-50.3}\) & **0.77** & 1.07 \\ \cline{3-8}  & & \multicolumn{1}{c}{Tension} & **58.2** & **52.0** & 48.4 & **0.83** & **0.93** \\ \cline{3-8}  & & \multicolumn{1}{c}{Compression} & \(\mathbf{-62.0}\) & \(\mathbf{-44.8}\) & \(\mathbf{-50.3}\) & **0.81** & 1.12 \\ \hline \hline \end{tabular}
\end{table} 
Table 15: Maximum tensile and compressive stresses at the stepped lap joint in the flange. Figure 23: Contour of compressive and tensile stresses near the loading area under LC1 and FX in ULS.