## 3 Methodology
### Technical Condition Assessment
#### 3.1.2 Inspection Index Evaluation
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Inspection Object** & **Inspection Index** & **Scale** & **Qualitative Description** & **Quantitative Description** \\ \hline \multirow{8}{*}{Side beam, intermediate beam} & & 2 & Slightly uneven & Elevation difference \(\leq\) 15 mm \\  & Evenness & 3 & Obviously uneven, local fractures occur & 15 mm \(<\) spacing \(\leq\) 30 mm \\  & Evenness & 4 & Excessively uneven, vehicle bumping, and side sinking occur & 30 mm \(<\) spacing \(\leq\) 100 mm \\  & & 2 & Slightly narrow & 50 mm \(<\) spacing \(\leq\) design value \\  & Spacing & 3 & Obviously narrow & 10 mm \(<\) spacing \(\leq\) 50 mm \\  & & 4 & Excessively narrow or wide & Spacing \(>\) design value, or spacing \\ \hline \multirow{8}{*}{Bearing system} & & 2 & Local anchor bolts are unfixed, local hanger & Proportion of unfixed bolts \(\leq\) 10\%, or 1 hanger damage \\  & Bol looseness, hanger & 3 & Multiple anchor bolts are unfixed, multiple & 10\% \(<\) proportion of unfixed bolts \(\leq\) \\  & damage & & hanger damages occur & 30\%, or 2 hanger damages \\  & & 4 & Massive anchor bolts are unfixed, massive & Proportion of unfixed bolts \(>\) 30\%, or \\  & & & hanger damages occur & hanger damages \(>\) 2 \\ \hline \multirow{8}{*}{Displacement control system} & & 2 & Serious spring deformations occur, local & Spring deformation \(>\) 20\% design \\  & & 3 & bolts are unfixed, local hinges are damaged & value, or proportion of unfixed bolts \(\leq\) \\ \cline{1-1}  & Spring deformation, & & 10\%, or 1 hanger damage \\ \cline{1-1}  & bolt looseness, hinge & & 10\%, or 10\% \(<\) proportion of unfixed bolts \(\leq\) \\ \cline{1-1}  & damage & & Multiple springs are damaged, massive & 30\%, or 2 hanger damages \\ \cline{1-1}  & & 4 & bolts are unfixed, massive hinges are & Proportion of damaged springs 10\%, or \\ \cline{1-1}  & & & damaged & \\ \hline \end{tabular}
\end{table} 
Table 3: Inspection index evaluation the BECI of MB modular type. \begin{table}
\begin{tabular}{c c c c} \hline \hline
\begin{tabular}{c} Serious fractures occur \\ \end{tabular} & Fractures \(>\) 5, damaged area \(>\) 30\% \\ \end{tabular}
\end{table} 
Table 4: Inspection index evaluation of the BECI of SC comb plate type BECI. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**Inspection Object** & **Inspection Index** & **Scale** & **Qualitative Description** & **Quantitative Description** \\ \hline \multirow{4}{*}{Elastic support} & \multirow{4}{*}{Support deformation} & 2 & \multirow{4}{*}{Slight support deformations occur} & Support deformations \(\leq\) allowable value \\  & & 3 & Obvious support deformations occur & Support deformations \(>\) allowable value \\  & & 4 & \begin{tabular}{c} Serious support deformations occur \\ \end{tabular} & Proportion of damaged supports \(>\) 30\% \\ \hline \multirow{4}{*}{Anchorage concrete} & \multirow{4}{*}{Fracture} & 2 & Local fractures occur & Fractures \(\leq\) 3, fracture width \(\leq\) 2 mm, damaged area \(\leq\) 10\% \\  & & & 3 \(<\) fractures \(\leq\) 5, 2 mm \(<\) fracture \\  & & & & total area \\ \cline{1-1}  & & & 3 \(<\) fractures \(\leq\) 5, 10\% \(<\) damaged area \\ \cline{1-1}  & & 4 & \begin{tabular}{c} Serious fractures occur, anchorage function fails \\ \end{tabular} & \
\begin{tabular}{c} Fractures \(>\) 5, fracture width \(>\) 10 mm, damaged area \(>\) 20\% \\ \end{tabular} \\ \hline \multirow{4}{*}{Rubber sealing tape} & \multirow{4}{*}{Aging} & 2 & \multirow{4}{*}{Slightly aging, local fractures occur} & Fractures \(\leq\) 3, damaged area \(\leq\) 20\% \\  & & 3 & Obviously aging, multiple fractures occur & 3 \(<\) fractures \(\leq\) 5, 20\% \(<\) damaged area \\ \cline{1-1}  & & 4 &
\begin{tabular}{c} Excessively aging, serious fractures occur \\ \end{tabular} & Fractures \(>\) 5, damage area \(>\) 50\% \\ \hline \hline \end{tabular}
\end{table} 
Table 3: _Cont_.