## 3 Optimization on Reasonable Constructing State for Cable-Stayed Bridge with Steel Box Girder
### Finite Element Model and Construction Stages
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Serial** & **Construction State** & **Serial** & **Construction State** \\ \hline
1 & \
\begin{tabular}{c} Construct the transition piers, auxiliary piers, \\ and pylons \\ \end{tabular} & 58–72 &
\begin{tabular}{c} Install steel box girder Ai and Ji (\(i=18,\cdots,22\)), \\ then tension cables \\ \end{tabular} \\ \hline
2 & \
\begin{tabular}{c} Assemble the brackets near pylons \\ \end{tabular} & 73 &
\begin{tabular}{c} Deck derrick cranes move forward \\ \end{tabular} \\ \hline
3 & Install steel box girder sections near pylons & 74 &
\begin{tabular}{c} Install steel box girder section AH2, complete the \\ closure operation of side span \\ \end{tabular} \\ \hline
4 & \
\begin{tabular}{c} Consolidate girder and pylons \\ \end{tabular} & 75 &
\begin{tabular}{c} Construct the permanent weights of the second \\ phase onto steel box girder section located on top \\ of auxiliary piers and side span \\ \end{tabular} \\ \hline
5 & \
\begin{tabular}{c} Tension cables A1 and J1 \\ \end{tabular} & 76 &
\begin{tabular}{c} Dismantle deck derrick cranes of side span \\ \end{tabular} \\ \hline
6 & \
\begin{tabular}{c} Dismantle brackets near pylons \\ \end{tabular} & 77 &
\begin{tabular}{c} Install steel box girder section J23 \\ \end{tabular} \\ \hline
7 & \
\begin{tabular}{c} Assemble deck derrick cranes \\ \end{tabular} & 78 &
\begin{tabular}{c} Tension cables A22 and J22 \\ \end{tabular} \\ \hline
8 & \
\begin{tabular}{c} Install steel box girder sections A3 and J3 \\ \end{tabular} & 79 &
\begin{tabular}{c} Deck derrick cranes of mid span move forward \\ \end{tabular} \\ \hline
9 & \
\begin{tabular}{c} Tensioning cables A2 and J2 \\ \end{tabular} & 80 &
\begin{tabular}{c} Install steel box girder section JH, complete the \\ closure operation of mid span \\ \end{tabular} \\ \hline
10 & \
\begin{tabular}{c} Deck derrick cranes move forward \\ \end{tabular} & 81 &
\begin{tabular}{c} Inspection cars move back to pylons and \\ transition piers \\ \end{tabular} \\ \hline
11–27 & \
\begin{tabular}{c} Install steel box girder sections Ai and Ji \\ \((i=4,\cdots,9)\), then tension cables Aj and Jj \\ \((j=4,\cdots,9)\) \\ \end{tabular} & 82 &
\begin{tabular}{c} Install permanent supports between girder \\ and pylons \\ \end{tabular} \\ \hline
28 & \
\begin{tabular}{c} Construct temporary piers, deck derrick cranes \\ move forward \\ \end{tabular} & 83 &
\begin{tabular}{c} Dismantle temporary consolidation between \\ girder and pylon \\ \end{tabular} \\ \hline
30–52 & \
\begin{tabular}{c} Install steel box girder sections Ai and Ji \\ \((i=10,\cdots,17)\), then tension cables Aj and Jj \\ \((j=9,\cdots,16)\) \\ \end{tabular} & 84 &
\begin{tabular}{c} Dismantle deck derrick cranes of mid span \\ \end{tabular} \\ \hline
53 & \
\begin{tabular}{c} Install steel box girder section A18 onto temporary \\ supports near auxiliary piers \\ \end{tabular} & 85 &
\begin{tabular}{c} Dismantle temporary piers \\ \end{tabular} \\ \hline
54 & \
\begin{tabular}{c} Deck derrick cranes move forward \\ \end{tabular} & 86 &
\begin{tabular}{c} Dismantle horizontal braces of pylon \\ \end{tabular} \\ \hline
55 &
\begin{tabular}{c} Install steel box girder section AH1, complete the \\ closure operation of secondary side span \\ \end{tabular} & 87 & Install wind noses onto steel box girder \\ \hline
56 & \
\begin{tabular}{c} Dismantle temporary supports near auxiliary piers \\ \end{tabular} & 88 &
\begin{tabular}{c} Impose secondary dead loads \\ \end{tabular} \\ \hline
57 & \
\begin{tabular}{c} Construct the permanent weights of the first phase \\ onto steel box girder section A18, which located on \\ top of auxiliary piers \\ \end{tabular} & 89 &
\begin{tabular}{c} Construct the permanent weights of the second \\ phase onto steel box girder section located on top \\ of auxiliary piers and side span \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Construction stages of Xiangshan Port Bridge.