# Load Testing and Analysis of a Large Span Through Simply-Supported Steel Box Arch Bridge
## 4 Static Load Test
### Strain Measurement Point Locations and Measurement Method
#### 4.3.3 Loading Conditions and Wheel Position Arrangement
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Condition** & **Test Item** & **Design Effect** & **Loading Effect** & **Loading Efficiency** \\ \hline \multirow{7}{*}{1} & A-A Section (Arch Rib L/2 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{806.58} & \multirow{2}{*}{778.61} & \multirow{2}{*}{0.97} \\  & (Medium Load) & & & \\  & A-A Section (Arch Rib L/2 Section) Maximum Deflection Effect (Medium Load) & & & \\  & D6 Hanger Maximum Cable Force Increment (Medium Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{2241.31} & \multirow{2}{*}{2141.13} & \multirow{2}{*}{0.96} \\  & (Medium Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Axial Force Effect (Medium Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Deflection Effect (Medium Load) & & & \\  & A-A Section (Arch Rib L/2 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{897.41} & \multirow{2}{*}{827.99} & \multirow{2}{*}{0.92} \\  & (Eccentric Load) & & & \\  & A-A Section (Arch Rib L/2 Section) Maximum Deflection Effect (Eccentric Load) & & & \\  & D6 Hanger Maximum Cable Force Increment (Eccentric Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{2502.73} & \multirow{2}{*}{2215.12} & \multirow{2}{*}{0.89} \\  & (Eccentric Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Axial Force Effect (Eccentric Load) & & & \\  & D-D Section (Tie Beam L/2 Section) Maximum Deflection Effect (Eccentric Load) & & & \\  & B-B Section (Arch Rib L/4 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{1242.50} & \multirow{2}{*}{1200.94} & \multirow{2}{*}{0.97} \\  & (Medium Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{3272.06} & \multirow{2}{*}{2953.29} & \multirow{2}{*}{0.90} \\  & (Medium Load) & & & \\  & B-B Section (Arch Rib L/4 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{1388.99} & \multirow{2}{*}{1320.09} & \multirow{2}{*}{0.95} \\  & (Eccentric Load) & & & \\  & B-B Section (Arch Rib L/4 Section) Maximum Deflection Effect (Eccentric Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Positive Bending Moment Effect & \multirow{2}{*}{3654.82} & \multirow{2}{*}{3136.33} & \multirow{2}{*}{0.86} \\  & (Eccentric Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Axial Force Effect (Medium Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Deflection Effect (Medium Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Axial Force Effect (Eccentric Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Axial Force Effect (Eccentric Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Deflection Effect (Eccentric Load) & & & \\  & C-C Section (Tie Beam L/4 Section) Maximum Deflection Effect (Eccentric Load) & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Loading test conditions. working with similar steel box arch bridge structures, understanding these static responses is crucial. Under centered loading, the bridge exhibits a relatively symmetrical internal force distribution, representing uniform stress. This condition is important for assessing the overall stability of the bridge. Eccentric loading conditions, however, reveal the bridge's response to asymmetric loads, particularly the stress concentrations that may occur in localized areas. Therefore, examining these static responses under different conditions provides valuable insights for the design and assessment of similar structures, particularly when analyzing real-world stress scenarios throughout the bridge's service life. (2) Wheel Position Arrangement  
The bridge is a bidirectional structure with eight lanes. During the application of uniform loads, the test vehicles are evenly distributed across each lane in both the eastbound and westbound directions. For the application of eccentric loads, all vehicles are arranged in the eastbound lanes of the bridge.