## 4 Analysis of Bridge Deformation Characteristics
### Dynamic Deformation Characteristics of the Fenghuangshan Road Bridge Based on GB-RAR Technology
#### 4.2.2 Dynamic Deformation Characteristics of the Bridge Based on Digital Photography Technology  
Based on the remote monitoring of close-range photogrammetry technical equipment, which is acquired using high-speed bridge photos, the displacement data at mid-span (deformation point 3), 1/4 span (deformation points 2 and 4), and 1/8 span (deformation points 1 and 5) of the bridge were extracted and processed, and the local position and overall deformation time series curves of the bridge were designed (Figures 25-27). The displacement data are illustrated in Tables 2-4. Figure 25: Deflection deformation time series curve of the bridge. (**a**) Deflection deformation time series curve of bridge local position; (**b**) overall deformation of the bridge at different times. Figure 27: Deflection deformation time series curve of the bridge. (**a**) Deflection deformation time series curve pertaining to the local position of the bridge; (**b**) overall deformation of the bridge at different times. Figure 26: Deflection deformation time series curve of the bridge. (**a**) Deflection deformation time series curve pertaining to the local position of the bridge; (**b**) overall deformation of the bridge at different times. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Time Series**} & **Deformation** & **Deformation** & **Deformation** & **Deformation** & **Deformation** \\  & **Point 1** & **Point 2** & **Point 3** & **Point 4** & **Point 5** \\ \hline
196 & \(5.73\) & \(-3.05\) & \(11.01\) & \(10.13\) & \(7.39\) \\
197 & \(1.29\) & \(-6.73\) & \(14.11\) & \(10.98\) & \(8.72\) \\
198 & \(1.92\) & \(-18.05\) & \(19.72\) & \(17.52\) & \(12.49\) \\
199 & \(6.03\) & \(-6.82\) & \(16.74\) & \(15.31\) & \(12.61\) \\
200 & \(2.37\) & \(-4.76\) & \(8.08\) & \(7.11\) & \(5.96\) \\
201 & \(-4.79\) & \(-5.28\) & \(-5.38\) & \(-5.58\) & \(-4.26\) \\
202 & \(5.04\) & \(0.46\) & \(4.97\) & \(2.8\) & \(3.5\) \\
203 & \(1.02\) & \(-6.61\) & \(10.99\) & \(9.96\) & \(8.62\) \\
204 & \(-0.53\) & \(-12.9\) & \(18.12\) & \(14.37\) & \(6.63\) \\
205 & \(1.92\) & \(-3.07\) & \(1.98\) & \(-0.05\) & \(-0.67\) \\
206 & \(2.98\) & \(0.39\) & \(3.9\) & \(2\) & \(-0.08\) \\
207 & \(2.08\) & \(-15.13\) & \(24.56\) & \(20.46\) & \(15.15\) \\
208 & \(5.37\) & \(-7.98\) & \(18.45\) & \(16.95\) & \(14.08\) \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Deflection deformation of deformation points under different time series (mm). \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Time Series**} & **Deformation** & **Deformation** & **Deformation** & **Deformation** & **Deformation** \\  & **Point 1** & **Point 2** & **Point 3** & **Point 4** & **Point 5** \\ \hline
121 & \(-0.39\) & \(-14.92\) & \(8.35\) & \(7.01\) & \(1.24\) \\
122 & \(6.1\) & \(-11.59\) & \(22.49\) & \(18.82\) & \(13.12\) \\
123 & \(-0.39\) & \(-21.98\) & \(21.52\) & \(20.86\) & \(11.53\) \\
124 & \(-4.33\) & \(-12.27\) & \(2.35\) & \(-0.43\) & \(0.46\) \\
125 & \(4.73\) & \(-5.26\) & \(13.52\) & \(10.64\) & \(9.11\) \\
126 & \(11.14\) & \(-3.9\) & \(25.88\) & \(24.25\) & \(19.19\) \\
127 & \(2.21\) & \(-4.65\) & \(11.26\) & \(6.68\) & \(3.8\) \\
128 & \(4.95\) & \(0.47\) & \(3.01\) & \(2.65\) & \(1.55\) \\
129 & \(1.06\) & \(-8.54\) & \(6.06\) & \(3.12\) & \(3.38\) \\
130 & \(-0.68\) & \(-12.05\) & \(10.39\) & \(9.01\) & \(3.06\) \\
131 & \(-4.67\) & \(-3.14\) & \(-8.6\) & \(-10.07\) & \(-8.91\) \\
132 & \(8.98\) & \(-8\) & \(18.45\) & \(16.96\) & \(10.48\) \\
133 & \(3.63\) & \(-1.63\) & \(6.25\) & \(5.83\) & \(2.67\) \\
134 & \(3.5\) & \(-9.84\) & \(20.74\) & \(17.19\) & \(11.76\) \\
135 & \(0.93\) & \(-12.51\) & \(16.2\) & \(12.8\) & \(7.94\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Deflection deformation of deformation points under different time series (mm). Figure 25a depicts the overall bridge deformation trend at the 1-15 time series; the maximum deformation of the bridge occurs at 5 o'clock; deformation of point 3 is 28.9 mm and that of point 4 is 24.69 mm.