# Experimental Study on Ice Melting of Bridge Tower Crossbeams under Different Conditions
## 3 Results and Discussion
### Crossbeam Ling Test
#### 3.1.2 Effect of Wind Speed on Crossbeam Icing  
The physical diagram of the crossbeam icing in condition 4 (ambient temperature \(-15\)\({}^{\circ}\)C, wind speed 4.5 m/s) is shown in Figure 15, from which it can be seen that the icicles on the crossbeam have a certain inclination due to the wind speed, and the length and thickness of the icicles increase compared with condition 3 (ambient temperature \(-15\)\({}^{\circ}\)C, wind speed 0 m/s), while the side ice coverage of the crossbeam reaches 80%  
Figure 12: Physical view of the beam icing at different ambient temperatures and the corresponding bar chart of the length of the ice column. \(\mathbf{(a_{1})}-5\)\({}^{\circ}\)C physical view of the beam icing. \(\mathbf{(a_{2})}-5\)\({}^{\circ}\)C ice column bar graph. \(\mathbf{(b_{1})}-10\)\({}^{\circ}\)C physical view of the beam icing. \(\mathbf{(b_{2})}-10\)\({}^{\circ}\)C ice column bar graph. \(\mathbf{(c_{1})}-15\)\({}^{\circ}\)C physical view of the beam icing. \(\mathbf{(c_{2})}-15\)\({}^{\circ}\)C ice column bar graph. Figure 13: Ice coverage on the side of the crossbeam. and the side ice thickness of the crossbeam increases by 2 cm compared with condition 3. The test results show that the length and thickness of the crossbeam ice column increases with increasing wind speed and that the thickness of the crossbeam side ice layer becomes thicker with increasing wind speed, thus making it more difficult to de-ice. As can be seen in Figure 16, the length of the ice columns on the beam varies and the distribution of the long and short ice columns is irregular. When the wind speed is applied, the lateral ice coverage of the beam is 80%, but the thickness of the lateral ice on the beam becomes thicker. In addition, the ice column tilts due to the wind, with a tilt angle of approximately 30\({}^{\circ}\) at a wind speed of 4.5 m/s. A comparison of the test results for condition 3 and condition 4 is shown in Table 6, where the maximum, minimum, and average lengths of the crossbeam ice column increase by 9 cm, 8 cm, and 7.78 cm, respectively. The corresponding growth rates are 36%, 66.67%, and 41.92%, respectively. The results show that the application of wind speed results in longer and larger diameter columns of ice on the crossbeam, thicker ice on the sides of the crossbeam, and a certain  
Figure 14: Variation of each dimension of the icicle with ambient temperature. Figure 15: Ambient temperature –15 °C, wind speed 4.5 m/s: physical view of crossbeam icing. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Ambient Temperature**} & \multirow{2}{*}{\begin{tabular}{c} **Maximum Length of** \\ **Iclele** \\ **(cm)** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **Minimum Length of** \\ **(cm)** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Average Length of** \\ **(ICicle)** \\ **(cm)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Ice Thickness on the** \\ **(ICicle)** \\ \end{tabular} } \\  & & & & \\ \hline \(-5\) & 13 & 5 & 8.63 & 0.3 \\ \(-10\) & 20 & 8 & 13.58 & 0.6 \\ \(-15\) & 25 & 12 & 18.56 & 1.0 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Crossbeam icicle dimensions at different ambient temperatures. inclination of the columns, which means that the effect of wind speed is greater than the effect of ambient temperature and more attention should be paid to the effect of wind speed changes on the de-icing of the crossbeam and the prevention of icing. The crossbeam icing tests revealed that different ambient temperatures and wind speeds have an effect on the distribution of ice columns on the sides of the crossbeam. The thickness of ice on the side of the beam was linearly related to the ambient temperature and wind speed; the higher the wind speed, the greater the thickness of ice on the side of the beam, and similarly, the lower the temperature, the greater the thickness of ice on the side of the beam. The ice thickness on the side of the crossbeam increases with both increasing wind speed and decreasing temperature.