# Load Transfer Efficiency Based on Structural Deflection Assessment of the Precast Floating Track
## 5 Results and Discussion
### Load Case I  
In this Load case, the loads were set up at the center of 2 nd panel to verify the maximum bearing capacity as well as the maximum deflection of the structures. Table 4 shows the vertical displacement measurement results for the three-panel precast floating slab track, which was mounted on a 60 K continuous rail with a central loading point (2/4 loading point) compare with the FEA results. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Classification** & **Unit** & **Specification** \\ \hline \multirow{4}{*}{\begin{tabular}{c} Rail \\ (KR60) \\ \end{tabular} } & Moment of inertia & mm\({}^{4}\) & 30,640,000 \\ \cline{2-4}  & Section modulus & mm\({}^{3}\) & 395,000 \\ \cline{2-4}  & Modulus of elasticity & MPa & 210,000 \\ \cline{2-4}  & Coefficient of thermal expansion & \(1/^{\circ}\)C & \(1.14\times 10^{-5}\) \\ \hline \multirow{4}{*}{\begin{tabular}{c} Fastening \\ system \\ \end{tabular} } & Type & \multicolumn{2}{c}{System 300-1} \\ \cline{2-4}  & Width & mm & 160 \\ \cline{2-4}  & Length & mm & 290 \\ \cline{2-4}  & Static stiffness (Vertical direction) & kN/m & 28,734 \\ \cline{2-4}  & Dynamic stiffness (Vertical direction) & kN/m & 32,770 \\ \cline{2-4}  & Static stiffness (Lateral direction) & kN/m & 40 \\ \cline{2-4}  & Dynamic stiffness (Lateral direction) & kN/m & 60 \\ \hline \multirow{4}{*}{\begin{tabular}{c} Precast \\ concrete slab (ladder type) \\ \end{tabular} } & Thickness & mm & 300 \\ \cline{2-4}  & Width & mm & 900 \\ \cline{2-4}  & Length & mm & 4925 \\ \cline{2-4}  & Modulus of elasticity & MPa & 35,684 \\ \cline{2-4}  & Compressive strength & MPa & 45 \\ \cline{2-4}  & Poison’s coefficient & - & 0.18 \\ \cline{2-4}  & Coefficient of thermal expansion & \(1/^{\circ}\)C & \(1.0\times 10^{-5}\) \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} Anti-vibration \\ device \\ \end{tabular} } & Static stiffness & kN/m & 22,500 \\ \cline{2-4}  & Stability stiffness (longitudinal direction) & kN/m & 18,000 \\ \cline{2-4}  & Stability stiffness (lateral direction) & kN/m & 18,000 \\ \hline \multirow{4}{*}{
\begin{tabular}{c} Crossbeam \\ \end{tabular} } & Modulus of elasticity & MPa & 35,684 \\ \cline{2-4}  & Compressive strength & MPa & 45 \\ \cline{2-4}  & Poison’s coefficient & - & 0.18 \\ \cline{2-4}  & Coefficient of thermal expansion & \(1/^{\circ}\)C & \(1.0\times 10^{-5}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Specification of track system. Figure 10 shows the vertical deflections of the panel, and the relative deflections of the right rail, which were measured in Load case I when applying loads in the center of the 2 nd panel (2/4 loading point). As shown in Figure 5a, under monotonic loads of 150 to 440 kN, the vertical displacement of the panel occurred between 1.08 to 3.62 mm, when the sensor was installed in the center of the panel. However, on the right-side sensor the displacement of panel changed from 0.54m to 1.96 mm and this data on the left-side was increased from 0.69 to 2.13 mm, so that the average vertical deflection value varied from 0.77 to 2.57 mm. This is because of the greater the load, the greater the vertical displacement. The estimated support stiffness of the six anti-vibration devices under the slab was calculated by divided the load by the average deflection and determined to be 28.53-32.47 kN/mm, which is slightly bigger than the value of the original design. Due to the load was applied in the center of three panels, the displacement of the panels in Figure 10a and the displacement of the rails in Figure 10b can be compared with others. As can be seen in Figure 10a,b, the loads were transmitted and distributed to three panels through the rails. However, even if the loads from 150-440 kN were applied in the 2 nd panel, the vertical displacement only occurred in the central panel and this value of the left and right panel was exceedingly small. This situation was also the same for rail displacement.