General Information
Figure 1 shows a cable-stayed bridge that is used by motorcycles, bicycles and pedestrians.
| Type | Single-span cable-stayed bridge |
| Main span | ≅ 90 m |
| Deck width | ≅ 2.5 m |
| Girder | Steel twin I-girder |
| Pylon | Reinforced concrete (A-longitudinal shaped) |
| Stay cable arrangement | Radial (two cable planes) |
Pylon's Shape
Figure 2 shows a side view of a pylon.
A reinforced concrete slab delimits the upper unit with the bottom unit. Figure 3 shows a schematic partial three-dimensional view of the used pylon and an H-shaped one.
| A-longitudinal shaped | H-shaped |
What are some possible reasons for using the above shown A-longitudinal shaped pylon instead of an H-shaped pylon?
Pylon's Lateral Stay Cables
Figure 4 shows a side view of a pylon.
Each pylon has two lateral stay cables (one per side); each cable is anchored to the pylon top region and an external foundation, which consists of a pile cap and two piles. The same foundation type (pile cap and piles) is used for the pylon. Figure 5 shows a schematic partial three-dimensional view of the pylon with lateral stay cables and foundations.
The pylon top region and the external foundation anchorages are shown in figure 6.
| Pylon top region | External foundation |
The pylon top region is anchored by an additional cable, while the external foundation is anchored by a turnbuckle and an additional cable.
Pylon's Reinforced Concrete Slab
Figure 7 shows a side view of the pylon region.
The slab cantilevers on each side, and the cantilever longitudinal arm a ≅ 1 m. The I-girder of the approach span is connected to the slab in the cantilever free-end region. Figure 8 shows a schematic partial three-dimensional view of the pylon region.
The approach span s ≅ 10 m.