General Information

Figure 1 shows a hybrid cable-stayed suspension bridge that is used by motorcycles, bicycles and pedestrians.

Hybrid cable-stayed suspension bridge.
Hybrid cable-stayed suspension bridge over a river.
Type Single-span hybrid cable-stayed suspension bridge
Main span ≅ 75 m
Deck width ≅ 2 m
Girder Steel twin I-girder
Pylon Reinforced concrete (A-longitudinal shaped)
Stay cable arrangement Radial (two cable planes)

Arrangement of Stay and Hanger Cables

Figure 2 shows a schematic three-dimensional view of the main span.

Three-dimensional view.
Three-dimensional view of a hybrid cable-stayed suspension bridge.

The main span girder is connected to 6 hanger cables and 16 stay cables. The former have about a constant spacing (s), while the latter have a shorter spacing in the mid-span region, as shown in figure 3.

Mid-span region.
Mid-span region of a hybrid cable-stayed suspension bridge.

Fifty percent of the stay cables (8 cables) and two hanger cables are installed in the mid-span region.

  • What is the structural purpose of the above shown arrangement of stay and hanger cables?
  • Stay Cable Vibration

    Figure 4 shows a schematic lateral view of the bridge.

    Lateral view.
    Lateral view of a hybrid cable-stayed suspension bridge.

    Video 1 shows stay cable 1 during hand-induced vibration.

    Video 1. Stay cable 1 during hand-induced vibration.
  • How much load does stay cable 1 carry?