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.
Main span: ≅ 80 m
Deck width: ≅ 4 m
Pylon: Steel trusses (H-shaped)
Girder: Steel transverse beam
Stay cable arrangement: Radial (two cable planes)

Suspension System

Figure 2 shows a schematic lateral view of the bridge.

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

The suspension system consists of stay cables, tie cables, and hanger rods. Figure 3 shows a side view of a main span sector.

Main span.
Side view of a hybrid cable-stayed suspension bridge.

The load path of the suspension system is shown in figure 4.

Load path.
Load path of a hybrid cable-stayed suspension bridge

The mid-span stay cables S1 and/or S2 are always used as a load path. Load A is transferred to the the pylons and anchorages by hanger rod H1 and stay cables S1 and S2; load E is transferred by hanger rod H8, stay cable S6, four tie cables, and stay cable S1. Figure 5 shows the bridge in the mid-span region.

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

The mid-span node is shown in figure 6.

Mid-span node.
Structural mid-span node.

The stay and tie cables' end fittings consist of closed bridge sockets, and the hanger rods are U-shaped. The forces are transferred by four plates and two pins. The remaining nodes are arranged as shown in figure 7.

Node.
Structural node.

The forces are transferred by a single pin.

  • What are the main pros and cons of the used suspension system?