General Information

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

Cable-stayed bridge.
Cable-stayed bridge over a river.
Type Single-span cable-stayed bridge
Main span ≅ 130 m
Deck width ≅ 2 m
Girder Steel twin I-girder
Pylon Reinforced concrete (A-longitudinal shaped)
Stay cable arrangement Radial (two cable planes)

Girder Deformation

Figure 2 shows a side view of a main span sector viewed from shore 1.

Main span.
I-girder deformation of a cable-stayed bridge viewed from shore 1.

I-girder deformation near shore 2 is noticeable. Figure 3 shows the deformed region viewed from shore 2.

Main span.
I-girder deformation of a cable-stayed bridge viewed from shore 2.
  • What are some possible deformation causes?
    What are the main structural consequences?
  • Lateral Cables

    Figure 4 shows a schematic partial three-dimensional view of a bridge sector.

    Three-dimensional view.
    Three dimensional drawing of a cable stayed bridge sector with lateral cables.

    The bridge has four lateral cables (two per side) and two external foundations per shore. Figure 5 shows two lateral cables viewed from the mid-span region.

    Lateral cables.
    Two lateral cables of a cable stayed bridge.

    The lateral cables are sagging. A main span and a shore connection are shown in figure 6.

    Lateral cables connections.
    Main span Shore (external foundation)
    Connection between lateral cable and I-girder, and connection between lateral cable and shore.
  • What is the purpose of the lateral cables?
    Does the bridge have a structural safety or serviceability problem without the lateral cables?
  • Anchorages

    Figure 7 shows the bridge entrance on shore 1.

    Bridge entrance.
    Cable stayed bridge entrance.

    Anchorages A and B are shown in figures 8 and 9, respectively.

    Anchorage A.
    Main cable anchorage using embedded U-anchors.

    The U-anchors are embedded in concrete.

    Anchorage B.
    Front view Back view
    Anchorage with damaged concrete.

    The concrete is damaged, and the embedded U-anchor length is reduced.

  • Does the damaged concrete influence the structural behavior of the bridge?