General Information

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

Suspension bridge.
Suspension bridge over a river
Type Single-span suspension bridge
Main span ≅ 100 m
Deck width ≅ 2 m
Deck width to main span ratio ≅ 1:50
Pylon Reinforced concrete (H-shaped)
Girder Timber transverse beam

Pylon Deformation

Figure 2 shows the pylon top-region on shore 1.

Pylon top-region.
Top region of an H-shaped pylon

The main cable inclination α differs from β. Figure 3 shows the pylon on shore 1.

Pylon deformation

The yellow vertical line represents a straight axis, while the double yellow arrow marks the pylon-top horizontal displacement d.

  • Can α and β be a possible cause for the horizontal displacement d?
  • Main Cable Anchorage

    Figure 4 shows a main cable anchorage.

    Main cable anchorage.
    Front view Enlarged front view
    Main cable anchorage

    The main cable is connected to nine short looped cables; each of them is connected to a pulley wheel.

  • What are the main problems?
  • Stringers

    Figure 5 shows a main span sector viewed from above.

    Main span.
    Main span timber deck

    The deck consists of timber boards, which are connected to the stringers by carriage bolts, washers, and nuts. Figure 6 shows a main span sector viewed from below.

    Main span.
    Timber boards to stringer connection
  • Does the carriage bolt size and layout affect the structural behavior of the stringers?