General Information

Figure 1 shows a suspension bridge that is used by vehicles up to 1.5 tons and pedestrians.

Suspension bridge.
Suspension bridge over a river.
Type Single-span suspension bridge
Main span ≅ 140 m
Deck width ≅ 2.5 m
Deck width to main span ratio ≅ 1:56
Pylon Reinforced concrete truss
Girder Steel transverse beam


Figure 2 shows a pylon.

Reinforced concrete truss pylon.

The pylon consists of a reinforced concrete truss. Figure 3 shows a schematic partial three-dimensional view of the used pylon and an H-shaped one with saddles.

Used pylon H-shaped pylon with saddles
Three dimensional drawing of a truss pylon and an H-shaped pylon with saddles.
  • What are the main problems of the used truss pylon?
    Is the used pylon required for structural efficiency reasons?
  • Hanger Cable to Girder Connection Failure

    Figure 4 shows a schematic partial cross-section of the bridge.

    Cross section of a suspension bridge.

    Hanger cable and girder are connected by a hooked rebar and an end-plate; girder, end-plate, and hooked rebar are joined by welding. Figure 5 shows a hanger cable to girder connection.

    Hanger cable to girder connection.
    Connection between hanger cable and girder.

    Figure 6 shows a failed hanger cable to girder connection.

    Hanger cable to girder connection failure.
    Failed connection  between hanger cable and girder.

    The hooked rebar failed; the failure point is located in the hook region.

  • What are some possible failure reasons?
    Does this failure affect the bridge safety?