General Information

Figure 1 shows a pedestrian suspension bridge.

Suspension bridge.
Suspension over a creek
Type Single-span suspension bridge
Main span ≅ 9 m
Deck width ≅ 0.6 m
Pylon Timber log
Girder Bamboo transverse beam


Figure 2 shows the pylon on shore 1.

Suspension bridge pylon (shore 1).
Pylon made of a timber log

The pylon is made of a timber log, and the base is embedded in the ground. The main cables (made of ropes) pass over the branch bark ridge and are tied on a fallen tree. A bamboo pole is used for the lateral deviation of the two main cables. Figure 3 shows the pylon on shore 2.

Suspension bridge pylon (shore 2).
Pylon made of a timber log

The main cables also pass over the branch bark ridge; in contrast to shore 1, the ropes are tied to a steel wire rope that is anchored on a RC block. The steel wire rope termination consists of U-bolt clamps. Figure 4 shows a main span sector.

Main span.
Bamboo pole deck

The deck consists of five bamboo poles placed side-by-side that are tied together by ropes. The hanger cables (also made of ropes) are tied to the girders and deck's external poles. Figure 5 shows the bridge entrance on shore 1.

Bridge entrance shore 1.
Entrance of a pedestrian suspension bridge

The first hanger cable set is tied to the deck's external poles; no girder is installed in that region. The abutment consists of a single sandbag. Figure 6 shows a schematic three-dimensional view of the suspension bridge.

Three-dimensional view.
Three-dimensional drawing of a suspension bridge
  • How efficient is the suspension system?
    How simply and precisely can the bridge's structural behavior be predicted?
  • Figure 7 shows the suspension bridge.

    Suspension bridge.
    Pedestrian suspension bridge over a creek

    The height from the deck to the sandy creek bed (h) is about 0.8 m. Figure 8 shows a schematic three-dimensional view of the bridge and a variant that uses a mid-span support consisting of sandbags instead of the suspension system.

    Used variant and two-span continuous beam bridge variant.
    Three-dimensional drawings of a suspension and a beam bridge
  • What are the main problems of the two-span continuous beam bridge variant?
    Which variant is probably more efficient?