General Information

Figure 1 shows a pedestrian beam bridge.

Beam bridge.
Pedestrian beam bridge over an irrigation canal
Main span ≅ 4 m
Girder Cold formed steel (CFS) lipped channel

Cold Formed Steel Girder

Figure 2 shows the bridge.

Beam bridge.
Pedestrian beam bridge with cold formed steel lipped channel girders

The bridge configuration consists of two cross-braced piers that placed in the irrigation canal. The side span a ≅ 4 m, and the central span b ≅ 2 m. The piers' columns are made of square hollow sections, while the remaining steel members are made of lipped channels; they are connected by welding. The deck is made of bamboo pole slices (length of about 1 m) that are placed over non-continuous girders. Two lateral members (marked with L) are connected to the external girders and the side slopes in the upstream region. The external girders of the side spans are also connected to inclined members (marked with I) that are asymmetrically arranged, as shown in the schematic lateral view in figure 3.

Lateral view.
Lateral drawing of a pedestrian beam bridge with lipped channel girders.
  • What is the purpose of the lateral members L and the inclined members I?
    Would an alternative variant made of lipped channels without the piers and the lateral and inclined members be possible?
  • Abutments

    Abutments are not installed; the girders are placed directly onto the side slopes, as shown in figure 4.

    Abutment-less beam bridge.
    Abutment-less pedestrian beam bridge with CFS girders
  • What must be considered before placing the girders directly onto the side slopes?