General Information
Figure 1 shows a pedestrian suspension bridge.
![Pedestrian suspension bridge in a park](bridges/suspension-bridges/bridge-23/1-suspension-bridge.jpg)
Type | Three-span suspension bridge |
Main span | ≅ 70 m |
Deck width | ≅ 2 m |
Deck width to main span ratio | ≅ 1:35 |
Pylon | Reinforced concrete (A-longitudinal shaped) |
Girder | Steel truss |
Side Spans
Figure 2 shows a side span.
![Side span of a pedestrian suspension bridge](bridges/suspension-bridges/bridge-23/2-side-span.jpg)
The side span s ≅ 10 m. Figure 3 shows the truss girder.
![Side span truss girder of a pedestrian suspension bridge](bridges/suspension-bridges/bridge-23/3-truss-girder.jpg)
The truss girder is made of L-profiles. The height h and the distance between the hanger cables d ≅ 0.9 m. Figure 4 shows the side span girder without hanger cables (single-span suspension bridge with two approach spans).
![Approach span variant of a pedestrian suspension bridge](bridges/suspension-bridges/bridge-23/4-approach-span.jpg)
How do the side spans affect the structural behavior of the bridge?
Vibrations of the Side Span Hanger Cables
Figure 5 shows the bridge viewed from a side span.
![Side span of a pedestrian suspension bridge](bridges/suspension-bridges/bridge-23/5-side-span.jpg)
Video 1 shows hanger cables 1 and 2 during hand-induced vibration.