General Information
Figure 1 shows a suspension bridge that is used by motorcycles, bicycles and pedestrians.
![Suspension bridge over a river](bridges/suspension-bridges/bridge-16/1-suspension-bridge.jpg)
Type | Single-span suspension bridge |
Main span | ≅ 250 m |
Deck width | ≅ 2 m |
Deck width to main span ratio | ≅ 1:125 |
Pylon | Reinforced concrete (H-shaped) |
Girder | Steel transverse beam |
Sag to Main Span Ratio
Figure 2 shows a side view of a main span sector.
![Main span sector](bridges/suspension-bridges/bridge-16/2-main-span.jpg)
The sag H ≅ 10 m, and the main span S ≅ 250 m; that gives a sag to main span ratio of 1/25.
Main Cables
Figure 3 shows a main cable in the main span region and a schematic cross-section of it.
Side view | Cross-section |
![Main cable and cross section of it](bridges/suspension-bridges/bridge-16/3-main-cable.jpg)
A main cable consists of ten steel wire ropes, which are bound together by U-bolt clamps and plastic strips. Figure 4 shows the main cables in the bridge entrance region.
![Main cables in the bridge entrance region](bridges/suspension-bridges/bridge-16/4-main-cables.jpg)
Hanger Cables
Figure 5 shows a side view of a main span sector.
![Main span sector](bridges/suspension-bridges/bridge-16/5-main-span.jpg)
Figure 6 shows a mid-span region sector.
![Main span mid-region sector](bridges/suspension-bridges/bridge-16/6-mid-region.jpg)
The roadway and the main cable are about at the same elevation. The hanger cables are wrapped around the main cable and fixed with U-bolt clamps. Figure 7 shows a hanger cable before the mid-span region and a hanger cable in the mid-span region.
Before the mid-span region | Mid-span region |
![Hanger cables before the mid-span region and in the mid-span region](bridges/suspension-bridges/bridge-16/7-hanger-cables.jpg)
What are the main problems?