General Information
Figure 1 shows a pedestrian cable-stayed bridge.
| Type | Single-span cable-stayed bridge |
| Main span | ≅ 12 m |
| Deck width | ≅ 0.8 m |
| Girder | Steel square hollow section |
| Pylon | Steel |
| Stay cable arrangement | Radial (two cable planes) |
Stay Cable Arrangement and Inclined Members
Figure 2 shows a schematic three-dimensional view of the bridge.
Pylon 1 is connected to two back and four front stays, while pylon 2 is connected to a pair of front and back stays, which are inclined in two planes and converge toward the longitudinal axis of the bridge (black dashed line). Pylon 1 and the girder are also connected by two inclined members with a rectangular hollow cross-section.
What is the purpose of the inclined members?
Stay Cables
A cable plane is marked in figure 3.
Each cable plane consists of five stay cables: 1, 3, and 5 are made of a steel wire rope, while 2 and 4 are made of a steel round bar.
Stay Cables Anchorages
The stay cables are anchored to the girder as shown in figure 4.
Stay cables 2 and 4 (round bars) are anchored to the girder by welding: stay cable 2 has a bent termination, while stay cable 4 has an unbent termination. Stay cable 3 (wire rope) is bent around the girder; the termination consists of a single U-bolt clamp. Stay cables 3 and 4 are overlapping each other.
What is the purpose of overlapping stay cables 3 and 4?
Stay Cables Vibrations
Figure 5 shows the bridge.
Video 1 shows front stay cables 4 and 4.1 during hand-induced vibration.
The vibration amplitude of stay cable 4 is smaller than the vibration amplitude of stay cable 4.1.
Bridge Cross-Section
Figure 6 shows a schematic cross-section of the main span.
The cross-section consists of three square hollow sections over which are placed C-channels with constant spacing, and the deck is made of bamboo lattice. The front stays are connected to the external sections 1 and 3, and the deck width is about 0.8 meters. Figure 7 shows the bridge viewed from below.
Main Span Deflection
Figure 8 shows a side view of the bridge.
The vertical deflection in the mid-span region d ≅ 0.3 m.
Construction Phase
Figure 9 shows a bridge sector.
The pylon is placed over the external sections 2 and 3.
Efficient Span Range
A steel twin girder bridge as an alternative variant and the used cable-stayed bridge are shown in figure 10.
What are some possible reasons for choosing the used bridge instead of a steel twin girder bridge?