Special Bridges with Double Layered Truss Girders

March 24, 2022
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1. Introduction

Depending on the purpose, a bridge can be planned in various shapes. To enable a large amount of transportation, a bridge designer can apply several design considerations to a bridge design. Let’s look at one of them.

A double-layer bridge provides more space through the double-layer girder to transport vehicles, trains, or pedestrians. This type of girder has enough vertical clearance to carry them. Therefore, it could make clearance issues under the bridge, and also it could make aero stability issues. Nevertheless, the double-layer girder can be one of the available options for a bridge in areas where heavy traffic is expected.

The following post would like to introduce some special bridges with cable supports and double-layer truss girders that can carry heavy pedestrian and vehicle traffic. The table below shows a list of some of these special bridges.

 

Built Date Bridge Name Bridge Type Main Span Length (m) Carriageway no. 
1931 George Washington Bridge Suspension Bridge 1,067.0 8 + 6 lanes
1959 Fort Pitt Bridge Bowstring Arch 228.6 4 + 4 lanes
1962 Sherman Minton Bridge Bowstring Arch 240.0 3 + 3 lanes
1964 Verrazzano-Narrows Bridge Suspension Bridge 1298.45 6 + 6 lanes
1985 Onaruto Bridge Suspension Bridge 876.0 4 + 2 lanes
1993 Rainbow Bridge Suspension Bridge 570.0 4 + 4 lanes
2002  Gwangan Bridge Suspension Bridge 500.0 4 + 4 lanes
2011 Gogeum Bridge Cable-Stayed Bridge 480.0 2 +1 lanes
 
Table. List of Special Bridges with Double-Layered Truss Girders

 


2. Bridge Details

 

2.1 George Washington Bridge

 

The George Washington Bridge is a suspension bridge built in 1931 in the USA. The total length of the bridge is 1,450m, and the main span is 1,067m. Pylons and girders in the bridge consist of truss structures. The girder has two levels, and it carries vehicle traffic only. The total lanes are 14 lanes. The upper level has eight lanes, and the lower level has six lanes. Each level has been planned as two-way traffic.

 

1.George Wahsington BridgeFigure 1. George Washington Bridge

 

2.2 Fort Pitt Bridge

 

The Fort Pitt Bridge is a bowstring arch bridge built in 1959 in the USA. The total length of the bridge is 368m, and the main span is 230m approximately. Each level has four lanes, and it has been planned as one-way traffic.

 

2.Fort Pitt Bridge Figure 2. Fort Pitt Bridge

 

2.3 Sherman Minton Bridge

 

The Sherman Minton Bridge is a twin bowstring arch bridge built in 1962 in the USA. The total length of the bridge is 625.7m, and the main span is 240m approximately. Each level has three lanes, and it also has been planned as one-way traffic.

 

3.Sherman Minton Bridge Figure 3. Sherman Minton Bridge

 

2.4 Verrazzano Narrows Bridge

 

The Verrazzano Narrows Bridge is a suspension bridge built in 1964 in the USA. The bridge's total length is 4,176m, and the main span is 1,298m long approximately. This bridge has a great span length among bridges that have multi-layer girders. Each level has six lanes, and it also has been planned as two-way traffic.

 

4.Verrazzano Narrows Bridge Figure 4. Verrazzano Narrows Bridge

 

2.5 Onaruto Bridge

 

The Onaruto Bridge is a suspension bridge built in 1985 in Japan. The total length of the bridge is 1,629m, and the main span is 876m. The upper level has four lanes, and it has been planned as two-way traffic. The lower level has two lanes. It has been planned for train traffic initially. However, both levels are used for pedestrians at the moment.

 

5.Onaruto Bridge Figure 5. Onaruto Bridge

 

2.6 Rainbow Bridge

 

The Rainbow Bridge is a suspension bridge built in 1993 in Japan. The total length of the bridge is 798m, and the main span is 570m. Each level has four lanes, and it has planned as two-way traffic. The upper level allows vehicles only. So, pedestrians can pass through the lower level.

 

6.Rainbow Bridge Figure 6. Rainbow Bridge

 

2.7 Gwangan Bridge

 

The Gwangan Bridge is a suspension bridge built in 2002 in Korea. The total length of the bridge is 900m, and the main span is 500m. Each level has four lanes, and it has planned as one-way traffic.

 

7.Gwangan Bridge Figure 7. Gwangan Bridge

 

2.8 Gogeum Bridge

 

 

The Gogeum Bridge is a cable-stayed bridge built in 2011 in Korea. The total length of the bridge is 1,116m, and the main span is 480m. Each level of girder in the bridge has a different purpose. The upper level has two lanes, and it has planned as two-way traffic. The lower level has one lane, and it is used for pedestrian traffic.

 

8.Gogeum Bridge Figure 8. Gogeum Bridge

 

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About the Author
TaeYong Yu | Technical Engineer | MIDASIT

Taeyong is a bridge engineer within MIDASIT Technical Planning Team in South Korea. He has over 3 years of experience in the design of bridges and civil structures in Korea. He is familiar with international codes of practice including AASHTO, Eurocode and BS code. He has experience in discussing technical issues with engineers in Singapore, Malaysia, and Romania.

 

 

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