What Is Cantilever Bridge?
Cantilever bridges are widely seen in major cities and movies. Though you have seen them but might not know the name it is called, yes, they are the long cantilever bridges that can carry heavy loads.
These types of bridges are built with cantilevers; hence they are named Cantilever bridges. Before getting into details, let us know what a cantilever is?A cantilever is a structure with one of its ends fixed and free at other ends. The other end projects horizontally into space, and it is this end that helps support the bridge. A cantilever bridge works in such a way that the bottom part of each cantilever is fixed or anchored into the ground, while the upper end of the cantilever supports the bridge itself.
Types Of Cantilever BridgeThe cantilever bridges are mainly divided into two types:
- Balanced Cantilever Bridges
- Continuous Cantilever Bridges
1. Balanced Cantilever BridgesThe balanced cantilever bridge does not require any falsework. Usually, this type of bridge is opted for constructing a long-span bridge. If the bridge construction requirement is not suitable for simply supported or continuous frame type structures, then balanced cantilever bridges can be used. We know that constructing a long-span continuous or simply supported bridge requires a solid foundation, which would be more expensive to construct.
2. Continuous Cantilever BridgesThe continuous cantilever bridge is a truss bridge that extends across three or more supports without hinges or joints. Cantilever bridges are highly simplified, but they will explain the basic concepts of a conventional beam. The abutments should be made heavy to compensate for the absence of a balanced cantilever. These types of Cantilever bridges work as continuous beam feet span between two support by maintaining their bending moment and Shear Strength throughout the beam.
Advantages Cantilever Bridges1. Generally, the requirement of falsework is not much, other than the requirement for the pier.
Disadvantages Of Cantilever Bridges1. A cantilever bridge requires a heavier structure to take care of its own stability by creating stability between compressive and tensile forces. 2. During the construction of Cantilever bridges, they experience a high level of tension which is known as negative moments. 3. Cantilever bridges cannot be constructed in extreme climate conditions due to the lack of multiple seasons. 4. Cantilever bridges require advanced analysis to prevent future fatigue failure of elements and welds. 4. Disability of the RC floor as part of a composite section. 5. It is challenging to construct and maintain these bridges, as they are largescale structures. 6. Requires bigger and stronger support columns to withstand the bridge load. 7. Generally, Long span bridges have truss bridges between the two cantilevers to reduce their weight. 7. Cantilever beams are not suitable for earthquake-prone areas or areas with low-rock stability.
Top 10 Longest Cantilever Bridges in the world
1. Pont de Québec Bridge, Canada: It is the world’s longest cantilever road bridge with 549m in length.
2. Minato Bridge, Japan – This is the second-longest cantilever bridge with a span of 510m in length.
3. Commodore Barry Bridge, United States – This bridge is the world’s third-longest cantilever bridge with a span of 501.09m in length.
4. Crescent City Connection, United States – This bridge is the world’s fourth-longest cantilever bridge with a span of 480m in length.
5. Howrah Bridge, India – This bridge is the world’s fifth-longest cantilever bridge, with a span of 457.20m in length.
6. Gramercy Veterans Memorial Bridge, United States – This bridge is the world’s sixth-longest cantilever bridge with a span of 445.01m in length.
7. Horace Wilkinson Bridge, United States – This bridge is the world’s seventh-longest cantilever bridge which has a span of 376.43m in length.
8. Tappan Zee Bridge, United States – This bridge is the world’s eighth-longest cantilever bridge with a span of 369m in length.
9. Lewis and Clark Longview Bridge, United States – This bridge is the world’s ninth-longest cantilever bridge with a span of 365.76m in length.
10. Ed Koch Queensboro Bridge, United States – This bridge is the world’s tenth-longest cantilever bridge with a span of 360m in length.Also Read
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