Introduction of Cantilever Bridge

What Does Cantilever Means?

What Is Cantilever Support?

Cantilever Bridge

Type of Cantilever Bridges

• Balance Cantilever Bridges
• Continuous Cantilever Bridges

1. Balanced Cantilever Bridges

2. Continuous Cantilever Bridges

Advantages of Cantilever Bridges

1. In the construction of the Cantilever bridges, the falsework is not required.
2. Cantilever bridges can higher withstand the effects of Thermal Expansion.
3. Cantilever bridges are suitable for the longest span.
4. Cantilever bridges have multiple cantilever spans and can be immediately started from all the columns.
5. Due to lack of supporting piers in the Cantilever Bridges, it gives extra flexibility to the style and geometry of the highway supported by this Bridge.
6. The cantilever bridges are suitable for deep Rocky valleys and flood-prone areas where falsework is not possible.
7. In the construction of cantilever bridges, support is required on only one side of its cantilever.

Disadvantages of Cantilever Bridges

1. Cantilever Bridges experience a high amount of tension during the construction, which is known as a Negative moment.
2. Cantilever bridges have to take care of its stability by balancing between compressive as well as tensile forces acting on it.
3. Cantilever bridges are heavy, so it required larger and stronger support.
4. Cantilever bridges are not suitable for Earthquake-prone areas.
5. Construction of cantilever bridges is not suitable for excessive climate conditions.
6. Construction and the Maintenance of the Cantilever bridges are complex.

Cantilever Bridge Facts

1. The first cantilever bridge in the world was 38 metres long, which is also known as modern cantilever This Bridge was constructed by the engineer Heinrich Gerber in the year 1867.
2. The most famous cantilever bridge in the world is the Forth Bridge. This Bridge held the world record of the longest pen in all over the world for the 29 years.
3. Quebec Bridge is the longest span cantilever Bridge in all over the world which is 549 by length. It is the longest cantilever structure.

Cantilever Bridge

Cantilever Bridge Advantages

Disadvantages of Cantilever Bridge

Cantilever Bridge Pros and Cons

Pros of Cantilever Bridges

• The floor of the bridge is simply formed into sections to preserve uniformity and ensure high quality.
• It is less time-consuming, As multiple cantilever spans construction can be started simultaneously from all its columns.
• Navigation or passage under the bridge is not disturbed during the constructionprocess.

Cons of Cantilever Bridges

• A cantilever bridge requires a heavier structure to take care of its own stability by creating stability between compressive and tensile forces.
• During the construction of Cantilever bridges, they experience a high level of tension which is known as negative moments.
• Cantilever bridges cannot be constructed in extreme climate conditions due to the lack of multiple seasons.
• Cantilever bridges require advanced analysis to prevent future fatigue failure of elements and welds.

Advantages of a Cantilever Bridge

• They are less invasive. Because they only require impacting one other tooth, less natural tooth surface is disturbed.
• They look natural.
• A cheaper alternative.
• Their longevity makes them attractive.
• The healthier alternative.
• They are easy to place.

Cantilever Bridge Facts

Cantilever Bridge Features

Advantage and Disadvantage of a Cantilever Bridge

What Are the Advantages of a Cantilever Bridge?

• Structural Stability
• Flexibility in Span Length
• Resistance to Tension
• Durability
• Cost-effectiveness

Cantilever Bridge Cons

Cantilever Bridge Characteristics

1. Support: Cantilever bridges rely on a support system that consists of a pier or a solid foundation at one end, known as the "fixed support." This support provides the necessary stability for the bridge structure. The other end of the bridge extends without any intermediate supports, creating a cantilevered section.
2. Structural Elements: Cantilever bridges typically consist of three main structural elements: the cantilever arms, the suspended span, and the anchor arms. The cantilever arms are the sections that extend from the fixed support towards the center of the bridge. The suspended span is the section that connects the two cantilever arms, and it is often supported by additional stays or cables. The anchor arms extend from the center of the bridge to the opposite side, providing additional support and balance.
3. Tension and Compression: Cantilever bridges rely on a combination of tension and compression forces to distribute the weight of the bridge and provide structural stability. The cantilever arms are subjected to compression forces, while the suspended span experiences tension forces. This balance between tension and compression allows the bridge to support its own weight and any additional loads.

What Are Cantilever Bridges Used For?

How Does a Cantilever Bridge Work?

Types of Cantilever Bridge

• Balanced Cantilever Bridges. The balanced cantilever bridge does not require any falsework.
• Continuous Cantilever Bridges. The continuous cantilever bridge is a truss bridge that extends across three or more supports without hinges or joints.

Are Cantilever Bridges Strong?

What Is the Purpose of a Cantilever Bridge?

What Is One Advantage and One Disadvantage of a Cantilever Bridge Design?

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