Suspension Bridge

Definition

A suspension bridge is a type of bridge that is supported by cables or chains that are anchored at each end and suspend the deck of the bridge from above. This design allows for the construction of long-span bridges that can cross wide rivers, deep valleys, or other large obstacles.

5 Must Know Facts For Your Next Test

1. The shape of the suspension cables in a suspension bridge follows a catenary curve, which is the shape formed by a flexible chain or cable hanging freely under the force of gravity.
2. Suspension bridges are known for their ability to span long distances, with some of the world's longest suspension bridges exceeding 1 mile in length.
3. The deck of a suspension bridge is typically supported by a network of trusses, which distribute the weight of the deck and traffic across the suspension cables.
4. The anchorages at each end of a suspension bridge are critical structural elements, as they must be able to withstand the immense tension forces exerted by the suspension cables.
5. Suspension bridges are often used to cross wide rivers, deep valleys, or other large obstacles where traditional bridge designs would be impractical or impossible to construct.

Review Questions

• Explain how the catenary curve of the suspension cables in a suspension bridge relates to the parabolic shape of the deck.
  • The catenary curve formed by the suspension cables of a suspension bridge is closely related to the parabolic shape of the deck. The cables, which are anchored at each end, hang under the force of gravity, creating a catenary curve. This curve is mathematically similar to a parabola, and the deck of the bridge is designed to follow this parabolic shape, allowing for efficient load distribution and structural integrity. The relationship between the catenary curve of the cables and the parabolic shape of the deck is a key design consideration in the construction of suspension bridges.
• Describe the role of the truss system in supporting the deck of a suspension bridge and how it relates to the parabolic shape of the bridge.
  • The truss system in a suspension bridge plays a critical role in supporting the deck and distributing the weight of the bridge and its traffic. The trusses, which are a framework of interconnected members arranged in a triangular or other stable configuration, are designed to follow the parabolic shape of the deck. This parabolic shape is directly influenced by the catenary curve of the suspension cables, as the deck is suspended from the cables. The truss system helps to transfer the loads from the deck to the suspension cables, allowing the bridge to span long distances. The relationship between the parabolic shape of the deck, the catenary curve of the cables, and the supporting truss system is a key structural feature of suspension bridges.
• Analyze how the design and construction of the anchorages in a suspension bridge contribute to the overall stability and load-bearing capacity of the structure, particularly in the context of the parabolic shape of the bridge.
  • The anchorages at each end of a suspension bridge are critical structural elements that contribute significantly to the overall stability and load-bearing capacity of the structure. The anchorages must be able to withstand the immense tension forces exerted by the suspension cables, which follow a catenary curve that is mathematically similar to a parabola. The parabolic shape of the bridge, influenced by the catenary curve of the cables, places unique stresses on the anchorages, as they must be designed to resist both vertical and horizontal forces. The strength and stability of the anchorages are essential in maintaining the structural integrity of the suspension bridge, allowing it to span long distances and support heavy loads. The relationship between the parabolic shape of the bridge, the catenary curve of the cables, and the design of the anchorages is a crucial aspect of suspension bridge engineering and construction.

Related terms

Catenary Curve: The shape formed by the suspension cables of a suspension bridge, which resembles an inverted parabola.

Truss: A framework of interconnected members (usually bars or rods) arranged in a triangular or other stable configuration, used to support the deck of a suspension bridge.

Anchorage: The strong, secure points at each end of a suspension bridge where the suspension cables are attached and anchored to the ground or a structure.