Beam bridge facts for kids
A beam bridge is a simple type of bridge. It is a flat, strong structure that stretches across a space. This structure rests on two supports, one at each end. It works like a strong plank, letting things cross over.
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What is a Beam Bridge?
Beam bridges are one of the oldest and most basic types of bridges. They are made from a straight, stiff piece, called a beam. This beam sits on supports at both ends. Imagine a wooden plank laid across a small stream. That's a simple beam bridge!
How Beam Bridges Work
When cars, trains, or people go over a beam bridge, their weight pushes down on the beam. This downward push is called a load. The beam itself resists this push. The supports at each end of the bridge push back up. This keeps the beam from bending too much or breaking. The shorter the beam, the stronger it is for its size.
Materials Used in Beam Bridges
Long ago, beam bridges were often made from wood. These were sometimes called log bridges. Today, most beam bridges are built using strong materials like steel or concrete. These materials make the bridges much stronger and more durable. They can carry heavier loads and last a very long time.
Where Are Beam Bridges Found?
Beam bridges are very common. You can see them almost everywhere! They are often built over:
- Highways, allowing cars to cross over other roads.
- Rivers or small streams.
- Gaps in the ground, like valleys or ditches.
They are great for short distances. They help people and vehicles cross safely and easily.
Connecting Beam Bridges
While a single beam bridge cannot be super long, many beam bridges can be connected. By joining several shorter beam sections, engineers can create a much longer bridge. Each section has its own supports. This design is useful for crossing wider areas.
Images for kids
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A footbridge using beams over a stream in Dordogne, France.
See also
In Spanish: Puente viga para niños
