Suspension bridges 1ra

SUSPENSION BRIDGES

Cristina Rivero, Ahinoa Bosch, Marta Jusmet and Manu Alvarez

INDEX  Suspensions bridges  Pros and cons of suspensions

bridges  Compression and tension forces  Golden Gate Bridge

What are suspension bridges?

• Suspension bridges are strong and

can span long distances.

• One early bridge was designed and build in 1801 in Pennsylvania.

• They are expensive bacause they take a long time to build and requir a large amount of material.

What are suspension bridges? • The

primary elements of a suspension bridge are a pair of main cables stretching over two towers and attached at each and to an anchor. • Smaller cables attached to the main cables support the roadway.

Pros of Suspension Bridges • Spans disnaces up to 7000 feet.

• They are considered very attractive.

• They

allow large ships and heavy boat traffic to pass underneth.

Cons of Suspencion Bridges

• They

are very expensive because it requires a long time and a large of material to build.

Compression forces Traffic pushes down on the roadway, but because it is suspended from the cables, the weight is carried by the cables, which transfer the force of compression to the two towers.

Tension forces The force of tension is constantly acting on the cables, which are stretched because the roadway is suspended from them.

Compression and tension forces

Golden gate bridge •

It is located in San Francisco, United States.

• Its total length is 2,7 kilometers.

• It was opened to the public in 1937.