Suspension Bridges

Structure

Suspension bridges are made up of a pylon, a side pylon, foundation of a pylon, suspender, suspension cable, side span, centre span and a stiffening girder.
Pylon: Vertical support that usually supports the cables of a suspension bridge.
Side Pylon: Tower-like vertical construction that is placed at the side and usually supports the cables of a suspension bridge.
Foundation of a Pylon: The lower part of a pylon and is very durable.
Suspender: the support cable.
Suspension Cable: The set of wire that supports a bridge.
Side Span: Segment between two pylons at the end of a bridge.

Centre Span: Segment between two pylons at the centre of a bridge.

Stiffening Girder: The tightener beam.

First Used

The first suspension bridge was built in 1816 and was a temporary foot bridge in Philadelphia. The Niagara Falls Suspension Bridge was the first railway suspension bridge. It stood from 1855 to 1897 and it had wooden trusses, but the trusses had to be replaced due to the moisture rotting and decaying the wood.


Famous Example

A famous example of a suspension bridge is The Golden Gate Bridge. It got named that because of the golden/orange colour it's painted and because it's the gate to Marin County, or if your coming to San Francisco, It's the gate to San Francisco. They wanted to build a bridge that connects San Fransisco and Marin County. The bridge starts at the tip of San Francisco Peninsula and goes into Marin County.


Materials

Suspension Bridges are usually made out of steel, ropes, chains or cables. The cables hanging down from two tall steel, wooden or cement pylons. Sometimes it has trusses and they can be either wooden or steel.


Limitations

To build suspension bridges it is very expensive. You need steel beams that are usually four kilometres for suspension bridges. You would also need experience and large machinery.
In some countries, they do not have that kind of money or experience such as Cambodia.