Bridges types

An arch bridge is a very strong curved structure made of stone, concrete or steel. It is firmly supported on both sides. A bascule bridge has a central section that opens to allow tall ships to pass. London’s Tower Bridge is one of the most famous bascule bridges. A beam bridge is supported by the shore at both ends. This is the simplest and oldest type of bridge – a log across a stream is a very simple beam bridge. It is not very strong and may need to be strengthened by supports underneath. Cantilever bridge has two long arms held in place at the ends by anchors. Some can swing to let large ships through. Cantilever bridges are closest in length to suspension bridges. Suspension bridge is supported by steel cables fixed to high towers on the banks. All the world’s longest bridges are suspension bridges they are very strong.