Bridges

A bridge is a structure build to bridgework physical obstacles such as a body of water, valley or road, for the shoot for of providing passage over the obstacle. There atomic number 18 many different designs that all serve unique purpose and apply to different situations.
The first link were made by nature itself, when a log has fallen across a stream or stones in the river. Some early Americans apply trees or bamboo poles to cross small caverns or well to attain from one place to another.
Bridges can be categorised in several different ways. Some of them include send off bridge, arch bridges, truss bridges etc. Beam bridges have straight slabs or girders carrying the roadbed. Arch bridges be in compression and thrusts outward on its bearings at each end. One of the oldest arch bridge is the Arkadiko bridge in Greece. It was create in the 13th century. A truss bridge is a bridge whose load-bearing superstructure is composed of a truss. These type of bridges are one of the oldest types of modern bridges.




The greatest bridge builders were the superannuated Romans. They built arch bridges that could stand in conditions that would trauma or destroy earlier designs. An example is the Alcantara bridge which was built over the river Tagus, Spain.
The Golden Gate bridge is a fault bridge spanning the Golden Gate, the opening of the San Francisco Bay into the Pacific Ocean. It is 2737m bulky and 227m high. The construction of this bridge started in 1933 and ended in 1937.If you penury to get a full essay, order it on our website: Orderessay



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