Now day civil engineers are not only involved in he measuring, or resistance, but also they care about the aesthetic. There are different types of bridges that marked not only the history but the progress in society. The bridges vary depending on the material with which it is built and the shape they have.

Types of bridges: Wood: These bridges are quick to build, and are not too expensive, yet are very resistant and durable, plus they need constant and expensive maintenance. For the ease of being built and cheap were the first bridges that people used.

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Stone: They are very resistant, compact and durable. Currently instruction is very expensive. They do not need much maintenance, since they are very well resistant weathering agents. Metallic: They are built quickly, are expensive and have corrosion as an against factor. Also, their maintenance is expensive.

Concrete and steel: They allow varied designs, often support precept, they are resistant, and maintenance costs are low. The functions that bridges have are:

Aqueduct: They are used for water conveyance. Viaducts: They are built to have automobile transit. Footbridges: Built for the use of pedestrians only.

The way bridges resist their efforts: Beam: They consist of horizontal elements that are supported at their ends on supports or pillars. The force transmitted through the pillar is vertically downwards and, therefore, they are subjected to compression, the beams (horizontal elements) tend to bend as a result of the loads on.

Arc: It has 2 divisions. Top board, and Lower board. They consist of a curved section which rests up on supports or brackets and covering a light or empty space and depending on whether they are above or below the board, is where the arcs are located.

Hanging: They consist of a board by hanging by a large number f straps, two large cables that are anchored at the ends of the bridge and held by large towers of concrete or steel.

Conclusion: The bridges have set-Veda as communication routes, and have had a lot of impact on society and commerce. Bridges are very important in the area Of civil engineering, because their work as engineers is to build and make sure that their work is good to use, and efficient. In addition, the bridges have made the civil engineer to worry about the design of buildings and to show them that is important the aesthetic and how innovative is the work.