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 * BRIDGES **

In this document we will talk about bridges, types of bridges, materials, designs, uses, advantages, disadvantages, and some examples of bridges. A bridge is a structure built to span physical obstacles such as a body of water, valley, or road, for the purpose of providing passage over the obstacle, to cut down the effort and time needed to do so. Until the end of the 18th Century, bridges were made out of timber, stone and masonry. Modern bridges are currently made of concrete, steel, fiber reinforced polymers, stainless steel or combinations of those materials. Designs of bridges vary depending on the function of the bridge, the nature of the terrain where the bridge will be constructed, the material used to make it and the funds available to build it. Bridges can be categorized in several different ways. Common categories include the type of structural elements used, by what they carry, whether they are fixed or movable, and by the materials used. Bridges may be classified by how the forces of tension, compression, bending, torsion and shear are distributed through their structure.

Among the examples of globally significant bridges are: The Arkadiko Bridge in Greece, Pulteney Bridge; Roman bridge of Córdoba; Ponte Vecchio; Lomonosov Bridge in St. Petersburg; Stone arch bridge in Shaharah; Old Bridge in Mostar, Bosnia and Herzegovina; Mehmed Paša Sokolović Bridge in Višegrad, Bosnia and Herzegovina.

In conclusion some of the benefits of bridges are obvious: supplies of food and traded goods can get across an obstacle or through difficult terrain in a shorter time. Today bridges allow easy travel across major rivers and estuaries, over the new obstacles of motorways and railway lines, and between neighbouring islands. International trade and travel depend on shipping and air routes, but efficient distribution networks depend on bridges. media type="custom" key="21220680"media type="custom" key="21220692"media type="custom" key="21220700"media type="custom" key="21220710"media type="custom" key="21220716"