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Bridges

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A description about bridges.

A description about bridges.

Published in: Design, Technology

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  • 1. A bridge is a structure built to span physical obstacles such as rivers, valley, or road, for the purpose of providing passage over the obstacle.
  • 2. HISTORY The first bridges were made by nature itself . The first bridges made by humans were probably spans of cut wooden logs or planks and eventually stones, using a simple support and crossbeam arrangement.
  • 3. PARTS OF THE BRIDGES
  • 4. TYPES OF BRIDGES 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.
  • 5. Beam Bridges Are horizontal beams supported at each end by substructure units and can be either simply supported when the beams only connect across a single span, or continuous when the beams are connected across two or more spans. When there are multiple spans, the intermediate supports are known aspiers.
  • 6. Truss Bridge Is a bridge whose load-bearing superstructure is composed of a truss. This truss is a structure of connected elements forming triangular units.
  • 7. Cantilever bridges Are built using cantilevers—horizontal beams supported on only one end. Most cantilever bridges use a pair of continuous spans that extend from opposite sides of the supporting piers to meet at the center of the obstacle the bridge crosses.
  • 8. Suspension Bridges Are suspended from cables. The earliest suspension bridges were made of ropes or vines covered with pieces of bamboo. In modern bridges, the cables hang from towers that are attached to caissons or cofferdams.
  • 9. Famous Bridges The Great Belt Bridge Is actually two bridges – an Eastern and a Western section, split by the small island of FionaThe East Bridge, a 1,624 meter (5,328 feet) long suspension bridge crosses the deepest part of Storebælt between the island of Zealand and Fiona
  • 10. Brooklyn Bridge Was completed in 1883, connects Manhattan and Brooklyn by spanning the East River. At the time it opened, and for several years, it was the longest suspension bridge in the world and it has become a famous and iconic landmark of New York.
  • 11. Nanpu bridge Is the world’s fourth longest cable stayed bridge. This is also the first girder bridge of Shanghai with a structural composition of steel and concrete. Before the year 1991, people used to communicate between Puxi and Pudong with the help of the ferry service. After the construction of the bridge completed in the year 1991, it connected Puxi to Pudong.
  • 12. Sydney Harbour Bridge Is one of Australia’s most well known and photographed landmarks. It is the world’s largest (but not the longest) steel arch bridge with the top of the bridge standing 134 meters (440 feet) above Sydney Harbour.
  • 13. Akashi-Kaikyo Bridge Also known as the Pearl Bridge, is the longest suspension bridge at 1,991 meters in the world. It spans the Akashi Strait in Japan connecting Kobe on the mainland and Iwaya on Awayi Island.
  • 14. The Millau Bridget Is an enormous cable-stayed road-bridge that spans the valley of the river Tarn near Millau in southern France. It is the tallest vehicular bridge in the world, with the highest pylon’s summit at 343 meters (1,125 ft) — slightly taller than the Eiffel Tower.
  • 15. The Golden Gate Bridge Is a suspension bridge spanning the Golden Gate, the strait between San Francisco and Marin County to the north. The masterwork of architect Joseph B. Strauss, whose statue graces the southern observation deck, the bridge took seven years to build, and was completed in 1937.
  • 16. Tower Bridge Is a combined bascule and suspension bridge in London, over the River Thames. It is close to the Tower of London, which gives it its name and has become an iconic symbol of London. Construction started in 1886 and took eight years to build. The bridge consists of two towers which are tied together at the upper level by means of two horizontal walkways which are designed to withstand the forces of the suspended sections of the bridge.
  • 17. Thanks for your attention! Somebody said: A smile is the bridge that put together two souls. Milgia Garay