Bridges-R-Us

1. Bridges-R-Us Kelcie Thomas Ashley Bouffard Brad Smith

2. Timeline • The first bridges were made by nature. One example of a prehistoric bridge is the Bering Strait land bridge that the nomads used to cross from asia into North America.

3. Timeline • Humans have always used bridges as an advantage, but the Romans were among the first to make them. Bridge production in the Roman era started in the 1st and 2nd Century AD.

4. Timeline • Bridges in Europ appeared in the 2nd century AD and among these are the Alconétar Bridge, one of the few reamining segmental arch bridges.

5. Timeline • Stronger Bridges started appearing in India in the 4th century AD and these new bridges used stronge structural support such as bamboo planks and iron chains.

6. Timeline • Stone bridges appeared in China in the 6th and 7th century AD and today the oldest surviving stone bridge is the Zhaozhou Bridge, built during the Sui Dynasty.

7. Timeline • The invention of the Inhabited bridges was in 12th through 16th century AD and these were the first to obtain houses.

8. Timeline • Just prior to European colonization of the South American Andes in the 1500’s, the Inca were thought to use rope suspended bridges.

9. Timeline • The first iron bridge appeared in England in 1779. It was a groundbreaking design thatr used cast irpn instead of the traditional wooden planks or stone.

10. Timeline • Girder bridges first appeared in the early 20th century and they are used to usually carry heavy weights.

11. Timeline • Truss bridges first showed up in the U.S. when a simple form of it was patented in 1820. However, they did not become popular unilt the years between the 1870’s and 1930’s.

12. Suspension • Suspended by cables • Early suspension bridges were made of rope and other materials • Allows for the longest span • Etc.

13. Truss • Skeletal structure • Made to form tension or compression, not bend • Made for shorter distances • Etc.

14. Cantilever • Modified form of arch bridge • Unsupported at one end but supported at the other, like diving boards • Central truss bridge • Etc.

15. Arch • Forms a curved arch • Provides high resistance to bending forces • Allows no rotation at the foundation • Etc.

16. Girder • Can be as simple as a log across a opening • Most common girders used are I-beam and box beam • Built on top of girders to carry traffic • Etc.

17. Golden Gate Bridge It is a suspension bridge and was completed in 1937. It is six lanes wide and it connects the San Francisco Peninsula to Marin County. It is one of the most popular places for suicides, with a count of an excess of 1200 suicides and averaging at least one suicide every two weeks.

18. The Brooklyn Bridge The Brooklyn bridge is one of the oldest suspension bridge in the United States, it was completed on May 24, 1883.

19. Forth Rail Bridge The Forth Rail Bridge is located in Scotland. Its the first major steel bridge, with its gigantic girder spans of 521 m. ranks as one of the great feats of civilization. It was begun in 1883 and formally completed on 4 March 1890.

20. Sydney Harbour Bridge The Sydney Harbour Bridge is a steel arch bridge across Sydney Harbour that carries rail, vehicular and pedestrian traffic between the Sydney central business district (CBD) and the North Shore. The dramatic view of the bridge, the harbour, and the nearby Sydney Opera House is an iconic image of both Sydney and Australia. The bridge is locally nicknamed "The Coathanger"or "Colin“because of its arch-based design.

21. The Rialto Bridge The Rialto Bridge (Italian: Ponte di Rialto) is one of the four bridges spanning the Grand Canal in Venice, Italy. It is the oldest bridge across the canal and probably the most famous in the city.