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Tower bridge of London

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Tower Bridge, is a type os suspension structure and is supported to traction. Is a bridge that crosses the River Thames in London. It combines the characteristics of swinging bridge and suspension bridge. It is built in neo-Gothic Victorian style , and is located near the Tower of London, which gives it its name. During the second part of the 19th century, economic development in East London led to the need for a new passage over the river, below the London Bridge . The traditional fixed bridge could not be built because it would cut off access to the port that at that time was located in the Pool of London , between the London Bridge and the Tower of London . A tunnel under the Thames , Tower Subway , was opened in 1870, but only served for pedestrian traffic. In 1875 a special committee was created to find a solution to the passage over the river, which called for a contest to choose the design of the future bridge. More than fifty designs were proposed, including one by
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Twins towers

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It is a type of frame structure because they have the combination of beams, columns and slabs to resist the lateral and gravity loads. They were braced structures because they usually provided between beams and columns to increase their resistance against the lateral forces and side ways forces due to applied load. Bracing is usually done by placing the diagonal members between the beams and columns. This frame system provides more efficient resistance against the earthquake and wind forces. Story of the twins  towers,            → On September 11 of 2001, two planes hijacked by terrorists crash into the Twin Towers, destroying the complex. One World Trade Center is struck at 8:46 a.m.; Two World Trade Center at 9:03 a.m.  To read the timeline of events of that day including two other associated terrorist hijackings https://www.youtube.com/watch?v=FvL9xm-_s2k
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Eiffel tower

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-The Eiffel tower is a type of truss structure because it is used in the structure of buildings in order to make them more stable than structural components with 90 degree angles could. Story of the Eiffel tower: - Constructed from 1887–89 as the entrance to the 1889 World's Fair , it was initially criticized by some of France's leading artists and intellectuals for its design, but it has become a global cultural icon of France and one of the most recognisable structures in the world. [3] The Eiffel Tower is the most-visited paid monument in the world; 6.91 million people ascended it in 2015. The tower is 324 metres (1,063 ft) tall, about the same height as an 81-storey building, and the tallest structure in Paris . Its base is square, measuring 125 metres (410 ft) on each side. During its construction, the Eiffel Tower surpassed the Washington Monument to become the tallest man-made structure in the world, a title it held for 41 years until the Chrysler Building
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Medieval castle.

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A castle is a type of frame structure built in Europe and the Middle East during the Middle ages by European nobility , it has the combination of beams , columns and slabs to resist the lateral and gravity loads. In the beginning castles, were constructed out of wood,stone and mortar.The earlier the castle, the more wood was employed . The castles were both offensive and defensive structures; they provided a base from which raids could be launched as well as protection from enemies. Parts of a medieval castle: https://www.youtube.com/watch?v=BOD28tjlSm8
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