The Eiffel Tower is a huge media exposed truss iron Tower, was built for the universal exhibition of Paris of 1889. It was named after its constructor, the French structural engineer Alexandre Gustave EIFFEL, who helped design the engineers Maurice Koechlin and Emile Nouguier and architect Stephen input. Built to celebrate the science and engineering of the achievements of his age, 300 m structure includes two visibly distinct parts, a base composed of a platform resting on four separate media (called pylons or bents) and above this, a tower slender created as bents scroll upward, rising over a second platform to merge in a single column.
This work without precedent, the highest structure of the world until the Empire State Building was built about 40 years later, had several histories. Among them were the overpasses of iron-making in charge of railway designed by Eiffel and a design of a circular tower, iron framework proposed by American engineers Clarke and Reeves for the 1876 Centennial Exposition. Eiffel knew and acknowledged publicly this influence; He is no stranger to the United States, who designed (1885), the Tower of iron forged in the Statue of liberty of Frederic Bartholdi. Eiffel Tower was the European authority of leading on the aerodynamics of high frameworks. In the construction of the Eiffel Tower, the tower base curve was precisely calculated that the wind shear and bending, the forces were gradually transformed into compression forces, which could withstand more bents effectively. The super skyscrapers erected since the 1960s, such as the World Trade Center are constructed in the same way. Before starting work on the wrought iron Tower, Eiffel had earned a reputation as a famous Builder of bridges and viaducts. He designed an arch above the Douro River Bridge to the Portugal which had a length of 160 m (525 m). In 1884, Eiffel designed the Tower of iron for the Statue of liberty and the following year, began work on the cupola of the Nice Observatory. Later, he is interested in aerodynamics and wrote the Air resistance (1913).