The Eiffel Tower (French: La Tour Eiffel), stands on the Place de la Guerre in the city of Paris, France.

It is located next to the Seine River. For the 1889 World's Fair, to celebrate the 100th anniversary of the victory of the French Revolution. The French government invited tenders for the construction of the Eiffel Tower.

Its construction was started on January 26, 1887, and completed on March 31, 1889. It became the tallest building in the world at that time.

The initial height of the Eiffel Tower was 312 meters and is now 330 meters tall. The first floor is 57 meters high and covers an area of 4,415 square meters. The second floor is 115 meters high and covers an area of 1,430 square meters.

The third floor is 276 meters high and covers an area of 250 square meters. There are five elevators from the plaza to the second floor. There are two two-person elevators from the second floor to the top floor.

The tower has five areas: the square, the first floor, the second floor, the top floor, and the garden, and receives 7 million visitors a year.

In 1884, France made a decision. A World's Fair was planned for 1889 to celebrate the 100th anniversary of the victory of the French Revolution. In May 1886, the French government invited tenders for the exposition building for the whole world. A tower was designed in the Place de la Guerre in Paris.

There were two conditions: the tower could attract visitors to buy tickets to visit. It could be easily dismantled after the exposition. In November of the same year, the French Minister of Trade approved the Eiffel team's final proposal for the tower.

Eiffel signed separate contracts with the French government and the city of Paris to provide four-fifths of the total budget and to receive all revenues generated by the tower during the exposition and for twenty years thereafter.

The Eiffel Tower is a very light structure. If it is considered a solid structure, its equivalent density is only 7 to 8 times the density of the surrounding air. The Eiffel Tower is equipped with inclined elevators in the columns between the bottom of the tower and the second platform.

The stairs and elevators are integrated into the overall structure according to the lines of the main structure. There is no sense of rigid attachment. The tower has legs made of lattice girders.

They are supported on the foundation piers at an angular inclination from the first platform to the first platform lattice beam frame column inclination is slightly positive the first platform up the column is almost vertical. Finally, the columns are brought together at the top of the tower.

The columns are linked by equally spaced beams, which is the location of the platform. The hollow mesh-like steel frame greatly reduces the weight of the tower.

The entire structure of the Eiffel Tower is tall and imposing, narrow at the top and wide at the bottom, giving it an aesthetic sense of balance and stability. The entire tower, down to each component, is symmetrical in the three-dimensional coordinate system.

There are three kinds of basic analysis frame elements, and the many rods of the tower are arranged and combined in an orderly manner according to the composition rules. It makes many forms of unity.

At the same time, the order of using the three types of frame elements is also from the bottom to the top. It is gradually simplified and lighter, and the stiffness of the structural members is reasonably distributed.

At the lower crossbeam, the tower column has been spread very wide. As a result, the span of the crossbeam is increased accordingly, and its function as a link is relatively weakened while the spanning effect is reflected.

In order to further strengthen the connection between the tower columns and crossbeams and make them unified as a whole, and to fully reflect the spanning effect at the bottom of the tower due to the forked tower columns, a set of giant arches is designed and arranged.