These trusses are made up of wrought iron. The large grid of trusses that span between the legs acts as a beam for the structure. These decks are supported by the large grid of trusses that span between the legs. The floor of all the observation deck is made up of wrought iron. These structural members are discussed below: 2.1 Floor System The structural members of the Eiffel Tower consist of the floor system, beams, and legs. Geological map of Eiffel Tower site (Eiffel Tower is depicted by the black square) 2. The average shear velocity is around 250 m/s in alluvial layers of the tower site. Some of the present researches conclude that a clear resonance frequency of 2 Hz was observed at the tower site.Such soil conditions were not suitable for the foundation construction of such a tall tower. The area around the bed of Eiffel Tower is characterized by an outcropping of conglomerates, silts and sands.The chalk rock bed is approximately 30 m from the ground layer.The lower bed of subsoil consists of plastic clay and is around 16 m deep, resting on the chalk rock.The soft soil is predominantly located underneath the riverside legs, requiring deeper and broader foundations than the park side legs to reduce the settlement of the tower.
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