Diagonal Zero Zero


Diagonal ZeroZero is a skyscraper in Barcelona, Catalonia, Spain. The building is tall with 24 floors. It was designed by Emba Estudi Massip-Bosch arquitectes in Barcelona, founded and led by Enric Massip-Bosch.
Diagonal ZeroZero hosts the corporate headquarters in Catalonia of Telefónica Group, as well as its Research and Development Center. The building is built on land owned by the City of Barcelona, was developed by the public agency Consorci de la Zona Franca, and leased to Telefónica Group.
Diagonal Zero Zero is an example of high-tech architecture. Its structure, calculated by the engineering firm MC2-Julio Martínez Calzón, was erected in eight months, working in three shifts a day, seven days a week. For a few months there were over 450 workers operating simultaneously on-site. The total construction time, after an initial phase in which works were stopped for few months, amounted to two years until inauguration.
The structure of the building is a variation of the tube-in-tube scheme, in which the core is built in concrete, and the perimeter structure is built in steel. This perimeter structure is split in two rings: an interior vertical structure of very slender H pillars, placed every 135 cm; and an exterior bracing lattice supporting the torsion and flexing stresses of the tower produced by wind or earthquakes.