Bridge connecting buildings A and C set of the headquarters of the TRF1 Brasília DF

It is the pedestrian bridge connecting two buildings of the Federal Regional Court in Brasília, DF, Brazil, designed by one of the greatest architects of the twentieth century Oscar Niemeyer, who had structural concrete as the raw material of his works. The walkway is tubular in shape, developing in a curved axis with a length of 48m, with a tubular cross-section, starting with a rectangular section of 3.0mx3.0m and ending with 9.8mx5.4m. The curved walls are prestressed CP190 prestressed cables, adherent. The bridge was built inside the set of 4 public buildings of curved geometry, isolated between the square on 3 levels of garages with 26,000m², in each basement. The connecting walkway between Buildings A and C gives public access to the amphitheater of Block C. The walls of the walkway have a thickness of 30cm and a variable height from 3.0m to 5.8m, built with self-compacting concrete, exposed. To mitigate the cracking inherent to the endogenous stresses of structural concrete construction, the work was carried out in 5 successive stages, starting with the inclined lower slab with 1.5%; followed by the walls in two stages and finished with the upper slab in the horizontal plane. The walls were prestressed, ensuring the redistribution of the reinforcements along the structure, which is supported at the end of building A and on the side of Building C, on elastomeric devices. The buildings are all built in exposed concrete with 165,000m2 of built area, on a plot of 57,600.00m2. The set of buildings is being built in accordance with the new concepts of sustainability and circularity. The work includes the procedures for structural design of the walkway and the structural considerations of buildings B and C, which have a curved axis plan. Construction took place from May 2024 to December 2024, in Brasília DF, Brazil.