The new fixed roof structure, made of more than 9,000 tons of steel, consists of two 177 meters east-west trusses and four 144 meters cross trusses. The retractable roof slides on the inner cross trusses, divided into two panels composed of five 72×7 meters inflatable cushions between six 72.5 meters-span steel-composite hybrid trusses. At the ends are motorized bogies that carry out the translation and integrate the lifting mechanism.
During the assembly process, the main trusses, which served as guides for the other trusses, transferred vertical loads to the two new evacuation towers on the west side and two articulated pendulums integrated into the building on the east side, while horizontal loads were completely decoupled from the existing structure. The stadium redevelopment also includes the installation of a video scoreboard.
The main trusses, which during assembly are the guide for the rest, transfer the vertical load to two new evacuation towers to the west and to two articulated pendulums integrated into the East Building, which in turn gathers horizontal forces next to the towers, completely independently of the existing structure.
The top of the arch is a 16.5-meter-high latticework that, together with the two towers, forms a mega-porch duckway. This supports the skywalk, a passageway.
The East Building consists of 11 floors formed by 21 radial frames to the existing stadium, with two pillars, rigid nodes, transversal purlins, and a steel deck. At the ends, the building is stiffened with concrete cores that house lifts and evacuation staircases. In the upper zone, there is a spatial lattice crown, which is linked to the west through the corbels of the trusses at the bottom of the fixed roof, allowing complete circulation around the stadium.
The shape of the new exterior façade is obtained from the sweep of three curved lines that define the four main areas of the façade. Between the upper and intermediate façade, there is a crack that makes it independent from the rest of the parts. This intermediate façade of stainless-steel slats is supported by a structure of hollow steel ribs on the stadium axes and hangs from the new fixed roof, resting horizontally on the existing concrete ribs.
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