The roof of the Sports Pavilion of Oviedo constitutes a milestone in the history of concrete shells and it is the culmination of Mr. Ildefonso Sánchez del Río work, in which he demonstrated the efficiency of the construction system constituted by arches with a curved and thin cross section for great spans.
Three main volumes constitute the building roof: a central one, formed by 8 arches of 100 m of span and two lateral ones composed of 2 arches of 90 m of span. The directrix of the arches is a fourth degree (bi-quadratic) parabola, by approximation to the catenary curve that would be the theoretical anti-funicular form of uniformly distributed vertical load. The articulation of the arches is materialized by means of seven bars, of 60 mm diameter, that constitute a structural hinge.
The first report written by MC2 had the purpose of evaluating the current state of the roof structure and establishing its safety coefficient once subjected to the loads corresponding to an additional roof waterproofing and a new video-marker. Therefore, a scanning was carried out using a laser system, generating a cloud of points that, superimposed on the theoretical geometry, allowed to detect a maximum deviation, in the key of an arch, of 76 mm with respect to the ideal anti-funicular form, circumstance consistent with the long-term expected behaviour. On the one hand, a 3D beam-type FEM model of an arch has been used for the non-linear analysis of the overall buckling of the arch in its plane.
On the other hand, a more complex 3D FEM model, using shell elements, has been employed to check the possible local buckling of the arches. The roof complies with the structural requirements defined by the regulations.Moreover, a project for the rehabilitation of the structural hinges has been carried out, in order to repair all the detected pathologies: corrosion of F60 bars, cracks in their chrome protecting covers and surface cracking in the concrete elements.