New bridge over the Ticino river (Italy)

The work of art in question extends for approximately 488m and consists of two central arched spans of 150m each and two lateral access viaducts of 94m in length. The main structural system is represented by two arches made with a steel box structure, injected with self-compacting concrete. The arches are embedded in the foundations. The decks, in C.A.P. cast on site, they consist of a continuous double – caisson girder, with a total width of 26.80m. They are connected to the arches by means of a system of steel hangers. The piles in the bed of the arches are made with a three-dimensional structure in reinforced concrete. cast in situ, while the piles of the access viaducts are hollow trunks always in reinforced concrete. cast in place. For both types of piles, the construction of deep pit foundations was planned with the use of large diameter reinforced concrete piles. Both global resistance and deformability analyzes were performed on this work of art during the launching phases of the metal arches (Construction Stage Analysis) and detailed analyzes to investigate the presence of any local instability phenomena. In addition, the temporary connection elements between the various metal macro-segments constituting the arches (friction bolted joints) were designed and verified. Finally, the entire system of lifting and temporary suspension of the macroconci was designed and tested.