ADEGUAMENTO STATICO MEDIANTE PRECOMPRESSIONE ESTERNA DEL PONTE FERROVIARIO SUL TERDOPPIO

The technology of external prestressing is now used more and more in reparation and adjustment of existing structures. Particularly this technique of reinforcement is applied with success to bridge structures and, in the following, a real case of this technique will be illustrated on a railway bridge. During the construction of the railway line Turin-Novara, the Consortium Cav.TO-MI had the necessity to utilize the bridge "Terdoppio” for the transit of the railway trains that had to serve to the placing of the equipment of the railway line. For the design of the reinforcement system, has been taken into account the presence of bonded and unbonded prestressing, also making use of some models of interaction between the different internal forces as proposed recently in literature. Today the bridge of “Terdoppio” is in service and the reinforcement has involved a substantial economy in the costs.The technology of external prestressing is now used more and more in reparation and adjustment of existing structures. Particularly this technique of reinforcement is applied with success to bridge structures and, in the following, a real case of this technique will be illustrated on a railway bridge. During the construction of the railway line Turin-Novara, the Consortium Cav.TO-MI had the necessity to utilize the bridge "Terdoppio” for the transit of the railway trains that had to serve to the placing of the equipment of the railway line. For the design of the reinforcement system, has been taken into account the presence of bonded and unbonded prestressing, also making use of some models of interaction between the different internal forces as proposed recently in literature. Today the bridge of “Terdoppio” is in service and the reinforcement has involved a substantial economy in the costs.