Structural Health Monitoring of the Scherkondetalbrücke: a semi integral concrete railway bridge Semi integral bridges are characterized by the monolithic connection between the superstructure and the piers. Thereby every element of the structure participates to the transfer of forces due to traffic loads. Simultaneously, high constraining forces due to thermal variation, creep, shrinkage or settlements appears. These forces have to be accurately taken into account when designing the bridge and should be reduced through an advantageous distribution of the stiffness, especially in the substructure. The construction of semi integral bridges in the case of long viaducts is an innovation, also on international scale. In order to limit the risks associated with this non-definitively regulated type of structure and in order to collect experience about the calculation assumptions, the authorities required an extensive monitoring of the bridges. In this paper, a few results of the long-term measurements on the Scherkondetalbrücke will be presented.