Semi-precast segmental bridges: Development of a new construction method using thin-walled prefabricated concrete elements

In order to understand the overall picture, the different technologies for the use of thin-walled prefabricated elements in bridge construction as well as the first-time application of them in a bridge project in Austria are described in this paper. Thereafter a newly developed construction method for the on-site fabrication of lightweight box-shaped segments from thin-walled concrete elements, strengthened with steel girders, is explained with the focus lying on the construction of a prototype in a 1:1 scaling. The conceptional design, the manufacturing in a prefabrication plant in Austria and the transport to a construction site are illustrated. Finally, an application example of the new technology is shown based on a design using the incremental launching method. The research confirms the feasibility of the on-site assembly of segments from thin-walled prefabricated elements and that this construction method, once minor constructive details will be solved in the ongoing research project, has great potential for a broad application in bridge construction.