In der aktuellen Baupraxis werden mit Standard-Tragelementen meist rechteckige Grundrisse erzeugt. Ausgenommen sind weitspannende Konstruktionen, wie Kuppeln von Domen oder Kühltürme von Kraftwerken. Im Gegensatz dazu waren Schalen aus Stahlbeton im Hochbau im vergangenen Jahrhundert weit verbreitet. Dazu wurden in der Regel große Strukturen in situ betoniert. Zusätzlich wurden weit spannende Fertigteile mit relativ geringer Breite hergestellt. Diese Faltwerke oder doppelt gekrümmten Elemente wurden zum Teil mit einer Dicke von weniger als 10 cm realisiert und häuf g im sofortigen Verbund vorgespannt. Bedenken hinsichtlich der Korrosionsbeständigkeit können ein Grund dafür gewesen sein, dass solche Konstruktionen heute üblicherweise nicht mehr gebaut werden. [Aus. Einleitung] / In current building practice, standard load-bearing elements are mostly of rectangular shape. Exceptions are large shell structures, such as cupolas of domes or cooling towers of power plants. In contrast, shells made of reinforced concrete (RC were widely applied for building construction in the last century. For this purpose, large structures were usually cast in situ. Additionally, long-span precast elements with limited width were produced. These folded plate or doubly curved elements were realised with a thickness of less than 10 cm and usually prestressed with steel tendons. Concerns regarding the corrosion resistance might have been a reason that such constructions are not build regularly today. [Off: Introduction]

There was developed a novel technological and constructive approach for the low-cost production of curved freeform formworks, which allow the production of single and double-curved fibre reinforced concrete. The scheduled approach was based on a flexible, asymmetrical multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). By using of the unusual anisotropic structural behavior, these GFRP formwork elements permitted a specific adjustment of defined curvature. The system design of the developed GFRP formwork was examined exhaustively. There were designed, numerically computed and produced prototypical curved freeform surfaces with different curvature radii. The fibre reinforced concrete had a compressive strength of 101.4 MPa and a 3-point bending tensile strength of 17.41 MPa. Beyond that, it was ensured that the TRC had a high durability, which has been shown by the capillary suction of de-icing solution and freeze thaw test with a total amount of scaled material of 874 g/m² and a relative dynamic E-Modulus of 100% after 28 freeze-thaw cycles.

There was developed a novel technological and constructive approach for the low-cost production of curved freeform formworks, which allow the production of single and double-curved fibre reinforced concrete. The scheduled approach was based on a flexible, asymmetrical multi-layered formwork system, which consists of glass-fibre reinforced plastic (GFRP). By using of the unusual anisotropic structural behavior, these GFRP formwork elements permitted a specific adjustment of defined curvature. The system design of the developed GFRP formwork was examined exhaustively. There were designed, numerically computed and produced prototypical curved freeform surfaces with different curvature radii. The fibre reinforced concrete had a compressive strength of 101.4 MPa and a 3-point bending tensile strength of 17.41 MPa. Beyond that, it was ensured that the TRC had a high durability, which has been shown by the capillary suction of de-icing solution and freeze thaw test with a total amount of scaled material of 874 g/m² and a relative dynamic E-Modulus of 100% after 28 freeze-thaw cycles.