Fresh concrete pressure on inclined or curved formwork

摘要

Architects increasingly use free formed concrete units as design elements. Lightweight shell structures, for instance Florante Submarino in Valencia, are built up of a thin concrete membrane with variable inclinations. The pressure of fresh concrete is the most important load for the design of the formwork and has important effects on the construction costs. In Germany the calculation of the pressure on formwork has to be determined according to DIN 18218. The standard indicates rules for vertical forms and formwork with a maximum deviation of 5 degree to the vertical axis. Inclined formworks are analyzed and designed according to simplified models, which normally lead to an oversize of the formwork construction. This paper deals with the pressure of fresh concrete on inclined and curved formworks. The related research project "Entwicklung der Grundlagen zur Entwicklung adaptiver Schalungssysteme fuer frei geformte Betonbauteile" (Basics for the development of adaptive formwork systems for free-formed concrete structures) belongs to the DFG Schwerpunktprogramm (SPP) 1542 (Priority Programme 1542 of the German Research Foundation): ,,Leicht bauen mit Beton" (Light concrete structures). Extensive numeric investigations, based on a FE-model, are conducted. Further on the experimental setup for large-scale tests are shown, as well as the test program.