Fundamentals of Development for Adaptive Formwork for Free Formed Concrete Shells and Walls (2014-12)¶

In the case of curved concrete structures, the formwork determines the cost significantly. Form-active, free-form concrete structures such as formwork structures are efficient load-bearing systems, but are often uneconomical due to high formwork costs. Changeable formwork for such in-situ concrete structures, which can be used several times and can be computer-assisted into different shapes, will have a positive impact on the implementation and distribution of such structures. This article reports on the findings of basic research into adaptive two-sided formwork systems for in-situ concrete shells and walls, which is being carried out as part of the DFG priority program 'Lightweight construction with concrete'. It describes the typologies of actuator-shell systems found, their various modes of operation, requirements and geometric laws. The development of a material structure is used to deal with the inherent contradiction that an adaptive formwork material must withstand high fresh concrete pressures, but at the same time be 'soft' for forming.