This paper reports about the development and implementation of a free forming facade system, consisting of biobased sandwich elements. The build-up of the sandwich contains face sheets from natural fibre reinforced polymer (NFRP), using biobased epoxy resin and flax fibres, and a stuck cardboard core structure. Furthermore a formwork system was designed enabling biobased sandwich elements to be produced with special needs according to efficiency and architectural design. As a result, the biobased and sustainable sandwich elements exhibit low system weight, high sound reduction and sufficient load capacity for the use of facade elements. Additionally LED-stripes were integrated for illuminating the facade elements. Because of the regular pattern of the stuck cardboard core and the translucent face sheet laminates the facade works like a screen on which each created pixel can be controlled in rgb-colours. Therefore an area of 10 m x 5 m biobased sandwich facade with 25 elements is planned as a reference object in Chemnitz, forming a facade with 100 x 48 pixels. In summary the illuminated biobased sandwich elements produced with an efficient technology of production and with the use of renewable resources can replace extensively 3D-formed customary facade systems.

Modern architecture is dominated by the tendency to design organically shaped filigree buildings. The resource and energy efficient construction of multifunctional buildings is as important as a broad variety of possible shapes. Multi-material support structures and shell constructions in lightweight design that also take over e. g. lighting and monitoring are needed for these purposes. Textile reinforced lightweight shell structures have been developed at Technische Universität Chemnitz within the scope of research projects. They consist of a hybrid material from carbon-fiber-reinforced concrete and glass-fiber-reinforced plastic. Thanks to the coupling of the positive material characteristics, the combination of two different composite materials results in a hybrid material with a total thickness of 15 mm, which has a high fatigue strength (XF4) and surface quality (exposed concrete). Furthermore, the hybrid is characterized by excellent compressive strength (120 MPa) and bending tensile strength (150 MPa), low susceptibility to corrosion and free formability. Therefore, it is highly suitable for thin-walled filigree lightweight shell structures. A research pavilion with a size of 4 x 4 x 3 m3 (l x w x h), made from textile reinforced lightweight shells, was built on the campus of TU Chemnitz, to test the theoretical investigations. Specially developed tensile sensors for the active lighting and determination of the elongations were integrated into the different layers. This aimed at an online-monitoring of the shell support structure.

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