Bending-active reciprocal structures: geometric parameters and their stiffening effect

Bending-active reciprocal structures consist of elastically bent beams in a mutually supporting weave pattern in which each connection joins only two beams. Aside from the advantages for fabrication and assembly, this system has an extensive geometric potential, allowing reuse and reconfiguration. However, the load-bearing behaviour of these structures is limited by the required flexibility of the components. This paper discusses the impact of geometric parameters on the stiffness of bending-active reciprocal geometries for two cases: single-layered domes and double-layered components. It concludes by illustrating the use of the double-layered component for the development of a kit-of-parts structure: the ReciPlyDome. Thanks to the elastic capacity of the components and the very simple connections, the ReciPlyDome can be very easily and rapidly assembled and manufactured. This in contrast with the high technical complexity of many other kit-of-parts or grid structures. The analyses underline the importance of the form-force relationship when developing bending-active reciprocal structures and show the potential of active bending for the development of pre-assembled beam components. This research is framed within the wider scope of developing lightweight, transformable and temporary structures.