Reciprocal Frame (RF) Structures: Real and Exploratory

Abstract

The paper presents the opportunities and challenges of reciprocal frame (RF) structures. These are discussed through some recently built, innovative examples such as the Mount Rokko-Shidare Observatory in Japan and the Kreod Pavilion in UK, as well as through the explorations with physical models in both small and full scale carried out over the last few years at The Royal Danish Academy of Fine Arts School of Architecture in Copenhagen. The RF structure gives the potential for achieving novel and expressive curved three-dimensional complex forms, using straight members. At the same time, it offers the possibility for fast and simple construction using low-tech techniques and simple joints. This makes it a possible solution for many types of applications, ranging from short-span canopies, to geometrically complex structural forms, to rapidly constructed emergency shelters after disasters. No other structural system can offer the same level of variability and scope for different applications.

Form finding of nexorades using the translations method

“…Among recent projects, the KREOD pavilion demonstrates an interrelation between detailing and geometry 2 . The Mount Rokko-Shidare Observatory is one of the largest nexorades built to date [28]. Finally, the roof over an archeological site in Bibracte, France is a good example offered by nexorades with zero eccentricity [29].…”

The role of symmetry in reciprocal frame structures

“…Although the arrangement of staves is not irregular, the canopy is tiled with Voronoi cells in order to give the viewer a more familiar impression. Voronoi cells occur in nature, and its aperiodic tessellation is capable of modifying the distance between the frame elements in accordance with the actual stresses (Popovic Larsen, 2014;Goto, Ryota, and Matsuo, 2011).…”

Study on Adjustable Connector of Reciprocal Frame

“…Figure1 indicates a common circular reciprocal frame [4]. Thanks to its unique and mutually supported feature, the members and connectors of reciprocal frame are in a simple and unified structure [5]. Therefore, reciprocal frame can simplify the on-site assembling process and draws an extensive attention in the field of prefabricated building [6][7][8].…”