Reciprocal Frame Structures
Reciprocal frames (RF) are a family of structures that increasingly are attracting interest from many participants in the construction industry.
They offer architectural opportunities through their expressive form and structural advantages due to their specific configuration.
A possible definition of a reciprocal frame is a grid of linear members where each member simultaneously supports and is supported by its neighboring members.
Therefore, the members are structurally interdependent and in a structural hierarchy of equal importance.
Although the basic RF configurations are typically used to enclose a regular rectangular/polygonal plan form, current built cases have also presented reciprocal frames with irregular shapes.
Up-to-date digital design tools enable a broad spectrum of opportunities for RFs, facilitating the design and fabrication of complex RF geometries and building typologies for diverse purposes.
Reciprocal frames have been known for centuries, and there are numerous examples from the Middle Ages, Renaissance, and later periods from studies/drawings and built examples.
Traditionally these frames were made of wood, the most readily available linear building material. They were used in buildings and bridges for permanent and temporary structures.
Reciprocal frames are also known under the term nexorades in some literature. The British inventor Graham Brown built a number of reciprocal frames and coined the term reciprocal frames in the 1980s.
Historically they were used in flat beam systems for forming floors in covered spaces where the span exceeded the available timber lengths, spanning over circular or rectangular spaces, as illustrated by Sebastiano Serlio.
Leonardo da Vinci sketched reciprocal frames as temporary bridges using a system of timber beams to create a simple structure with relatively short timber members and simple connections, which would have been easy to construct.
Text Source: Reciprocal Frame Structures / structuremag
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