A reciprocal frame is a class of self-supporting structure made of three or more beams and which requires no center support to create roofs, bridges or similar structures. == Construction == Reciprocal roofs tend to be constructed in one of two ways.
A reciprocal frame is a class of self-supporting structure made of three or more beams and which requires no center support to create roofs, bridges or similar structures. == Construction == Reciprocal roofs tend to be constructed in one of two ways.
Source: Wikipedia "Reciprocal frame" · CC BY-SA 4.0
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