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The Burr Arch covered bridge is an American classic timber-framed design from the last century. The need to repair these magnificent bridges has lead to debates about the design, whether the bridge is a trussed structure strengthened by an arch brace on either side or, conversely, whether the bridge is an arched structure strengthened by cross bracing on either side. This short article takes the view that there is no argument and that the two elements of the design arose simultaneously as a geometrical design, geometry being the state of the art design methodology of the time.

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