The Arch Stirrup

Scissors trusses, including those with curved bottom chords, can induce a lot of tension in the king post. This makes "the crux" an important and challenging connection. Curved bottom chords are working hard, especially at this central point, so we try to use all that king post tension to hold up the curve without doing any more damage than absolutely required to the curve. This stirrup does the job with virtually no cutting on the curve. This stirrup is attached to the king post and goes around the curved chord in order to be able to push up on it from the underside. The tension in the king post is turned into compression on the underside of the curved timber. There are wedges between the two stirrups to spread the load on the underside chord surface, while allowing for adjustment during assembly.

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