Bowstring girder

an arched beam strengthened by a tie connecting its two ends.

etc. See under Bowstring, Box, etc.

bowstring girder

bowstring beam, bowstring girder, bowstring truss

A beam, girder, or truss having one curved member in the shape of a bow (often circular or parabolic in shape) and a straight or cambered member which ties together the two ends of the bow.

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