A queen post is a tension member in a truss that can span longer openings than a king post truss. A king post uses one central supporting post, whereas the queen post truss uses two. Even though it is a tension member, rather than a compression member, they are commonly still called a post. A queen post is often confused with a queen strut, one of two compression members in roof framing which do not form a truss in the engineering sense. The double punch truss appeared in Central Europe during the Renaissance.

Architecture

Queens Post P2100014 Day Bridge off Prosperity Pike (SR 18) PA

A queen-post bridge has two uprights, placed about one-third of the way from each end of the truss. They are connected across the top by a

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and use a diagonal brace between the outer edges. The central square between the two verticals is either unbraced (on shorter spans), or has one or two diagonal braces for rigidity. A single diagonal reaches between opposite corners; two diagonal braces may either reach from the bottom of each upright post to the center of the upper beam, or form a corner-to-corner "X" inside the square.American Barns and Covered Bridges, Eric Sloane, Wilfred Funk, Inc. New York, New York; 1954, pg 96-97

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Bridge Basics

King Post Truss vs Queen Post Truss
via YouTube Architectural elements Structural engineering Truss bridges by type {{architecturalelement-stub

Architecture

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