Architecture
A queen-post bridge has two uprights placed about one-third of the way from each bank. They are connected across the top by a beam and use a diagonal brace between the outer edge. The central square between the two verticals was either unbraced on shorter spans, or had diagonal braces from the bottom of each queen post to the center of the upper cord. The deck is supported by a king post, which is held up by a triangular truss.
An alternative truss construction used a pair of cross beams between the queen posts, forming an "X". This is then considered a Warren truss.
Read more about this topic: Queen Post
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