| Arch: timbers cut and fitted to form a symmetrical portion of a circle, attached to posts for added strength: ends rest on abutments below lower chord |
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| Brace: a diagonal timber which slopes upward toward the center of the bridge |
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| Chord: the horizontal timber or timbers forming part of the truss; lower chord supports the floor, upper chord supports the roof |
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| Counter brace: a diagonal timber or rod which slants upward away from the center of the bridge |
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| Deck: the floor or roadbed of the bridge |
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| Diagonal: a timber or rod which slants, usually between two panel posts |
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| Flared Post: a post with the top slanting toward the end of the bridge |
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| Foot Piece: a specially designed casting, usually placed between diagonals and chords for rigid assembly of members |
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| Laminated Arch: a series of planks bolted together with staggered joints to form an arch; used in lieu of solid timber |
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| Overhang: portion of siding or roof extending beyond span timbers, for added protection; it can be from 0 up to 18 feet |
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| Panel: that portion of a truss included between two vertical posts |
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| Post: a vertical or upright timber in a truss; wood replaced by iron rods in Howe trusses |
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| Span or Clear Span: the length of a bridge between abutments or piers. A truss span is the length between the end posts |
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| Truss: an arrangement of timbers and rods to rigidly support each other as well as loads put on the roadway. This requires the use of a suitable combination of triangles ... in short, the truss is the weight bearing support structure of any bridge. |
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