Our research on the design of bridges as designed by the State Engineer's Office.
Historical Data on Bridge Construction
from Design of Highway Bridges by Milo S. Ketchum,
1908, and 1920 editions.
Schematic diagram of a through Pratt truss, illustrating the various members and their names. Members in compression are in heavy lines, tension in light.
A truss is a framework composed of individual members so fastened together that loads applied at the joints produce only direct tension or compression. The triangle is the only geometrical figure in which the form is changed only by changing the lengths of the sides. In its simplest form every truss is a triangle or a combination of triangles. The members of the truss are either fastened together with pins, pin-connected, or with plates and rivets, riveted.
We also have a page tracking the design of bridges as designed by the State Engineer's Office.
Through types. Note: the type shown at (f) is commonly referred to nowadays as a Parker Truss, after the railroad engineer who first designed the type. Camelback is today reserved to refer to a Parker truss with only 5 slopes.
Short or Pony truss types, including beam spans. Truss leg and beam leg bridges are commonly called "beadstead" bridges.
Plans and details for Steel Truss Bridges
Plans for Timber Bridges
Plans for Concrete Bridges
Plans and Photographs of Bridges
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