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{{#invoke:Hatnote|hatnote}} In engineering, a truss is a structure that "consists of two-force members only, where the members are organized so that the assemblage as a whole behaves as a single object".<ref name="PleshaGrayCostanzo">{{#invoke:citation/CS1|citation |CitationClass=book }}</ref> A "two-force member" is a structural component where force is applied to only two points. Although this rigorous definition allows the members to have any shape connected in any stable configuration, trusses typically comprise five or more triangular units constructed with straight members whose ends are connected at joints referred to as nodes. In this typical context, external forces and reactions to those forces are considered to act only at the nodes and result in forces in the members which are either tensile or compressive. For straight members, moments (torques) are explicitly excluded because, and only because, all the joints in a truss are treated as revolutes, as is necessary for the links to be two-force members.

A planar truss is one where all the members and nodes lie within a two dimensional plane, while a space truss has members and nodes extending into three dimensions. The top beams in a truss are called top chords and are typically in compression, the bottom beams are called bottom chords and are typically in tension, the interior beams are called webs, and the areas inside the webs are called panels.<ref>Ching, Frank. A Visual Dictionary of Architecture. 2nd ed. Hoboken, N.J.: Wiley, 2012. 277. Print. ISBN 9780470648858</ref>

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Truss bridge for a single-track railway, converted to pedestrian use and pipeline support
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An Egyptian ship with a rope truss, the oldest known use of trusses. Trusses did not come into common use until the Roman era.

Truss sections
Intro   Etymology of truss    Characteristics of trusses   Truss types  Statics of trusses  Analysis of trusses  Applications  Gallery   See also    References   

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