1. Tension is the magnitude of the pulling force exerted by a string, cable, chain, or similar object on another object.
2. Compression is the result of the subjection of a material to compressive stress, which results in reduction of volume as compared to an uncompressed but otherwise identical state.
3. Through Truss a bridge composed of connected elements (typically straight) which may be stressed from tension, compression, or sometimes both in response to dynamic loads.
4. Pony Truss a through bridge truss having its deck between the top and bottom chords and having no top lateral bracing.
5. Deck Truss The deck truss, which places its supporting framework below the road, made a good choice in cases where enough room existed below
6. Force is any influence that causes a free body to undergo a change in speed, a change in direction, or a change in shape.
7. Load are forces applied to a component of a structure or to the structure as a unit.
8. Deck a flat surface capable of supporting weight, similar to a floor, but typically constructed outdoors, often elevated from the ground, and usually connected to a building.
9. Yield Stress marking the transition from elastic to plastic behaviour, is the minimum stress at which a solid will undergo permanent deformation or plastic
10. Span The extent or measure of space between two points or extremities, as of a bridge or roof; the breadth.
11. Buckling is a mathematical instability, leading to a failure mode. Theoretically, buckling is caused by a bifurcation in the solution to the equations of static equilibrium.
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