Tension-is an internal axial member fforcce that tends to lengthen a member
Compression- is an internal axial member force that tends to shorten a member
Through Truss-is a truss whose deck is located at or very near the bottom chord; thus vehicles pass between the two main trusses as they cross the bridge
Pony Truss- looks just like a through truss, except it is not as high and has no lateral bracing between the top chords.
Deck truss- is a truss whose deck is located at or very near thee top chord; thus vehicles cross the bridge on top of the trusses.
Force- a push or pull
Load-are forces applied to a structure
Deck-is the floor of a bridge.
Yield stress- is the strength of a metal. It is the force per unit area at which the metal fails by yielding.
Span- is its length from support to support
Buckling-is the principal failure mode of a member that is loaded in compression.

