What characterizes a Parallel-Chord Truss?

A Parallel-Chord Truss is characterized by two parallel horizontal members—often referred to as chords—joined together by diagonal members, which help distribute loads effectively across the structure. The parallel arrangement of the chords allows for even load distribution and stability, while the diagonal members provide the necessary support to counteract forces acting upon the truss, such as compression and tension.

This design is common in various applications, including bridges and roofs, where the combination of horizontal stability and diagonal reinforcement optimizes strength while maintaining a lightweight structure. By contrast, other structures listed, such as a single horizontal member with vertical supports or configurations lacking diagonal connections, do not leverage the advantageous geometry of a truss system which is essential for handling tensile and compressive forces efficiently.