In a parallel chord truss, what are the top and bottom members called?

In a parallel chord truss, the members that run horizontally at the top and bottom are referred to as chords. These chords serve a critical role in the truss's structural integrity by transferring loads and maintaining the overall shape of the truss during various stresses.

The top chord typically supports the load applied from above (like roofing), while the bottom chord helps to stabilize the truss against bending and can support additional loads as needed. Their parallel orientation is essential for the efficiency of the truss design, as it allows for uniform distribution of forces throughout the structure.

Understanding the function of chords is fundamental for anyone studying truss systems, especially in the context of construction and fire safety, as it enables better decision-making regarding the strengths and weaknesses of structural elements in various operational scenarios.