Open web truss top chords are typically in which state?

• A. Compression
• B. Tension
• C. Shear
• D. Bending

Answer: (A)

When you analyze an open web truss under typical vertical loads, the load path runs through the triangles, turning the joints into pins and the members into axial elements. The diagonals push outward on the top chord, producing a compressive force in the upper row of members. In contrast, the bottom chord is pulled to resist that outward thrust, so it stays in tension. Because truss members are assumed to carry axial forces with joints acting as pins, the top chord ends up primarily in compression, while bending and shear are not the primary actions in these members.