Question

Which structural element ideally carries only axial forces?

• A. Beam
• B. Column
• C. Truss member
• D. Slab

Hint:

Remember: Truss = Only tension/compression (axial force).

Answer 1

The Correct Option is C

Concept: Structural elements are designed to carry different types of loads such as axial forces, bending moments, and shear forces.
Step 1: Understanding axial force.
Axial force acts along the length of a member, either in tension or compression.
Step 2: Behavior of truss members.
In an ideal truss, members are connected by pin joints and carry only axial forces (tension or compression), with no bending moment.
Step 3: Evaluating the options.

• Beam $\rightarrow$ Carries bending and shear (incorrect)
• Column $\rightarrow$ Mainly compression but may have bending (incorrect)
• Truss member $\rightarrow$ Carries only axial force (correct)
• Slab $\rightarrow$ Carries bending (incorrect)

Step 4: Conclusion.
Thus, a truss member ideally carries only axial forces.