As vertical loads are applied, a flexible culvert attempts to do what?

As vertical loads are applied, a flexible culvert attempts to do what?

• A. Deflect
• B. Rotate
• C. Expand
• D. Crack

Answer: (A)

When vertical loads are applied, a flexible culvert bends and moves downward—that deflection is the primary response. This happens because the culvert acts like a bending member, with the load creating bending moments along its length and the surrounding soil allowing the pipe to sag rather than resisting it rigidly. Expansion is unlikely because the soil surrounding the culvert constrains any outward growth, and rotation isn’t the main outcome unless loads are highly uneven or produce twisting. Cracking could occur if bending stresses exceed the material strength, but the most characteristic behavior under vertical loading for a flexible culvert is deflection.

When vertical loads are applied, a flexible culvert bends and moves downward—that deflection is the primary response. This happens because the culvert acts like a bending member, with the load creating bending moments along its length and the surrounding soil allowing the pipe to sag rather than resisting it rigidly. Expansion is unlikely because the soil surrounding the culvert constrains any outward growth, and rotation isn’t the main outcome unless loads are highly uneven or produce twisting. Cracking could occur if bending stresses exceed the material strength, but the most characteristic behavior under vertical loading for a flexible culvert is deflection.