What is a fracture-critical member and why is it inspected annually?

• A. A decorative element on the bridge.
• B. A non-load-bearing piece of equipment.
• C. A member whose failure could cause collapse due to lack of redundancy; inspected annually to detect hidden deterioration.
• D. A section of deck that is replaced every year.

Answer: (C)

A fracture-critical member is a structural element whose failure could cause a bridge to collapse because there is no alternative load path to carry the load if that member fails. That lack of redundancy makes its integrity crucial, so any hidden deterioration could lead to a sudden, catastrophic event.

It’s inspected annually because the potential deterioration can be hidden inside connections, in tight areas, or under coatings, and a failure could progress quickly without obvious warning. Regular annual checks aim to catch cracks, corrosion, wear, or misalignment before they grow to a level that could initiate collapse. Inspections may include close visual checks and non-destructive testing techniques as needed to reveal hidden damage.

The other options don’t fit because a fracture-critical member isn’t just decorative, isn’t non-load-bearing, and isn’t simply a section of deck that is replaced every year.