Which of the following statements about redundancy checks is true?

• A. It is quantified by redundancy index or number of independent load paths.
• B. It is used only for torsional loads.
• C. It is the same as stiffness calculation.
• D. It has no relation to safety.

Answer: (D)

Redundancy in a structure means having more load paths than the minimum needed to keep the structure stable, so loads can be redistributed if one path is damaged. This idea is captured by a redundancy index or by counting independent load paths. Because it measures alternative ways loads can travel through the system, redundancy directly enhances safety by reducing the risk of progressive collapse after a member or connection fails. It applies to all load types, not just torsion, and it is not the same as stiffness, which describes how much a structure deforms under a given load. So saying it has no relation to safety would be incorrect.