What term describes the presence of multiple load paths so that, if a structural member fails, another element or group of elements can sustain the load?

• A. Redundancy
• B. Rehabilitation
• C. Reinforced Earth
• D. Relaxation

Answer: (A)

Redundancy in structural design means building in more than one load path so that if one element fails, other elements can carry the load and keep the structure standing. This is the safety mechanism that prevents a small local failure from causing a total collapse, by redistributing forces to intact parts of the system. In bridges and other structures, redundancy helps withstand accidental damage, deterioration, or unexpected loads because the structure has multiple ways to transfer forces to supports.

Rehabilitation would refer to repairing or strengthening an existing structure to restore its performance, which is about bringing a structure back to service rather than about how loads are carried. Reinforced Earth describes a soil-structure system where soil is stabilized with reinforcement for retaining walls or embankments, not about multiple load paths within a structure. Relaxation is a material phenomenon where stress decreases under constant strain (or prestress reduces over time), not about creating alternate routes for loads.