What term describes a collapse that occurs after the initial collapse?

What term describes a collapse that occurs after the initial collapse?

• A. Secondary collapse
• B. Delayed collapse
• C. Progressive collapse
• D. Final collapse

Answer: (A)

In collapses, after the first failure, additional parts of the structure can fail as loads are redistributed, damaged elements loosen, and debris adds weight. The term for that following collapse is secondary collapse. It describes a later collapse of other structural components that occurs as the initial event changes the forces on the remaining members. This is different from progressive collapse, which is a broader chain reaction throughout a larger portion of the structure, whereas secondary collapse refers to the subsequent failure of nearby members after the initial break. For example, when a floor or column fails, the loads are transferred to adjacent elements, which may then fail in turn, producing a secondary collapse.

In collapses, after the first failure, additional parts of the structure can fail as loads are redistributed, damaged elements loosen, and debris adds weight. The term for that following collapse is secondary collapse. It describes a later collapse of other structural components that occurs as the initial event changes the forces on the remaining members. This is different from progressive collapse, which is a broader chain reaction throughout a larger portion of the structure, whereas secondary collapse refers to the subsequent failure of nearby members after the initial break. For example, when a floor or column fails, the loads are transferred to adjacent elements, which may then fail in turn, producing a secondary collapse.