Which collapse description matches a situation where one side remains supported and the other drops?

Which collapse description matches a situation where one side remains supported and the other drops?

• A. V-Type
• B. W-Shape
• C. Pancake
• D. Lean-To

Answer: (D)

Think about how a building can fail along a single plane while one edge stays strong. A lean-to collapse is when one side remains supported while the opposite side drops, making the structure lean to one side. That exactly matches a situation where part of the structure stays intact on one end while the other end sinks. Pancake collapses involve floors or layers falling straight down onto each other, forming horizontal layers rather than a single tilted plane. A V-type collapse has two sides falling toward each other to meet at a point, so there isn’t a single supported side. A W-shape collapse shows a more complex, multi-segment failure, not just a single-sided drop.

Think about how a building can fail along a single plane while one edge stays strong. A lean-to collapse is when one side remains supported while the opposite side drops, making the structure lean to one side. That exactly matches a situation where part of the structure stays intact on one end while the other end sinks.

Pancake collapses involve floors or layers falling straight down onto each other, forming horizontal layers rather than a single tilted plane. A V-type collapse has two sides falling toward each other to meet at a point, so there isn’t a single supported side. A W-shape collapse shows a more complex, multi-segment failure, not just a single-sided drop.