BC Ch. 15 Definitions

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Questions and Answers

What characterizes a 90-degree wall collapse?

A collapse where an entire wall fails as one unit (correct)
A partial collapse of a floor
A collapse that occurs after the initial collapse
A floor collapse with two void spaces

What defines an A-frame floor collapse?

A collapse where one end of the floor is supported by an interior wall, creating two void spaces (correct)
A collapse of a floor near its center
A collapse where both ends of a floor are unsupported
A collapse resulting in the complete failure of the building

Which description fits a Cantilever floor collapse?

A collapse of a building’s wall only
A collapse where one end of the floor is supported, and the other is unsupported, potentially creating voids (correct)
A collapse where the entire building fails
A collapse where the floor fails in a pancake fashion

What is a Curtain wall collapse characterized by?

A collapse where the wall falls like a curtain—straight down (C) Signup and view all the answers

What occurs during a Global (total) collapse?

A collapse resulting in the complete failure of the building (A) Signup and view all the answers

Which of the following is NOT a feature of a Cantilever floor collapse?

The floor has both ends supported (A) Signup and view all the answers

In which scenario would a Global collapse not be appropriate?

When only certain floors of a building fail (C) Signup and view all the answers

What is the implication of an Inward-outward collapse?

Both inward and outward failures occur simultaneously (A) Signup and view all the answers

What characterizes a Pancake collapse?

A collapse where the floors and possibly the roof lay flat on top of one another (D) Signup and view all the answers

Which statement accurately describes a Lean-to-floor collapse?

A collapse where one end of the floor is still supported, creating a triangular void space (D) Signup and view all the answers

What defines a Lean-over collapse?

It involves leaning into adjacent buildings or collapsing sideways (B) Signup and view all the answers

What is a key feature of a Secondary collapse?

It occurs after the initial collapse due to shifting loads (C) Signup and view all the answers

Which of the following best describes a Progressive collapse?

An extensive structural failure caused by local damage leading to a chain reaction (A) Signup and view all the answers

What indicates a V-shaped floor collapse?

The floor fails near its center with the perimeter still supported (C) Signup and view all the answers

What is essential to Situational Awareness in firefighting?

Understanding surroundings in terms of time and space and predicting outcomes (D) Signup and view all the answers

What characterizes a Partial collapse?

A failure of a part of the building without affecting the whole structure (A) Signup and view all the answers

Which statement correctly describes the nature of a Lean-over collapse?

It is primarily seen in wood-frame structures (A) Signup and view all the answers

What is a specific characteristic of a complete building collapse?

All structural elements fail simultaneously (B) Signup and view all the answers

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Study Notes

Types of Collapses

90-Degree Wall Collapse
- Entire wall fails as a single unit.
A-Frame Floor Collapse
- One end supported by an interior wall, creating two void spaces.
Cantilever Floor Collapse
- One end supported, other end unsupported, potentially creating voids.
Curtain Wall Collapse
- Wall falls straight down, resembling a curtain.
Global (Total) Collapse
- Complete failure of the building, not limited to floors or sections.
Inward-Outward Collapse
- Exterior wall fails horizontally, while interior wall folds horizontally.
Lean-Over Collapse
- Limited to wood-frame structures; building leans toward adjacent buildings.
Lean-To-Floor Collapse
- One end unsupported, creating a triangular void space.
Pancake Collapse
- Floors and possibly roof lay flat on top of one another.
Partial Collapse
- Failure of a part of the building, such as a section of the floor, without total collapse.
Progressive Collapse
- Local structural damage triggers extensive failures, a chain reaction affecting larger sections.
Secondary Collapse
- Occurs after the initial collapse due to shifting loads.

Firefighting Concepts

Situational Awareness
- Understanding surroundings in relation to time and space and predicting outcomes based on changes.
V-Shaped Floor Collapse
- Floor fails near the center while perimeter remains supported, creating two voids.