Chapter 14- Collapse Flashcards Preview

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Flashcards in Chapter 14- Collapse Deck (18)
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__ __ is perhaps the greatest collapse danger to fire fighters today, given the complete proliferation of this type of construction throughout the country.

Lightweight construction


__ collapses can and do happen during search and rescue operations.



Braced frame buildings are particularly susceptible to this type of collapse.

Inward outward collapse


Tilt wall failure (which can fall in or out) is an example of a __ collapse.

90 degree


A collapse in which an entire wall fails as one unit.

90 degree wall collapse


A collapse in which one end of the collapsed floor is supported by an interior wall, creating two void spaces.

A frame floor collapse


A collapse in which one end of the floor is still supported while the other end is unsupported. Voids can be created in such situations.

Cantilever floor collapse


Often associated with brick veneer non load bearing walls, but also including other masonry walls. The wall falls like a curtain--straight down.

Curtain wall collapse


Results in the complete failure of the building.

Global (total) collapse


A collapse in which the exterior wall fails horizontally, with the interior wall folding horizontally. The top portion of the building fails inward while the bottom half fails outward.

Inward outward collapse


Limited to wood frame structures, this type of collapse is characterized by a wooden building that shifts at the upper levels, leaning into adjacent buildings or totally collapsing sideways in the absence of adjacent buildings.

Lean over collapse


A collapse of a buildings floors in which one end of the floor is still supported, sometimes at or near the original point of connection to the wall. A triangular void space is created.

Lean to floor collapse


A collapse of a building's floors (and possibly roof) in a pancake stack fashion with each floor (roof) laying flat on top of the one below.

Pancake collapse


Results from a failure of a portion of the building. A situation in which a section of floor gives way without bringing down the rest of the building would be a partial collapse. A partial collapse can be just as deadly as a global collapse.

Partial collapse


Extensive structural failure initiated by local structural damage or a chain reaction of failures following damage to a small portion of a structure.

Progressive collapse


An additional collapse that occurs after the initial collapse. Often occurs when loads shift after a primary collapse, causing additional portions of the structure to fail.

Secondary collapse


In firefighting terms, the perception of the surroundings of time and space, the understanding and comprehension of these observations, and the projected outcome of a change in these conditions.

Situational awareness


A collapse in which the floor fails near its center, with the perimeter of the floor still partially supported by the walls. Two voids are created in this type of collapse.

V shaped floor collapse