Ch. 6 Wood floor collapse

Question 1

Defensive strategies to safeguard FF’s from a floor collapse danger are discussed in this chapter:
What does Dunn tell us to do for a deck collapse danger?

Answer 1

Use a tool to probe ahead or keep one leg outstretched and support the weight of the body with the back leg.

Question 2

Defensive strategies to safeguard FF’s from a floor collapse danger are discussed in this chapter:
What does Dunn tell us to do for a floor beam collapse danger?

Answer 2

Use the reach of the hose stream to stay away from the weakened floor or order a defensive outside attack.

Question 3

Defensive strategies to safeguard FF’s from a floor collapse danger are discussed in this chapter:
What does Dunn tell us to do for a multilevel floor collapse danger?

Answer 3

Withdraw FF’s from the bldg. and away from the walls of the bldg. Multilevel floor collapse can cause a progressive collapse of the walls. A collapse zone must be considered for wall collapse after the floors fail.

Question 4

The most dangerous time for floor collapse is during what stage of the fire?

Answer 4

The DECAY stage (after the fire has been extinguished).

Question 5

A multilevel floor collapse most often happens in burning Bldg.’s that have columns and girders supporting floors. A bldg. with a frontage of how many feet or more usually has columns and girders?

Answer 5

25 feet or more

Question 6

What are the priorities for firefighting in Fire resistive (class 1) Bldg.'s
****LISP****

Answer 6

• Life safety
• Incident Stability
• Property protection

Question 7

Out of the 3 ways a wood floor may fail during a fire; floor deck, floor beam, multilevel floor which is the most dangerous?

Answer 7

Multilevel floor collapse

Question 8

WHAT TYPE OF COLLAPSE?

A floor beam pulls away from a bearing wall at one end and the floor is supported by furnishings or content.

Answer 8

Supported lean to collapse

Question 9

WHAT TYPE OF COLLAPSE?

A bearing wall failure occurs at one end and there is no wall left to support the floor at the collapsed end.

Answer 9

Unsupported lean to collapse

Question 10

WHAT TYPE OF COLLAPSE?
An explosion that results in an exterior bearing wall failure at both ends, followed by a floor collapse in the center, and an interior partition supports the floor which is broken at the center.

Answer 10

Tent floor collapse

Question 11

WHAT TYPE OF COLLAPSE?
The floor collapses at the center and the exterior wall connection remain intact; this can be caused by center floor overload.

Answer 11

V-Shaped floor collapse

Question 12

Lightweight construction in High Rise bldg.’s calls for consideration of a new strategy instead of the “controlled burn” strategy.
-Consider full evacuation and withdrawal of FF’s from ______________ High rise bldg.’s
Fill in the Blank

Answer 12

Unoccupied

Question 13

Chiefs Question
In High rise bldg.’s, when fire rages out of control for hours. The IC should call on who to evaluate the bldg.’s stability

Answer 13

Structural engineers

Question 14

Chiefs Question
In High rise bldg.’s, when fire rages out of control for hours. If FF’s have been withdrawn continue to supply what?
Use what from adjoining high rise bldg.’s?

Answer 14

Supply the sprinkler system

Master streams from adjoining bldg.’s