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Handbook Of Tactics > Ch 22 Structural Collapse > Flashcards

Ch 22 Structural Collapse Flashcards

1
Q

Buildings that show the greatest resistance to collapse are what? Pg 544

A

Class 1 fireproof construction. Those buildings have fire resistance ratings of up to 4 hours.

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2
Q

Second best construction type, as far as resistance to collapse is concerned is what? Pg 545

A

Heavy timber. These buildings are generally quite stable due to the size of their load bearing members, which are generally 12x12 wooden columns and brick walls.

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3
Q

The collapse danger zone should be at least what? Pg 545

A

1 1/2 times the height of the wall

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4
Q

The third most collapse resistant building is that of what? Pg 546

A

Class 3 ordinary construction

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5
Q

The fourth category in order of resistance to collapse is what? Pg 546

A

Class 5

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6
Q

Which class construction is the least resistant to collapse? Pg 547

A

Class 2

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7
Q

A 100 foot long I-beam heated uniformly to how many degrees and will expand to how many inches? Pg 547

A

1000 degrees and 9 1/2 inches lengthwise.

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8
Q

Those with protected steel or concrete supporting system resist total collapse rather well this is called what? Pg 547

A

Framed structures, since most of their weight is carried in the Frame skeleton.

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9
Q

Building that is built so that most of the weight rests on bearing wall and consist of wood frame, brick and joist, heavy timber are called what? Pg 547

A

Unframed buildings

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10
Q

The hierarchy of structural components is as follows, ranging from most important to least important? Pg 548

A
  1. Bearing Walls
  2. Columns
  3. Girders (which support beams)
  4. Beams and joists
  5. Floor or roof decking
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11
Q

Wooden structural elements burn through at a rate of what? Pg 549

A

1 inch for every 45 minutes of open burning time

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12
Q

Lightweight steel bar joist can lose their strength is as little as how many minutes of fire exposure? Pg 549

A

5-10 minutes

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13
Q

A 1,000 gpm master stream adds approximately how many lbs to the building each minute? Pg 551

A

8500 lbs

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14
Q

There are five generally recognized types of collapse? Pg 559

A
  1. V-shape
  2. A-frame
  3. Supported lean-to
  4. Unsupported lean to, also called cantilever.
  5. Pancake
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15
Q

V-shaped collapses usually occur in what class buildings having wooden floor joist when these joists at either overloaded, have a center support removed, or are burned away under load? Pg 559

A

Class 3 or 5

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16
Q

What type of collapse results when a strong center object hold up the center portion of a structure, while the outer ends of floors or roof fall, resulting in a tent like structure in the center of the debris pile? Pg 560

A

A-frame

17
Q

Which collapse results from the failure of the support at one end of a floor or roof? Pg 560

A

Supported lean to collapse

18
Q

Which collapse result from similar events that cause the supported lean to, but the floor or roof joist end up dangling in midair, held only by their attachment at the remaining standing wall? Pg 560

A

Unsupported lean to

19
Q

What type of collapse are often the deadliest, since the floors tend to fall nearly straight down, stacking up like a stack of pancakes? Pg 561

A

Pancake

20
Q

Result from spaces formed by a series of strong objects that prevent collapse into that particular area and may be found in any type of collapse? Pg 562

A

Individual voids

21
Q

The five stages of the collapse rescue plan are as follows? Pg 564

A
  1. Reconnaissance and size up
  2. Accounting for and removal of the surface victims.
  3. Searching voids
  4. Selected debris removal and tunneling.
  5. General debris removal
22
Q

You should only begin to remove what after you have completed the first four stages and removed all victims that can be located using those procedures, have conducted a thorough search using search dogs or acoustic and seismic devices, and are certain that there are no other survivors? Pg 568

A

General debris

23
Q

What should the minimum collapse zone be established at when there is a bowstring truss roof with hip rafters
resting on the ends of the truss?
p. 558

A

2 1/2-times the height of the wall

24
Q

What is the first step that should be taken when a collapse has occurred and there are trapped victims? p. 564

A

Reconnaissance and size-up

25
Q

Where does most of the weight of the building rest in an unframed building?
p. 547

A

Bearing walls

26
Q

What is the first priority for the first-alarm engine companies? Pg 569

A

Fire burning in the rubble pile

27
Q

How much does a masonry wall weigh per cubic foot? p. 556

A

80-130 pounds

28
Q

What is considered the second best construction type as far as resistance to collapse is concerned? p. 545

A

Class 4

29
Q

Which is the second most serious possible warning sign of collapse?

A

Truss construction

30
Q

What is the usual way to initiate a withdrawal from the building? p. 555

A

Portable radio

31
Q

What is the minimum distance in every direction from the operations that crowds should be kept away when using a seismic or acoustic device to locate trapped victims after
a collapse? p. 568

A

One block

32
Q

In what time span do wooden structural members tend to burn through 1 inch? p. 549

A

45 minutes

33
Q

Which direction does the top of the wall often fall when a wall collapses?
p. 557

A

Outward

34
Q

Which level of the pancake collapse should be inspected to determine if the load is being safely transferred to the ground? p. 561

A

Lowest level

35
Q

Which would be a better choice if you must cut a piece of flooring in an unstable building? p. 562

A

Circular saw

36
Q

What minimum number of members on the search team should be an EMT when searching for a trapped firefighter after a collapse?
p. 563

A

One

37
Q

What should be deployed so that once the trapped firefighter has been located a back-up team can come to
the location? p. 563

A

Search rope

Handbook Of Tactics (22 decks)

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