Ch. 17 High-Rise Office Bldgs Flashcards Preview

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Flashcards in Ch. 17 High-Rise Office Bldgs Deck (71)
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1

Bldg codes require bldgs (this high) have construction/fire protection features that are hallmarks of high-rise bldgs

Taller than 6 stories

2

Occupants should know following actions: (taapo)

Transmit alarm.
Alert others.
Avoid elevators.
Prevent smoke entering rooms.
Obtain fresh air

3

Any building exceeding _____________ must be ACCORDED same strategies as used in tall high-rises

Length of available ladders

3

Chain of fire safety (3)

Architects.
Fire and bldg departments.
Buildings occupants

5

Weak link in chain of fire safety

Building's occupants

5

High rise strategic plan: (5)

Determine specific floor.
Verify location before committing handlines.
Begin controlled evacuation.
Gain control of buildings systems.
Confine and extinguish fire.

6

Designs of high rise fall into 2 eras:

Pre-World War II.
Built afterward

7

Evacuation in Class I high rises usually means:

Fire floor and floor above initially

8

Euler's law column

Columns unsupported at their sides can carry only a FRACTION of the weight they can carry when attached at regular intervals

9

Medium weight office building:

-steel girders and columns, NOT trusses.
-protected by spray-on fireproofing

10

Prewar era also saw strong concerns for:

Life safety-numerous means of egress, usually remote from each other

11

Pre war bldgs were: (5)

Overbuilt.
General theme was reinforce everything.
Steel beam encased in concrete.
More compartmentation.
No hung ceilings.
Fewer electrical and electronic items.

12

Prewar high rises, stairways located in:

Fire towers, enclosed in 4-hr fire wall-landings open to outside air

13

In modern high-rise construction, WORST type of stairs:

Scissor staircases-intertwine with each other, separated by gypsum wall

14

No central air-conditioning means: (3)

No Ducts to move smoke.
Absence of ducts mans fewer places for hidden fire.
Windows open for horizontal ventilation.

15

Most important prewar building feature regarding fire spread:

Absence in central air-conditioning systems that serve more than one floor

16

High-rise office bldg fire require special tactics such as: (3)

1 hr scba.
2 1/2 in. hose.
Solid tip nozzles

17

Disadvantages of newer style high-rises: (5)

Lightweight bldg materials.
Curtain wall constr.
Wide-open floor spaces.
Hung ceilings.
Core construction

18

Key items to determine strategy: (3)

Type of constr (heavy, med, light).
Trusses in fire area.
What type of fireproofing applied

19

Fires in modern high-rise, the threat of collapse is remote. The greatest threat to life:

Unable to perform rapid effective ventilation

20

HVAC to direct smoke out of bldg:

Subject to many problems.
Extremely complex operation.
Shut it down.

21

Prewar high-rises had other features as well that aided fire safety and control: (3)

More compartmentation.
No hung ceilings/blind spaces.
Fewer electrical and electronic items to act as sources of ignition

22

Steps to remove smoke and heat
Options are:

Vertical ventilation up stairways.
Horizontal ventilation out windows.
Ventilation by means of HVAC/smoke-control systems

24

Two factors outweigh all others in high-rise ventilation:

Wind and Stack Effect

24

Opening the top of a building is the _________ to understand but often _________ to accomplish.

Easiest.
Very difficult.

25

Deciding to use HVAC, IC must know: (5)

Exact location.
Floor layout, stairs, air shafts/outlets.
Location of FF/civilians.
Fire conditions.
Endanger FF or civilians by drawing fire toward them

26

Stack effect noticeable in bldgs:

MORE than 60 feet high
-STRONGER as it gets TALLER.

27

Answer to mushrooming:

Provide a vent over stairway allowing heated air to escape

28

Using elevator shafts as vent point NOT RECOMMENDED: (4)

Hoistway door opened; elevator out of service.
Hoistway door opened; FFs fall into shaft.
Hoistway opening at top small; 2-4 sq. ft.
Hoistway doors above fire will allow heat/smoke to floors.

29

Two unusual phenomenon in high-rises:

Stratification of smoke below top floors (layers or clouds in the bldg).
-temp not enough to rise to top (PPV in stair shafts).
Inverse (reverse) stack effect (smoke at bottom).
-air conditioned bldg in hot weather