Ch 21 High Rise Building Collapse Flashcards
World Trade Center Building 7 collapsed because of what? Pg 293
Fire destruction
Towers 1 and 2 collapsed because of what? Pg 293
Because of plane impact and jet fuel fires.
What is a progressive collapse? Pg 295
Occurs when an initial load failure spreads from the structural element to structural element, resulting in the collapse of an entire structure.
What is global collapse? Pg 295
Is total collapse
What was the cause of Building 7’s collapse on 9/11? p. 293
Fire destruction
How many floors were burning in Building 7 that caused it to collapse?
p. 293
Ten
On which side of Building 7 could smoke be seen due to the winds?
p. 297
South
What must the fire commander plan for when an uncontrolled high-rise fire happens? p. 294
Global collapse
What fueled the fire in Building 7?
p. 293
Office furnishings
On which side of the roof was the first detectable indicator of the collapse evident? p. 298
Eastern
What caused the sprinklers in Building 7 to malfunction on the lower floors?
p. 295
Collapse of Towers 1 and 2
What is the maximum amount of time high-rise fire-resistive steel frames are protected against heat? p. 300
4 hours
What was the exact cause of Building 7’s collapse? p. 298
Thermal expansion
How long did the flying brands blind everyone each time a building collapsed during the 9/11 attacks?
p. 296
20 minutes
Where were flames first observed in Building 7? p. 297
South east corner of the 22nd floor
What is the required fire protection for a high-rise building? p. 299
Compartmentation and automatic sprinklers
Where did Building 7’s collapse begin?
p. 295
Connections
Which part of the windows in Building 7 broke out first due to exposure to the fire? p. 297
Center
How did the progress of failure at Building 7 move? p. 298
Beam to girder to column
Approximately how much burn time per floor is experienced in a high-rise building fire for the combustibles on the floor to be consumed? p. 300
1 1/2 hours
When was the first time in the history of the fire service where firefighters were withdrawn from a burning high-rise building? p. 299
Meridian Plaza fire
