Ch 21 High Rise Building Collapse

Question 1

World Trade Center Building 7 collapsed because of what? Pg 293

Answer 1

Fire destruction

Question 2

Towers 1 and 2 collapsed because of what? Pg 293

Answer 2

Because of plane impact and jet fuel fires.

Question 3

What is a progressive collapse? Pg 295

Answer 3

Occurs when an initial load failure spreads from the structural element to structural element, resulting in the collapse of an entire structure.

Question 4

What is global collapse? Pg 295

Answer 4

Is total collapse

Question 5

What was the cause of Building 7’s collapse on 9/11? p. 293

Answer 5

Fire destruction

Question 6

How many floors were burning in Building 7 that caused it to collapse?
p. 293

Answer 6

Ten

Question 7

On which side of Building 7 could smoke be seen due to the winds?
p. 297

Answer 7

South

Question 8

What must the fire commander plan for when an uncontrolled high-rise fire happens? p. 294

Answer 8

Global collapse

Question 9

What fueled the fire in Building 7?
p. 293

Answer 9

Office furnishings

Question 10

On which side of the roof was the first detectable indicator of the collapse evident? p. 298

Answer 10

Eastern

Question 11

What caused the sprinklers in Building 7 to malfunction on the lower floors?
p. 295

Answer 11

Collapse of Towers 1 and 2

Question 12

What is the maximum amount of time high-rise fire-resistive steel frames are protected against heat? p. 300

Answer 12

4 hours

Question 13

What was the exact cause of Building 7’s collapse? p. 298

Answer 13

Thermal expansion

Question 14

How long did the flying brands blind everyone each time a building collapsed during the 9/11 attacks?
p. 296

Answer 14

20 minutes

Question 15

Where were flames first observed in Building 7? p. 297

Answer 15

South east corner of the 22nd floor

Question 16

What is the required fire protection for a high-rise building? p. 299

Answer 16

Compartmentation and automatic sprinklers

Question 17

Where did Building 7’s collapse begin?
p. 295

Answer 17

Connections

Question 18

Which part of the windows in Building 7 broke out first due to exposure to the fire? p. 297

Answer 18

Center

Question 19

How did the progress of failure at Building 7 move? p. 298

Answer 19

Beam to girder to column

Question 20

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

Answer 20

1 1/2 hours

Question 21

When was the first time in the history of the fire service where firefighters were withdrawn from a burning high-rise building? p. 299

Answer 21

Meridian Plaza fire