Chap 10 Light weight Steel Roof Collapse

Question 0

For spray on fire retarding material to be effective there are 3 necessary criteria

Answer 0

Adhesion
Consistency
Thickness

Question 1

3 methods of protecting steel from fire in construction

Answer 1

Concrete encasement-best method

Membrane ceiling - not as effective as concrete spray on fire retarding material - least effective

Question 2

According to Dunn four factors will determine the speed with which unprotected steel will Fail during fire

Answer 2

The temp of fire
The load stress
The steel thickness
The size of the fire

Question 3

The fire service considers 1100 degrees to be the failure temp of steel at this temp steel will lose _____ percent of load carrying capacity

Answer 3

40 percent of load capacity ( this is temp within steel itself )

Question 4

For a 50 foot long steel beam that is heated uniformly over its length from 72 degrees to 972 degrees

Answer 4

The average increase in length can be 3 feet 9 inches