CHAPTER 10

Question 1

The causes of failure in unprotected steel

Answer 1

1) Temperature of fire
2) Load stress of steel
3) Thickness of steel
4) Fire size

Question 2

The failure temperature of steel

Answer 2

1100 Degrees

Will lose 40% of its load carrying capacity

Question 3

Hazards of lightweight steel bar joists

Answer 3

2 main reasons

1) Joist spacing
2) Failure characteristics of unprotected steel

Question 4

Lightweight open web steel joists are spaced

Answer 4

Greater distances apart than standard wood joists

Question 5

Spacing of the open web bar joists vary depending on

Answer 5

Strength of joists

Type of roof decking used

Question 6

The most common decking over open web bar joists is

Answer 6

Corrugated steel. With this type of decking the joists are spaced from 4-6 feet apart
Do not cut this roof
Can remove skylights and scuttles

Question 7

The FDNY has prohibited the use of open web steel joists in nin-residential high rise buildings until

Answer 7

Appropriate fireproofing standards are developed

Question 8

For a 50 foot long steel beam that is heated uniformly over its length form 72 degrees to 972 degrees the average increase in length can be

Answer 8

3 feet 9 inches