Chapter 9

Question 1

Alloy

Answer 1

Substance or mixture composed of two or more metals (or a metal and nonmetallic elements) fused to and dissolved into each other to enhance the properties or usefulness of the base metal.

Question 2

Steel

Answer 2

An alloy of iron and carbon; proportions and additional elements affect the characteristics of the finished material. Used widely in the construction of buildings and other infrastructure.

Question 3

Ductility

Answer 3

A measure of a metal’s ability to be drawn, hammered thin, or rolled into shapes without breaking. The high ductility of steel makes it very versatile for use in constructing buildings.

Question 4

Rolling

Answer 4

Process of forming metal stock into shapes including sheets by passing thick bars of metal through a pair of rollers. Cold rolling occurs at temperatures above recrystallization temperature.

Question 5

Cold Rolled Steel (CRS)

Answer 5

Commercial and drawing steels; shaped after cooling below its recrystallization temperature by being passed through a series of rollers to reduce the thickness incrementally.

Question 6

Unprotected Steel

Answer 6

Steel structural members that are not protected against exposure to heat.

Question 7

Spray-Applied Fire Resistive Material (SRFM)

Answer 7

Coating used to increase the fire resistance rating of structural components. Materials commonly include mineral fiber or aggregates such as vermiculite and perlite.

Question 8

Calcined

Answer 8

Process that heats a substance to a high temperature but below the melting or fusing point, causing loss of moisture, reduction or oxidation, and decomposition of carbonates and other compounds.

Question 9

Calcination

Answer 9

Process of driving free and chemically bound water our of gypsum; also describes chemical and physical changes to the gypsum component itself.

Question 10

Membrane Ceiling

Answer 10

Usually refers to a suspended, insulating ceiling tile system.

Question 11

Slenderness Ratio

Answer 11

Comparison of the height or length of a structural component and the width/thickness of the component. Used to determine the load that can be supported by the component; lower ratios indicate higher are more stable.

Question 12

Corrugated

Answer 12

Formed into ridges or grooves; serrated.

Question 13

Molybdenum

Answer 13

Strength

Question 14

Vanadium

Answer 14

Strength and toughness

Question 15

Manganese

Answer 15

Resistance of steel to abrasion

Question 16

Cold rolled steel is used for

Answer 16

Members that have a thin cross section, such as floor and roof decking and wall studs

Question 17

One common structural steel is

Answer 17

ASTM A36 which includes manganese
Carbon
Silicon

Question 18

The deterioration of steel strength at elevated temperatures is

Answer 18

The characteristic most significant to the fire service

Question 19

The speed of steel failure depends on several factors including

Answer 19

Type of steel
Mass of steel members
Load supported by the steel
Type of connections used to join the steel members 
Intensity of exposing fire

Question 20

Unprotected steel structures members with less mass require less heat to

Answer 20

Reach the failure temperature

Question 21

Yielding and thermal expansion take place simultaneously however, the

Answer 21

Tendency for steel to yield and therefore to bend or Buckle is the more significant concern in most fire situations

Question 22

The load that steel members are supporting affect the

Answer 22

Behavior of steel because the loads produce the stresses and steel

Question 23

The loss of steel strength because of increased temperature is often

Answer 23

Not a sudden occurrence rather the steel loses its strength gradually as its temperature increases

Question 24

The fire would have to generate a large amount of

Answer 24

Heat above theoretical minimum amount required to raise the temperature of the beam to 1000f(540c)

Question 25

Bar joists are frequently used

Answer 25

In closely spaced configuration for support of floors or roof decks.