Chapter 9 Steel Construction

Question 1

Steel beams and trusses have largely replaced __________ in commercial structures

Answer 1

Wood beams and trusses

Question 2

Steel framing is used in both types of buildings

Answer 2

Fire-resistive

Non fire resistive

Question 3

The primary two metals alloyed in steel is

Answer 3

Iron and carbon

Question 4

Structural steel has less than what percent of carbon

Answer 4

Less than three tenths of one percent

Question 5

Cast iron has a higher carbon content of

Answer 5

3 to 4%

Question 6

Higher carbon content in cast iron makes it

Answer 6

Hard but brittle

Question 7

One disadvantage of steel is the tendency to _______ when exposed to air and moisture

Answer 7

Rust

Question 8

Molybdenum

Answer 8

Strength

Question 9

Vanadium

Answer 9

Strength and toughness

Question 10

Manganese

Answer 10

Resistance of steel to abrasion

Question 11

Substance or mixture composed of two or more metals

Answer 11

Alloy

Question 12

An alloy of iron and Carbon

Answer 12

Steel

Question 13

The lower carbon content of steel compared to cast iron results in a material That is

Answer 13

Ductile rather than brittle

Question 14

Ductility of steel also allows it to be shaped by

Answer 14

Rolling as opposed to molding

Question 15

Repeated passing ingots of steel heated to 2,200 degrees between large rollers until intended shape is achieved

Answer 15

The rolling process

Question 16

One common structural steel is

Answer 16

ASTM A36 includes manganese carbon and silicon

Question 17

The stress exerted on steel against the resulting deformation known as

Answer 17

Strain

Question 18

Yield point stress is reached

Answer 18

Approx 36,000 psi

Question 19

Steel undergoes pronounced deformation finally the steel breaks at the

Answer 19

Ultimate stress

Question 20

Steel alloys with higher yield points have less

Answer 20

Ductility

Question 21

Cold rolling occurs at temperatures above

Answer 21

Recrystallization temperature

Question 22

Steel expands as it is

Answer 22

Heated

Question 23

The amount of expansion for slender members such as beams and columns can be determined can be determined through a property known as

Answer 23

Linear coefficient of thermal expansion

Question 24

Steel is a good conductor of heat because it’s a heavy material having a density of around

Answer 24

490 pounds per cubic feet

Question 25

Bar joist or slender trusses can be expected to fail early when exposed to an

Answer 25

Intense enough fire

Question 26

Steel structural members that are not protected against exposure to heat

Answer 26

Unprotected steel

Question 27

Fire can create temps in excess of 1200 degrees witch is hot enough to Weaken steel to its

Answer 27

Yield point

Question 28

Yielding and thermal expansion take place

Answer 28

Simultaneously

Question 29

Theoretical minimum amount required to raise the temp of the beam to

Answer 29

1,000 degrees

Question 30

The usual way to protect steel from the heat of a fire is to add an

Answer 30

Insulation material

Question 31

Fireproofing on steel beams can vary from __________ and to produce a fire resistive rating of ________

Answer 31

7/8 - 1 7/8 inches 1-4 hours

Question 32

Low density fiber materials are not suitable for

Answer 32

Exterior use

Question 33

Cementitious materials have densities ranging from

Answer 33

15-50 lb ft

Question 34

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

Answer 34

Calcined

Question 35

Process of driving free and chemically bound water out of gypsum

Answer 35

Calcination

Question 36

Gypsum board is available as

Answer 36

Regular or type X

Question 37

Regular gypsum board has no special

Answer 37

Additives to enhance its fire resistance

Question 38

Type X gypsum board contains additives to

Answer 38

Increase its fire resistance

Question 39

Gypsum includes _________ entrapped water

Answer 39

Approx 20 %

Question 40

Gypsum can be used to protect both _________ and ________ providing rating from 1-4 hours, gypsum board is used in multiple layers to Syrian higher fire resistance ratings

Answer 40

Column and beams

Question 41

Intumescent coating will char, foam , and expand ________ its original volume

Answer 41

15-30 times it’s original weight

Question 42

Intumescent coatings are applied as paint in thicknesses of

Answer 42

0.03 to 0.4 inches

Question 43

A commonly used method of protecting a steel floor or roof assembly is

Answer 43

Membrane ceiling

Question 44

______ panels are also used for membrane ceilings

Answer 44

Gypsum

Question 45

Membrane ceiling can provide a fire rating

Answer 45

1-3 hours

Question 46

The basic method by which steel is used in the design of building is the construction of

Answer 46

Structural framework that supports the floors , roof , and exterior walls

Question 47

The connection of a beam to a column transfers the

Answer 47

Loads between members

Question 48

Connections determine the ______ of the basic structure

Answer 48

Rigidity

Question 49

Beam and girder steel frames can be classified as

Answer 49

Rigid , simple, semi rigid

Question 50

Beams and columns in steel frame buildings are connected by

Answer 50

Bolting and welding , Riveting was used in the first half of the 20th century

Question 51

Connections between the beams and columns in a ___________ system are designed to resist the bending forces resulting from the supported loads and lateral forces

Answer 51

Rigid frame system

Question 52

The joints in a ________ are designed to primarily to support a vertical force

Answer 52

Simple frame system

Question 53

The connections of ___________ are not completely rigid but posses enough rigidity to provide some diagonal support to the structure

Answer 53

Semi rigid frame

Question 54

_________ trusses provide a structural member that can carry loads across greater spans than beams can

Answer 54

Steel

Question 55

Steel trusses are frequently used in three dimensional space frames know as

Answer 55

Delta trusses , because the cross section resemble the Greek letter delta

Question 56

Two commonly encounter applications of the basic steel truss are

Answer 56

Joist girder Open web joist

Question 57

Joist girder are _________ used to take the place of steel beams as part of the primary structural frame

Answer 57

Heavy steel trusses

Question 58

Open web trusses are massed produced and available in depths of _________ and span up to _______

Answer 58

6 ft 144 ft Most often found depths less than 2 ft and spans of 40 ft

Question 59

Open web truss is know as

Answer 59

Bar joist