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BC > Chapter 9 > Flashcards

Chapter 9 Flashcards

1
Q

Primary two metal alloyed in steel are

A

Iron

Carbon

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2
Q

The 4 Basic properties of steel includes

A

Strongest of the common building materials

Non Rotting resistant to aging and dimensionally stable

Consisten quality from controlled industrial manufacturing process

relatively expensive but strength and other qualities enable it to be used in smaller quantities that other materials

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3
Q

One disadvantage of steel

A

Is the tendency to rust

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4
Q

3 ways to protect steel from rusting are

A

Painting the surface with a rust inhibiting paint

Coating the matererial with since or aluminum

Adding alloy elements that resist rust

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5
Q

3 elements added to increase attributes

A

Molybdenum -Strength

Vanadium- Strength and toughness

Manganese- Resistance of steel to abrasion

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6
Q

Rolling process consist of

A

Repeatedly passing ingots of steel heated to 2,200f between large rollers untill the intended shape is achieved

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7
Q

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

A

Cold Rolled Steel (CRS)

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8
Q

Cold rolled steel CRS is used for

A

IS used for member that have a thin cross section such as floor and roof decking and wall studs

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9
Q

Unrestrained steel beam 20 feet can expand

A

1.4 inches

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10
Q

Characteristic most significant to the fire service in steel is

A

The deterioration of steel strength at elevated temperatures

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11
Q

Temperatures hot enough to weaken steel to its yield point

A

1,200 f

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12
Q

A steel column in encased in 3 inches of concrete with a siliceous aggregate would have a fire resistance of

A

4 hours

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13
Q

Sprayed applied fire resistive materials SFRM two most common used are

A

Mineral fiber

Expanded aggregate coatings such as vermiculite and perlite

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14
Q

The applied fire proofing can vary from 7/8 to 1-7/8 to give a rating of

A

1-4 hours

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15
Q

High density SFRMS that use magnesium oxchoride have densities ranging form

A

40 to 80 lb/ft

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16
Q

Cementious materials ingredients (4)

A

Portland cement

Gypsum

Perlite

Vermiculite

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17
Q

Gypsum board is available in two types

A

Regular

and type X

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18
Q

A board that contains additives to increase its fire resistance and is usually required where specified fire resistance is desired is

A

Type x Gypsum board

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19
Q

Intumescent coating will expand

A

15 to 30 times its original volume

20
Q

Intumescent coating are applied as ____ and have a thickness of

A

Paint

0.03 to 0.4

21
Q

3 Advantages included for intumescent coatings

A

lighter weight

durable surfaces

good adhesion

22
Q

the most common method is to use membrane ceiling is

A

to use mineral tiles in a steel framework suspended by wires

23
Q

The use of membrane ceiling can proved a fire rating of

A

1-3 hours

24
Q

two important reasons for the design of the connections in steel frame buildings is

A

the connection of a beam to a column transfers the loads between members

connections determine the rigidity of the basic structure

25
Q

the connections between the beams and columns in rigid frame system are to

A

resist the bending forces

26
Q

the joints in a simple frame are designed to primarily

A

support a vertical force

27
Q

the connections in a semi rigid frame are not completely rigid but possess enough rigidity to provide

A

diagonal support to the structure

28
Q

3 dimensional space frame open web joist is also know as

A

Delta trusses

29
Q

Two commonly encountered application of basic steel truss are

A

Joist girder

Open web joist

30
Q

Open web joist are mass produced and are available with depths of up to

A

6 feet and span up to 144 feet

31
Q

More frequently found open web joist depths are

A

Less than 2 feet and spans up to 40 feet

32
Q

The top of a ridged Frame is call the

A

Crown

33
Q

The points where the inclined member intersection the vertical member are known as

A

Knees

34
Q

Crown and knee are designed as rigid joints so

A

no rotation between members can happen

35
Q

Gable roof rigid frame structure must be braced

A

Diagonally for structural rigidity

36
Q

3 most common colum cross section are

A

Hollow cylinder

Rectangular tube

Wide Flange shape similar to cross section of an I beam

37
Q

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 rations indicate higher are more stable

A

Slenderness ratio

38
Q

In general columns used for structural support in building should

A

Not have a slenderness ratio greater then 120

39
Q

Columns that are erected so they cannot rotate at their end have

A

Fewer tendencies to buckle then those that are free to rotate

40
Q

Steel arches can be constructed to span distances

A

Greater then 300 feet

41
Q

Steel joist are produced with depth of

A

6 to 12 inches

42
Q

Steel joist can be spaced

A

16 to 48 inches apart

43
Q

Fire resistance rating may be eliminated for roof construction when

A

Located more then 20 feet above the floor or have automatic sprinkler system

44
Q

Three connection types to increase the mass at the point of connect too make it the item to fail within a structural system are

A

Ridge connections

Gusset plate

Knee joints

45
Q

The primary purpose of a _______ is to strengthen the connection and increase the steel mass at the connection decreasing the possibility of failure

A

Gusset plate

46
Q

Knees joints are

A

The strongest part of the frame and last part to fail

47
Q

Knee joints help

A

Transfer the roof load to the vertical members

BC (10 decks)

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