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PDD > MATERIALS - METAL > Flashcards

MATERIALS - METAL Flashcards

1
Q

11 metals in order of Galvanic series, in the presence of sea water from worst to best

A

Zinc

Aluminum

Steel,

Iron

304 Stainless Steel (Active)

Copper,Bronze,Brass

Tin

Lead

316 Stainless Steel (Active)

Titanium

304 Stainless Steel (Passive)

Gold

zippers allure strangers ironically to 304 active strangers,

Cops timidly Lead 316 active strangers with Tits to 304 passive strangers in gold.

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2
Q

Coefficient of expansion – Wood

A

2.5

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3
Q

Coefficient of expansion – Glass

A

5

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4
Q

Coefficient of expansion – Concretes

A

5.5

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5
Q

Coefficient of expansion – Structural steel

A

6.5

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6
Q

Coefficient of expansion – Bronze, Brass

A

10

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7
Q

Coefficient of expansion – Aluminum

A

13

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8
Q

Coefficient of expansion – Lead

A

16

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9
Q

Ferrous metals

A

Contain a substantial amount of iron. In construction industry include wrought and cast iron, steel, stainless steel, and other special steel alloys.

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10
Q

NonFerrous metals:

A

Do Not Contain Iron. Aluminum Copper And Copper Alloys - Brass, Bronze Zinc Lead

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11
Q

Open web steel joist K-Series

A

K-Series - Standard - Span Limits 8 - 60 Feet

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12
Q

steel shapes: L-shapes

A

Structural Steel Angles produced with both equal and unequal leg lengths

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13
Q

steel shapes: (HSS)

A

Structural Steel Tubing, Hollow structural section (HSS) refers to high-strength welded steel tubing

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14
Q

steel shapes: I-beams

A

two different styles, one has a parallel flange surface (W -wide), whereas the other one has a slope on the inner flange surfaces (S-beam).

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15
Q

steel shapes: T-beams

A

WT or ST T-beams have a T-shape, like the universal beam but without a bottom flange. T-beams are best for reinforcement, as they do not resist bending or bear equal weight as well as the I-beam.

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16
Q

steel shapes: H-piles

A

H-piles have the same I-shape but are often placed in the ground to provide deep foundation support for superstructures.

17
Q

steel shapes: C-channels

A

Structural channels are a hot-rolled product with a C-shaped cross-section with various construction and manufacturing applications.

18
Q

Open web steel joist LH Series

A

Lh Series - Long Span – Span Limit 25 - 96 Feet

19
Q

Open web steel joist DLH Series

A

Dlh Series - Deep Long Span- Span Limit Is 90 - 144 Feet,

20
Q

Hard steel

A

Hard steel is a high-carbon steel with increased strength and hardness, but it does not have increased resistance to weathering.

21
Q

Mild steel

A

Mild steel is a low-carbon steel that does not have additional resistance to weathering.

22
Q

Weathering steel

A

Weathering steel is a high-strength, low-alloy steel that forms an oxide coating when exposed to rain or moisture from the atmosphere. Its oxide coating adheres firmly to the base metal and protects it from further corrosion.

23
Q

Tungsten steel

A

Tungsten steel is an alloy steel containing tungsten for increased hardness and heat retention at high temperatures. It does not have additional resistance to weathering.

24
Q

Annealing

A

Annealing - process in which Metal is reheated and slowly cooled to obtain more ductile Metal, which will have improved it’s machinability and cold-forming characteristics

25
Q

Quenching

A

Quenching – heating metal (most often steel) to certain temperature then rapidly cooling by completely submerging in water to strengthen steel.

26
Q

Tempering

A

Tempering – similar to quenching but does not involve rapid cooling. Used to improve strength and workability of steel.

27
Q

An Architect is designing a roof drip edge detail at the top of a masonry wall. Which of the following materials should not be selected for the drip edge?

Galvanized steel

Copper

PVC

Aluminum

A

Aluminum will corrode in the presence of hydroxyl ions that are typically found in concrete and masonry mortar.

28
Q

• Bessemer Process:

A

• Bessemer Process: steelmaking procedure where carbon, silicon, and other impurities are removed from iron to make steel.

29
Q

Galvanizing:

A

Galvanizing: coating iron or steel with a protective layer of zinc by immersing it in a molten bath.

Purpose of Galvanizing: When metal is going to be used in an environment where corrosion is likely, it is often galvanized so that it will be able to withstand the conditions.

Galvanic Corrosion: an electrochemical process where one metal corrodes preferentially to another when they both are in electrical contact and immersed in an electrolyte (which is a liquid or gel that contains ions and can be decomposed by electrolysis)

30
Q

ASTM A36

A

Mild structural steel is known as ASTM A36 and used to be the primary type of steel

used for structural purposes

31
Q

Rivets:

A

Rivets: steel fasteners consisting of a cylindrical body and formed head that is brought to a a high heat inserted through holes matched in members to be joined and then worked with a special hammer to make another head on the other side.

  • As it cools is shrinks and clamps the jointed pieces together
  • Was originally the most used technique, but is very labor intensive compared to bolting and welding
32
Q

2 types of Bolts:

A

Common bolts: easy to find in hardware stores, and installed for less than high-strength bolts. Used in joints where lower strength is sufficient enough to carry the load

• Act primarily in bearing and shear

High Strength Bolts: heat treated during manufacture to develop necessary strength

Can get connecting ability from sheer resistance or from being tightened to the point hat the members they join are kept from slipping by the friction between them (know as slip critical connections)

Inserted into holes slightly larger than the diameter of the bolt

Washers may or may not be required, depending on if load needs to be bread

over a larger area

Tightened with an electric wrench to 70% of its ultimate tensile strength if used

to connection by friction

Hard to verify if necessary tension has been met

33
Q
A
34
Q
A
35
Q
A
36
Q
A

PDD (20 decks)

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