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EXAC > Part 8 > Flashcards

Part 8 Flashcards

1
Q

What is a one way concrete slab?

A

A one way concrete slab is a type of slab with reinforcement only in one direction, cast integrally w parallel supporting beams

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2
Q

True or False: One way concrete slabs are generally used for short spans.

A

True

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3
Q

What type of loads do one way concrete slabs primarily resist?

A

Bending loads

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4
Q

What is the minimum thickness recommended for one way concrete slabs?

A

100mm
span/30 for floor slabs
span/36 for roof slabs

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5
Q

What is the typical spacing of reinforcement bars in one way concrete slabs?

A

100mm to 200mm

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6
Q

Why are one way concrete slabs not suitable for longer spans?

A

Due to potential deflection issues.

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7
Q

What is the recommended concrete mix for one way concrete slabs?

A

25MPa

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8
Q

What is the main advantage of using one way concrete slabs?

A

They are cost-effective and easy to construct.

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9
Q

What is the maximum span length recommended for one way concrete slabs?

A

6m

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10
Q

True or False: One way concrete slabs can be used in areas with heavy traffic loads.

A

False

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11
Q

What type of reinforcement is commonly used in one way concrete slabs?

A

Steel reinforcement

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12
Q

One way concrete slabs are designed as ____________ slabs.

A

simply supported, on two sides by beams or load bearing walls. Beams can be supported by girders or columns

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13
Q

True or False: One way concrete slabs are suitable for irregularly shaped structures.

A

False

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14
Q

What is the primary disadvantage of one way concrete slabs?

A

Limited span length capabilities.

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15
Q

What is the critical design aspect to consider when designing one way concrete slabs?

A

Reinforcement spacing and arrangement.

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16
Q

True or False: One way concrete slabs are suitable for heavy industrial structures.

A

False

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17
Q

What is the recommended depth of one way concrete slabs for residential construction?

A

100mm

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18
Q

What is a floor system?

A

Horizontal plane supporting live loads (people furnishings, movable equipment) and dead loads (weight of floor construction) - depth related to size and proportion of structural bay span + material strength. Deflection is a critical control factor. Consider mech and elec within the system. Consider sound and FRR.

19
Q

What is the purpose of a vapour barrier in Canada?

A

To prevent moisture from entering the building envelope.

20
Q

True or False: In Canada, vapour barriers are required by the building code.

A

True

21
Q

What type of material is commonly used for vapour barriers in Canada?

A

Polyethylene plastic

22
Q

What is the recommended placement of a vapour barrier in Canada?

A

On the warm side of the insulation

23
Q

Fill in the blank: Vapour barriers in Canada are typically installed on the __________ side of the building envelope.

A

warm

24
Q

What can happen if a vapour barrier is installed on the cold side of the insulation?

A

Moisture can get trapped and cause damage.

25
Q

What is the main function of a vapour barrier in Canada?

A

To control the movement of moisture vapor.

26
Q

What are some consequences of not installing a vapour barrier in Canada?

A

Mold growth, rot, and reduced energy efficiency.

27
Q

Fill in the blank: Vapour barriers are designed to prevent the diffusion of __________ through the building envelope.

A

moisture

28
Q

What are some common locations for installing vapour barriers in Canada?

A

Walls, ceilings, and floors

29
Q

What is the recommended perm rating for a vapour barrier in Canada?

A

Less than 1 perm

30
Q

What is the purpose of a vapour barrier in a Canadian building during the winter?

A

To prevent warm indoor air from condensing on cold surfaces.

31
Q

What are some potential benefits of installing a vapour barrier in a Canadian building?

A

Improved energy efficiency, increased comfort, and reduced risk of moisture damage.

32
Q

Fill in the blank: Vapour barriers are designed to be a __________ barrier to prevent moisture from entering the building envelope.

A

continuous

33
Q

Two way slab and beam

A

Uniform thickness reinforced in 2 directions, cast integrally w supporting beams and columns on all 4 sides (square ish bays = most efficient). Reinforcement in column and middle strips. Subject to lower bending moments than simply supported slabs.

34
Q

Two way waffle slab

A

2 way concrete reinforced by ribs in 2 directions - able to carry heavier loads and longer spans. At column heads, solid squares are used for additional shear strength and momentum resisting capacity. Can be cantilevered 1/3 of the main span.

35
Q

Two way flat plate

A

Uniform thickness over columns without beams - good for apartment or hotel construction. Shear at column locations governs thickness of flat plate. Shear at column main consideration.

36
Q

Two way flat plate

A

Uniform thickness over columns without beams - good for apartment or hotel construction. Shear at column locations governs thickness of flat plate. Shear at column main consideration.

37
Q

Two way flat slab

A

Flat plate thickened at column supports to increase shear strength and moment resisting capacity. Can support relatively heavy loads and spans from 6-12m

38
Q

Pretensioning

A

Stretched reinforced tendons into concrete casting - tensile tension causes slight upward curvature or camber - deflection of member under loading tends to equalize the curvature

39
Q

Tensioning reinforcing tendons after concrete has set

A

Post tensioning

40
Q

What is the span range for a 2x6

A

Up to 10’ (3050mm)

41
Q

Span range for a 2x8

A

8-12’ (2440-3660”

42
Q

Span range for 2x10

A

10-14’ (3050 - 4264mm)

43
Q

Span range for 2x12

A

12-18’ (3660-5485)

44
Q

True or false: stiffness of joist framing under stress is more important than strength

A

True - deeper joists spaced farther apart are more desirable for stiffness than shallow joists spaced close together

EXAC (3 decks)

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