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[4] PCD > Lesson 3: Behavior of Prestressed Concrete Beams > Flashcards

Lesson 3: Behavior of Prestressed Concrete Beams Flashcards

1
Q

3 types of vibration

A
  • low-intensity vibration
  • moderate-intensity vibration
  • high-intensity vibration
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2
Q

this type of vibration is typically not harmful to humans or structures

A

low-intensity vibration

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3
Q

this type of vibration can cause discomfort and fatigue in humans

A

moderate-intensity vibration

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4
Q

this type of vibration can cause serious injuries to humans

A

high-intensity vibration

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5
Q

4 methods to lessen vibration

A
  • isolating the source of vibration
  • absorbing vibration
  • dampening vibration
  • designing structures to resist vibration
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6
Q

according to this criterion, a material will fail in shear when the shear stress reaches a critical value

A

Mohr-Coulomb failure criterion

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7
Q

it is the ability of a material to resist sudden forces without breaking or deforming

A

impact resistance

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8
Q

4 factors that affect impact resistance

A
  • type of material
  • thickness of the material
  • presence of reinforcement
  • shape of the material
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9
Q

it is the ability of a material to resist forces that tend to cause two parts of the material to slide past each other

A

shear resistance

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10
Q

4 factors that affect shear resistance

A
  • type of material
  • thickness of the material
  • presence of reinforcement
  • angle of the forces
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11
Q

3 advantages of using unbonded steel sections

A
  • reduce the weight of the structure
  • allow for thermal expansion and contraction
  • allow for the use of different materials
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12
Q

3 disadvantages of using unbonded steel sections

A
  • reduced strength and durability
  • increased risk of corrosion
  • increased maintenance requirements
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13
Q

3 types of cracks

A
  • hairline cracks
  • wide cracks
  • delamination
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14
Q

cracks are small, narrow cracks that are typically less than 0.1 mm wide

A

hairline cracks

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15
Q

cracks are more than 0.1 mm wide

A

wide cracks

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16
Q

this crack is the separation of the concrete from the reinforcement

A

delamination

17
Q

4 factors that affect the bond between steel and concrete

A
  • surface profile of the steel reinforcement
  • thickness of the concrete cover
  • quality of the concrete
  • construction practices
18
Q

4 common causes of cracks

A
  • loading
  • shrinkage
  • corrosion of reinforcement
  • defects in the concrete
19
Q

concrete is strong in _____ but weak in _____

A

compression; tension

20
Q

concrete shrinks as it _____

A

dries

21
Q

the steel reinforcement in concrete can corrode if it is exposed to _____ and _____

A

moisture; oxygen

22
Q

5 ways to prevent cracking

A
  • using high-quality concrete
  • properly curing the concrete
  • protecting the concrete from moisture and oxygen
  • using corrosion-resistant reinforcement
  • minimizing defects in the concrete
23
Q

3 techniques to improve durability of reinforced concrete beams

A
  • using high-quality concrete
  • using corrosion-resistant reinforcement
  • protecting the concrete from the environment.
24
Q

3 techniques to control the deformation of reinforced concrete beams

A
  • using high-strength concrete
  • using closely spaced reinforcement
  • using stirrups
25
Q

3 techniques to control the deflection of reinforced concrete beams

A
  • using a deeper beam
  • using a smaller load
  • using prestressing
26
Q

3 things to consider regarding the deformation of reinforced concrete beam

A
  • durability
  • crack control
  • deflection control
27
Q

3 methods of analyzing deformation

A
  • elastic theory of bending
  • plastic theory of bending
  • finite element method
28
Q

this method of analyzing deformation assumes that the concrete and steel in the beam behave elastically

A

elastic theory of bending

29
Q

this method of analyzing deformation assumes that the concrete in the beam behaves plastically after it reaches its yield strength

A

plastic theory of bending

30
Q

this method of analyzing deformation is a more sophisticated method that can account for the non-linear behavior of concrete and steel

A

finite element method

31
Q

four criteria to determine whether a prestressed concrete beam is superior to an ordinary concrete beam

A
  • load-carrying capacity
  • deflection resistance
  • crack control
  • durability
32
Q

true or false:

prestressed concrete beams have a higher load-carrying capacity than ordinary concrete beams

A

true

33
Q

true or false:

prestressed concrete beams have a better deflection resistance than ordinary concrete beams

A

true

34
Q

true or false:

prestressed concrete beams are less likely to crack than ordinary concrete beams

A

true

35
Q

true or false:

prestressed concrete beams are durable and can withstand a variety of environmental conditions

A

true

[4] PCD (4 decks)

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