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PCE 3 > SEMI FINALS > Flashcards

SEMI FINALS Flashcards

1
Q

Most of the codes provide for the loss of stress due to relaxation of steel as a percentage of initial stress in steel.

A

Loss due to relaxation of stress in steel

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2
Q

Values varying from 0 to 90MPa for stress in wires varying from ____ to ___

A

0.5fpu to 0.8fpu

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3
Q

Characteristic strength of prestressing tendon

A

fpu

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4
Q

Is the loss of stress in steel under nearly constant strain at constant temperature

A

Relaxation

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5
Q

Depends upon the tendon form of alignment, which generally follows a curved profile along the length of the beam

A

Loss due to curvature effect

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6
Q

Depends upon the local deviations in the alignment of the cable

A

Loss of stress due to wobble effect

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7
Q

Is the result of accidental or unavoidable misalignment, since duck or sheaths cannot be perfectly located to follow a predetermined profile throughout the length of beam

A

Wobble or wave effect

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8
Q

The prestressing force at the jacking end

A

Po

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9
Q

Coefficient of friction between the cable and duct.

A

μ

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10
Q

Friction coefficient for wave effect

A

k

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11
Q

The IS Code recommend for the value of k per 100m for normal condition

A

0.15

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12
Q

The IS Code recommend for the value of k per 100m for thin walled ducts where heavy vibrations are encountered and in alter adverse conditions

A

1.5

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13
Q

In prestress, the combined effect of prestressing force and external load can be resolved into a

A

single force

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14
Q

The locus of the points of application of this force in any structure is termed as

A

Pressure Line

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15
Q

The load in pressure line is such that stress at the top fiber of support and bottom fiber of central span is

A

Zero

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16
Q

Refers to the evaluation of permissible prestress, stresses under service load, ultimate strength, and entire load, similar to axial load

A

Analysis of members under flexure

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17
Q

Based on allowable stresses at transfer

A

Permissible prestress

18
Q

These are compared with allowable stresses under service conditions

A

Stresses under service loads

19
Q

This is compared with the demand under factored loads

A

Ultimate Strength

20
Q

The entire load versus ____ behavior

A

deformation

21
Q

Assumption
Concrete is a ______ material

A

homogeneous elastic material

22
Q

Assumption
Within the range of working stress, both concrete and stell behave elastically withstanding the small amount of creep, which occurs in both the materials under the

A

sustained loading

23
Q

Assumption
A plane section before bending is assumed to remain plane even after bending, which implies a ______ across the depth of the member

A

linear strain distribution

24
Q

Assumption
Prestress concrete is one in which there have been introduced internal stresses of such _______ that stresses resulting from given external loading is counter balanced to desired degree

A

magnitude and distribution

25
Q

Assumption
Plane sections remain plane until failure, known as

A

Bernoulli’s hypothesis

26
Q

Assumption
Perfect bond between concrete and prestressing steel for

A

bonded tendons

27
Q

3 Principle of Mechanics

A
  1. Equilibrium of internal forces with external loads
  2. Compatibility of the strains in concrete
  3. Constitutive relationship
28
Q

The compression in concrete (C) is ____ to the tension (T) in tendon.

A

equal

29
Q

The couple of CT are equal to the moment due to ______

A

external loads

30
Q

_______ of the strains in concrete and in steel for bonded tendons

A

Compatibility

31
Q

The formulation involves the first assumption of plane remaining plane after

A

bending

32
Q

For unbonded tendons, the compatibility is in terms of

A

deformation

33
Q

______ relationships relating the stresses and the strains in the materials

A

Constitutive

34
Q

Variation of internal forces in reinforced concrete

A

C₂ > C₁
Z₂ ≈ Z₁

35
Q

Variation of internal forces in prestressed concrete

A

C₂ ≈ C₁
Z₂ > Z₁

36
Q

Compression and tension at transfer due to self weight symbol

A

C₁
T₁

37
Q

Compression and tension under service load symbol

A

C₂
T₂

38
Q

Self weight symbol

A

W₁

39
Q

Service load symbol

A

W₂

40
Q

Lever arm at transfer symbol

A

Z₁

41
Q

Lever arm under service load symbol

A

Z₂

PCE 3 (3 decks)

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