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Prestressed Concrete Design > MIDTERM NSCP TERMS > Flashcards

MIDTERM NSCP TERMS Flashcards

1
Q

used to transfer force from pre-stressed reinforcement to the concrete

A

ANCHORAGE DEVICE

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2
Q

is an anchorage device used with any single strand or a single 16 mm or smaller diameter bar

A

ANCHORAGE DEVICE, BASIC MONOSTRAND

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3
Q

is an anchorage device with multiple strands bars or wires or with single bars larger than 16 mm diameter

A

ANCHORAGE DEVICE, BASIC MULTISTRAND

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4
Q

is an anchorage device that satisfies test required

A

ANCHORAGE DEVICE, SPECIAL

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5
Q

includes the disturbed regions ahead of and behind the anchorage device

A

ANCHORAGE ZONE

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6
Q

is a concrete in which internal stresses have been introduced to reduce potential tensile stresses in concrete resulting from service loads

A

CONCRETE, PRESTRESSED

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7
Q

is a conduit, plane, or corrugated to accommodate free stressing reinforcement for post tensioning applications

A

DUCT

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8
Q

is a stress remaining in prestressing reinforcement after all losses

A

EFFECTIVE PRESTRESS

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9
Q

temporary force exerted by device that introduces tension into prestressing reinforcement.

A

JACKING FORCE

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10
Q

is a method of prestressing in which prestressing reinforcement is tensioned after concrete has hardened.

A

POST-TENSIONING

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11
Q

is a portion of a prestressed member where flexural tension, calculated using gross section properties, would occur under service loads if the prestress force was not present.

A

PRECOMPRESSED TENSILE ZONE

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12
Q

is a method of prestressing in which prestressing reinforcement is tensioned before concrete is cast.

A

PRETENSIONING

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13
Q

is a prestressing reinforcement that has been tensioned to impart forces to concrete.

A

REINFORCEMENT, PRESTRESSED

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14
Q

is a pretensioned reinforcement or prestressed reinforcement in a bonded tendon.

A

REINFORCEMENT, BONDED PRESTRESSED

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15
Q

is a high- strength reinforcement such as strand, wire, or bar

A

REINFORCEMENT, PRESTRESSING

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16
Q

is a material encasing prestressing reinforcement to prevent bonding of the prestressing reinforcement with the surrounding concrete, to provide corrosion protection, and to contain the corrosion inhibiting coating.

A

SHEATHING

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17
Q

is a complete assembly consisting of anchorages, prestressing reinforcement, and sheathing with coating for unbounded applications or ducts filled with grout for bonded applications.

A

TENDON

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18
Q

is a tendon in which prestressed reinforcement is continuously bonded to the concrete through grouting of ducts embedded within the concrete cross section.

A

TENDON, BONDED

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19
Q

is a tendon external to the member concrete cross section in post-tensioned applications.

A

TENDON, EXTERNAL

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20
Q

is a tendon in which prestressed reinforcement is prevented from bonding to the concrete. The prestressing force is permanently transferred to the concrete at the tendon ends by the anchorages only.

A

TENDON, UNBONDED

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21
Q

is an act of transferring stress in prestressing reinforcement from jacks or pretensioning bed to concrete member.

A

TRANSFER

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22
Q

is a length of embedded pretensioned reinforcement required to transfer the effective prestress to the concrete.

A

TRANSFER LENGTH

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23
Q

Φ = 0.60

A

Plain concrete elements

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24
Q

Φ = 0.65

A

Bearing

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25
Q

Φ = 0.75

A

-Shear
-Struts
-Torsion
-Ties
-Brackets
-Bearing areas
-Corbels
-Nodal zones

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26
Q

Φ = 0.85

A

Post tensioned anchorage zones

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27
Q

Strength reduction factor for Components of connection of precast members controlled by yielding of steel elements in tension

A

Φ = 0.90

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28
Q

Φ = 0.65 to 0.90

A

-Moments
-Axial force
-Combined moment and Axial force

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29
Q

Prestress losses shall be considered in the calculation of the effective tensile stress in the prestressed reinforcement, fse, and shall include (a) through (f):

A

a. Prestressed reinforcement seating at transfer;
b. Elastic shortening of concrete;
c. Creep of concrete;
d. Shrinkage of concrete;
e. Relaxation of prestressed reinforcement;
f. Friction loss due to intended or unintended curvature in post-tensioning tendons.

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30
Q

2 Calculated friction loss in post-tensioning tendons shall be based on experimentally determined ________

A

wobble and curvature friction coefficients.

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31
Q

special moment frames and special structural walls, prestressing reinforcement shall conform to (a), (b), (c), or (d):

A

a. ASTM A416M- strand;
b. ASTM A421M - wire;
c. ASTM A421M- low-relaxation wire including, Supplementary Requirement S1 “Low-Relaxation Wire and Relaxation Testing”;
d. ASTM A722M-high-strength bar.

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32
Q

all components of special structural walls including coupling beams and wall piers, cast using precast concrete shall comply with ______

A

ASTM A416M or A722M.

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33
Q

Effect of loss of area due to open ___ shall be considered in computing section properties before grout in post-tensioning ducts has attained design strength.

A

ducts

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34
Q

shall include self-weight; applied loads; and effects of prestressing, earthquakes, restraint of volume change, and differential settlement.

A

Loads

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34
Q

shall include internal load effects due to reactions induced by prestressing with a load factor of 1.0.

A

Required strength U

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35
Q

For post-tensioned anchorage zone design, a load factor of ____ shall be applied to the maximum prestressing reinforcement jacking force.

A

1.2

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36
Q

Anchorage and couplers for tendons shall develop at least ____ of fpu

A

95%

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37
Q

Anchorages and couplers for BONDED TENDONS shall be located so that ____ of fpu shall be developed

A

100%

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38
Q

Total quantity of As and Aps shall be adequate to develop a factored load at least ____ times the cracking load on the basis of ___

A

1.2
fr

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39
Q

For ______ , gross concrete area shall consist of the total beam area including the slab thickness and the slab area within half the clear distance to adjacent beam webs

A

monolithic,
cast-in-place,
post tensioned beam and
slab construction

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40
Q

If the slabs are supported on walls or not cast monolithically with beams, gross concrete area is the slab section _______ to the tendon or tendon group

A

Tributary

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41
Q

the distance between the face of the beam or wall to the nearest slab tendon shall not exceed ____

A

1.8m

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42
Q

If spacing of slab tendons exceeds _____, additional deformed shrinkage and temperature reinforcement.

A

1.4m

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43
Q

is used as a multiplier of √f’c

A

modification factor, λ

44
Q

λ = 0.75

A

All-lightweight

45
Q

λ = 0.75 to 0.85

A

Lightweight, Fine blend

46
Q

λ = 0.85

A

Sand-Lightweight

47
Q

λ = 0.85 to 1.00

A

Sand-Lightweight, Coarse Blend

48
Q

λ = 1.00

A

Normal-weight
Composition of aggregates: Fine of Coarse: ASTM C33M

49
Q

Linear interpolation from 0.75 to 0.85 is permitted based on absolute volume of normal weight ________

A

fine aggregates

50
Q

Linear interpolation from 0.85 to 1.00 is permitted based on absolute volume of normal weight ________

A

coarse aggregates

51
Q

The value of Δfps shall not exceed _____

A

250 Mpa

52
Q

The local zone shall be assumed to be _____

A

rectangular prism

53
Q

_______ includes the local zone and shall be assumed to be the portion of the member.

A

The general zone

54
Q

_______ anchorage devices shall meet the bearing resistance and local zone requirements of ACI 423.7

A

Mono strand or single 16mm or smaller diameter bar

55
Q

______ anchorage devices shall meet the bearing resistance of AASHTO LRFD Bride Design Specfications

A

Basic multi-strand

56
Q

AASHTO stands for?

A

American Association of Highway and Transportation Officials (AASHTO)

57
Q

LRFD stands for?

A

Load and Resistance Factor Design (LRFD)

58
Q

the ____ of the general zone shall be taken as the spacing of the tendons

A

depth

59
Q

SIMPLIFIED EQUATIONS

A

a. Member cross sections are non-rectangular;
b. Discontinuities in or near the general zone cause deviations in the force flow path;
c. Minimum edge distance is less than 1.5 times the anchorage device lateral dimension in that direction;
d. Multiple anchorage devices are used in other than one closely spaced group;
e. Centroid of the tendons is located outside the kern;
f. Angle of inclination of the tendon in the general zone is less than -5 degrees from the centerline of axis of the member, where the angle is negative if the anchor force points away from the centroid of the section;
g. Angle of inclination of the tendon in the general zone is greater than +20 degrees from the centerline of axis of the member, where the angle is positive if the anchor force points towards the centroid of the section.

60
Q

Centroid of the tendons is located outside the ______

A

kern

61
Q

Angle of inclination of the tendon in the general zone is less than ______ from the centerline of axis of the member, where the angle is NEGATIVE if the anchor force points away from the centroid of the section

A

-5 degrees

62
Q

Angle of inclination of the tendon in the general zone is greater than _____ from the centerline of axis of the member, where the angle is POSITIVE if the anchor force points towards the centroid of the section.

A

+20 degrees

63
Q

For anchorage devices located away from the end of the member, bonded reinforcement shall be provided to transfer at least _____

A

0.35Ppu

64
Q

_____ shall be provided parallel to the slab edge

A

Two horizontal bars at least 12mm ⌀

65
Q

If the center-to-center spacing of anchorage devices is ____ or less, the anchorage devices shall be considered as a group

A

300mm

66
Q

Compressive strength of ____ for single strand or bar tendons

A

17 Mpa

67
Q

Compressive strength of ____ for multi strand tendons

A

28 Mpa

68
Q

Compressive stress in concrete at nominal strength shall not exceed ____

A

0.7λf’ci

69
Q

Maximum design tensile stress for Non-prestressed reinforcement

A

fy

69
Q

Maximum design tensile stress for UNBOUNDED, prestressed reinforcement

A

fse + 70

70
Q

Maximum design tensile stress for Bonded, prestressed reinforcement

A

fpy

71
Q

Slabs prestressed with an average effective compressive stress less than ____ shall be designed as non-prestressed slabs

A

0.90 Mpa

72
Q

Prestressed two way slabs shall be designed as ____ with ft ≤ 0.50√ f’c

A

Class U

72
Q

Resultant tensile force acting on the portion

A

Nc

73
Q

the value of fy shall not exceed ____

A

420 Mpa

74
Q

In positive moment areas, length of reinforcement shall be at least _____ and be centered in those areas

A

ln/3

75
Q

In negative moment areas, length of reinforcement shall be at least _____ on each side of the face of support

A

ln/6

76
Q

In prestresses beams, _____ of thin webs and flanges shall be considered.

A

buckling

77
Q

Vu Critical section located ____ from the face of the support for non-prestressed beams.

A

d

78
Q

Vu Critical section located ____ from the face of the support for prestressed beams.

A

h/2

79
Q

For prestresses beams, the total area of longitudinal reinforcement , As and Aps, at each section shall be designed to resist ______

A

Mu

80
Q

_______ shall be attached to the member in a manner that manner that maintains the specified eccentricity

A

External tendons

81
Q

For non-prestressed columns and for prestressed columns with average fpe < ____ MPa, area of longitudinal reinforcement shall be at least ______ but shall not exceed ______.

A

1.6
0.01Ag
0.08Ag

82
Q

For non-prestressed columns and for prestressed columns with average fpe < 1.60 MPa, the minimum number of longitudinal bars shall be (a), (b), or (c):

A

a. Three within triangular ties;
b. Four within rectangular or circular ties;
c. Six enclosed by spirals or for columns of special moment frames enclosed by circular hoops.

83
Q

For prestressed columns with average fpe ≥ 1.6 MPa, transverse ties or hoops need not satisfy the ____ spacing requirement

A

16db

84
Q

Precast prestressed concrete piles shall have a specified compressive strength f’c of not less than ____ and shall develop a compressive strength of not less than _____ before driving.

A

35 MPa
27 MPa

85
Q

The longitudinal reinforcement shall be high-tensile seven-wire strand conforming to _______.

A

ASTM Standards

86
Q

Longitudinal reinforcement shall be laterally tied with _______.

A

steel ties or wire spirals

87
Q

Ties or spiral reinforcement shall not be spaced more than _____ apart, center to center, for a distance of 600 mm from the ends and not more than 200 mm elsewhere.

A

75 mm

88
Q

At each end of the pile, the first five ties or spirals shall be spaced ______ center to center.

A

25 mm

89
Q

Effective prestress shall be based on an assumed loss of _______ in the prestressing steel.

A

200 MPa

89
Q

For piles having a diameter of 600 mm or less, wire shall not be smaller than _______

For piles having a diameter greater than 600 mm but less than 900 mm, wire shall not be smaller than ________

For piles having a diameter greater than 900 mm, wire shall not be smaller than ______

A

5.5 mm (No. 5 B.W.gage).
6 mm (No. 4 B.W.gage).
6.5 mm (No.3 B.W.gauge).

90
Q

The effective prestress in the pile shall not be less than
______ for piles up to 10 m in length,
_______ for piles up to 15 m in length, and
_______for piles greater than 15 meters in length.

A

2.5 MPa
4 MPa
5 MPa

91
Q

The dowels and the faces shall then be joined by ______

A

Structural epoxy

92
Q

Prestressing steel shall be _____ in potential plastic regions

A

unbonded

93
Q

Anchorages of post tensioning tendons resisting earthquake induced forces shall be capable of allowing tendons to withstand ____ cycles of loading with prestressed reinforcement forces bounded by _______ percent of the specified tensile strength of the prestressing steel.

A

50
40 and 85

94
Q

For the upper 20 ft (6 m) of precast prestressed piles, the minimum volumetric ratio of spiral reinforcement shall not be less than ______

A

0.007

95
Q

Yield strength of spiral reinforcement

A

586 MPa

96
Q

ASTM stands for?

A

American Society for Testing and Materials

97
Q

The average prestress, fpc, calculated for an area equal to the smallest cross-sectional dimension of the beam multiplied by the perpendicular cross-sectional dimension shall not exceed the lesser of ______

A

3.5 MPa and f’c/10

98
Q

Prestressing steel shall be ______ in potential plastic hinge regions, and the calculated strains in prestressing steel under the design displacement shall be less than _____

A

unbonded
one percent

99
Q

Prestressing steel shall not contribute more than ________ of the positive or negative flexural strength at the critical section in a plastic hinge region and shall be anchored at or beyond the exterior face of the joint

A

one- fourth

100
Q

Water soluble chloride ion content for bonded tendons shall not exceed _____ when tested with ________

A

0.06
ASTM C1218M

101
Q

Modulus of elasticity for prestressing

A

Ep

102
Q

Tensile strength for prestressed

A

fpu

103
Q

Maximum value of fpu for
Type: Strand (Stressed relieved and low relaxation)
ASTM 416M

A

1860 Mpa

104
Q

Maximum value of fpu for
Type: Wire (Stressed relieved and low relaxation)
ASTM 421M

A

1725 Mpa

105
Q

Maximum value of fpu for
Type: High strength bar
ASTM 722M

A

1035 Mpa

Prestressed Concrete Design (4 decks)

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