TERMINOLOGIES - MIDTERM

Question 1

in post-tensioned members, the hardware used to transfer force from prestressed resaforcement to the concrete,

Answer 1

ANCHORAGE DEVICE

Question 2

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

Answer 2

ANCHORAGE DEVICE, BASIC MONOSTRAND

Question 3

is an anchorage device used with multiple strands, bars, or wires, or with single bars larger than 16 mm diameters

Answer 3

ANCHORAGE DEVICE, BASIC MULTISTRAND

Question 4

is a steel element either cast into concrete or post-installed into a hardened concrete member and used to transmit applied loads to the concrete.

Answer 4

ANCHOR

Question 5

is a headed bolt, headed stud, or hooked bolt (J- or L-bolt) installed before placing concrete.

Answer 5

ANCHOR, CAST-IN

Question 6

is a cast-in steel anchor that develops its tensile strength from the mechanical interlock provided by either a head or nut at the embedded and of the anchor

Answer 6

ANCHOR, HEADED BOLT

Question 7

is an anchorage device that satisfies tests required in Section 425.9.3.1c.

Answer 7

ANCHORAGE DEVICE, SPECIAL

Question 8

in post-tensioned members, portion of the member through which the concentrated prestressing force is transferred to the concrete and distributed more uniformly across the section; its extent is equal to the largest dimension of the cross section; for anchorage devices located away from the end of a member, the anchorage zone includes the disturbed regions ahead of and behind the anchorage device.

Answer 8

ANCHORAGE ZONE

Question 9

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

Answer 9

CONCRETE, PRESTRESSED

Question 10

is a conduit, plain or corrugated, to accommodate prestressing reinforcement for post-tensioning applications.

Answer 10

DUCT

Question 11

is an ability of a structure or member to resist deterioration that impairs performance or limits service life of the structure in the relevant environment considered in design.

Answer 11

DURABILITY

Question 12

is a distance measured from extreme compression fiber to centroid of Tension reinforcement

Answer 12

EFFECTIVE DEPTH OF SECTION

Question 13

is a stress remaining in prestressing reinforcement after all losses in have occurred

Answer 13

EFFECTIVE PRESTRESS

Question 14

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

Answer 14

POST-TENSIONING

Question 15

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

Answer 15

PRECOMPRESSED TENSILE ZONE

Question 16

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

Answer 16

PRETENSIONING

Question 17

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

Answer 17

REINFORCEMENT PRESTRESSED

Question 18

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

Answer 18

REINFORCEMENT, BONDED PRESTRESSED

Question 19

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

Answer 19

REINFORCEMENT, PRESTRESSING

Question 20

Anchorages and couplers for tendons shall develop at least _____________ when tested in an unbonded condition, without exceeding anticipated ser.

Answer 20

95 percent of fpu

Question 21

Anchorages and couplers for bonded tendons shall be located so that ____________ shall be developed at critical sections after the post-tensioned reinforcement is bonded in the member.

Answer 21

100 percent of fpu

Question 22

T or F
Mono strand or single 16 mm or smaller diameter bar anchorage devices shall meet the bearing resistanc and local zone requirements of ACT 423.7;

Answer 22

T

Question 23

Strength Reduction Factor for Post-tensioned anchorage zones

Answer 23

0.85

Question 24

Strength Reduction Factor for Anchors in concrete Elements

Answer 24

0.45 to 0.75

Question 25

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.

Answer 25

SHEATHING

Question 26

In post-tensioned members, a tendon is a complete assembly consisting of anchorages, prestressing reinforcement, and sheathing with coating for unbounded applications or ducts filled with grout for bonded applications.

Answer 26

TENDON

Question 27

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

Answer 27

TENDON, BONDED

Question 28

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

Answer 28

TENDON, EXTERNAL

Question 29

is a tendon in wluch 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.

Answer 29

TENDON, UNBONDED

Question 30

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

Answer 30

TRANSFER

Question 31

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

Answer 31

TRANSFER LENGTH

Question 32

Prestress losses shall be considered in the calculation of the effective tensile stress in the prestressed reinforcement, fse, and shall include

Answer 32

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

Question 33

ASTM A416M

Answer 33

STRAND

Question 34

ASTM A421M

Answer 34

WIRE

Question 35

ASTM A421M

Answer 35

low-relaxation wire including. Supplementary Requirement S1 “Low-Relaxation Wire and Relaxation Testing”

Question 36

ASTM A722M

Answer 36

high-strength bar

Question 37

Required strength U shall include internal load effects due to reactions induced by prestressing with a load factor of

Answer 37

1.0

Question 38

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

Answer 38

1.2