pc lecture 2

Question 1

Are a single unit which is made up of steel

Answer 1

Wires

Question 2

Two, three or seven wires

Answer 2

Strands

Question 3

A group of strands or wires

Answer 3

Tendon

Question 4

A group of tendons

Answer 4

Cable

Question 5

A tendon can be made up of a single steel bar

Answer 5

Bars

Question 6

When there is adequate bond between the prestressing tendon and concrete

Answer 6

Bonded tendon

Question 7

Pre-tensioned and grouted post-tensioned

Answer 7

Bonded tendon

Question 8

When there is no bond between the prestressing tendon and concrete

Answer 8

Unbonded tendon

Question 9

Initial stage

Answer 9

(a) during tensioning of steel
(b) at transfer of prestress to concrete.

Question 10

Intermediate stage

Answer 10

This includes the loads during transportation of the prestressed members

Question 11

Final stage

Answer 11

(a) at service (during operation}
(b)at ultimate stage (during extreme events)

Question 12

This is the simplest type of prestressing producing large prestressing forces

Answer 12

Hydraulic prestressing

Question 13

Used for the tensioning of tendons comprises of calibrated pressure gauges, which directly indicate the magnitude of force developed during the tensioning.

Answer 13

Hydraulic jack

Question 14

Four sources of prestressing force

Answer 14

Mechanical, hydraulic, electrical and
chemical.

Question 15

Based on the location of the prestressing tendon with respect to the
concrete section.

Answer 15

External or internal prestressing

Question 16

Based on the sequence of casting the
concrete and applying tension to the tendons.

Answer 16

Pre-tensioning or post-tensioning

Question 17

Based on the shape of the member prestressed.

Answer 17

Linear or circular prestressing

Question 18

Based on the amount of prestressing force, three types of prestressing are defined.

Answer 18

Full, limited or partial prestressing

Question 19

Names suggest, the classification is based on the directions of prestressing a
member.

Answer 19

Uniaxial, biaxial or multi-axial prestressing

Question 20

This type of prestressing is adopted for
mass scale production.

Answer 20

Mechanical Prestressing

Question 21

This type of prestressing is also known as thermoelectric prestressing.

Answer 21

Electrical Prestressing