Lecture 12 Flashcards

1
Q

Prestressing

A

Initial force, applied to improve structural capacity.

Stretched tightly and then restrained by the concrete,

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2
Q

Posttensioning

A

Steel strands are tensioned after concrete has been cast and reached adequate strength.

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3
Q

Precast Concrete

A

Concrete elements, cast and cured in a manufacturing plant, then transported to the construction site.

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4
Q

Why is precast concrete unique

A
Repetitive
Highly finished
Rapid all weather erection  Industrialized
Parking structures
 Warehouses
Industrial plants
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5
Q

Precast Concrete Slabs

A

Used for floor and roof decks.
Deeper elements span further than
those that are shallower.

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6
Q

Precast Concrete Beams

A

Provide support for slabs.

The projecting reinforcing bars will bond with concrete cast on site.

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7
Q

Precast Concrete Columns

A

Provide support for beams and slabs.

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8
Q

Precast Concrete Walls

A

Precast wall panels may be solid, hollow, or sandwiched with an insulating core.
Wall panels can be ribbed, to increase their vertical span capacity while minimizing weight, or formed into other special shapes.

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9
Q

Precast Concrete Stairs

A

Uniquely shaped structural elements

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10
Q

Advantages of Precast Concrete

A

Carried out conveniently at ground level.
Mixing and pouring operations highly mechanized
Quality of materials and workmanship better
Forms can be reused

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11
Q

Disadvantages of Precast Concrete

A

Heavy and bulky
Restricts size and proportions since needs to be transported
3D sculptural possibilities are absent

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12
Q

Pretensioning

A

Steel strands are tensioned before concrete is cast

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13
Q

Solid Flat Slab

A

Slab

Widths vary

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14
Q

Hollow Core Slab

A

Slab with holes

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15
Q

Double Tee Slab

A

Slab with two Ts

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16
Q

Single Tee Slab

A

Slab with single T

17
Q

Rectangular Beam

A

Rectangular

18
Q

L-Shaped Beam

A

L-SHaped

19
Q

Inverted Tee Beam

A

Upside down T

20
Q

Aashto Beam

A

Similar to I but a bit different