G4 - Slabs LT #2 - Slab-on grade & Suspended

Question 1

What is the difference between a flat plate slab and a flat slab?

Answer 1

1) Flat plate has a plain soffit
2) Flat slab will have a drop panel or column capital

Question 2

What advantage do column capital give?

Answer 2

Increase shear strength and reduce span

Question 3

What direction does load-carrying steel span?

Answer 3

Perpendicular to the beams

Question 4

Dome pans are used in which type of slab?

Answer 4

Two way

Question 5

How does a two-way joist system differ from a single-joist system?

Answer 5

Two-way joists run in 2 directions, One way joists run in one direction

Question 6

In what sequence does form stripping usually take?

Answer 6

Beam sides first then the slab soffit

Question 7

How are wooden T-shores set to elevation?

Answer 7

Wedged

Question 8

How are forms for drop panels supported?

Answer 8

Shores, stringers and joists

Question 9

What is the slenderness ratio?

Answer 9

1:50 MIN thickness of post:Unsupported height

Question 10

Describe three ways single shorers are made adjustable

Answer 10

1) Screw jacks
2) Wood wedges
3) Ellis clamp

Question 11

Why are re-shores not fitted tightly to the concrete that they are supporting?

Answer 11

To not place undue pressure on the concrete while reshoring

Question 12

Describe a slab table

Answer 12

Truss shoring, stringers, joists, plywood deck and screw jacks

Question 13

What are flying forms?

Answer 13

Fly tables or gang forms LIFTED by crane

Question 14

How are Aluma-beams attached to the falsework?

Answer 14

Slotted bottom and bolt

Question 15

What is a mudsill used for?

Answer 15

Distribute the weight

Question 16

Using a slenderness ratio of 1:50, what is the maximum unsupported height of a rough 4x4?

Answer 16

(4 X 50 ) / 12 = 16’8

Question 17

Flat plate slab relies on what for it’s own strength?

Answer 17

It free spans to support and relies on its own strength and rebar, won’t span very far.

Question 18

What is a flat slab?

Answer 18

Similar to flat plate
1) Columns hold slab up, either a column capital or drop panel or both

Question 19

What is a column capital?

Answer 19

Column capital and drop panels add extra concrete at the shear areas above the columns, reducing the unsupported span of the slab

Question 19

What is a column capital?

Answer 19

Column capital and drop panels add extra concrete at the shear areas above the columns, reducing the unsupported span of the slab

Question 20

What is a one-way slab?

Answer 20

Support running from column to column one way

Question 21

What is a two-way slab?

Answer 21

Steel runs in both directions

Question 22

Describe a one-way ribbed slab.

Answer 22

Series of metal pans secured end to end to the slab deck to create a joist pattern in slab

Question 23

In a ribbed slab, the pour is:

Answer 23

Monolithic and thin, reducing some of the dead loads of the building.

Question 24

What does a slab band do?

Answer 24

Similar job to the drop panel, except they span continuously from column to column, in one direction only.

Question 25

The beam at the perimeter of a suspended slab is called what?

Answer 25

A spandrel beam

Question 26

How are capital forms designed?

Answer 26

To attach to the column’s formwork at the top. Very economical as they can be used again and again. Pre-fab metal and fiberglass mold.

Question 27

What is a drop panel?

Answer 27

Basically square in shape and flat on the bottom, easier to form out of plywood

Question 28

The underside of the slab is known as

Answer 28

Soffit

Question 29

Plywood is known as

Answer 29

decking

Question 30

Shoring is referred to as

Answer 30

Falsework

Question 31

Falsework supports what

Answer 31

The formwork for the concrete structure

Question 32

What does falsework require?

Answer 32

1) Foundation
2) Vert/Horizontal structural components
3) Horizontal bracing in both direction and diagonal bracing

Question 33

Falsework can be built from wood using

Answer 33

4x4, etc, with 1x6 for bracing

Question 34

Today most shoring is:

Answer 34

Steel or aluminum, metal is stronger and prefab makes easy and quick set up

Question 35

What is the slenderness ratio?

Answer 35

Not exceed 1:50, where 1 is proportional to the minimum cross-sectional dimension and 50 is the unsupported height of the shore

Question 36

What are the two common fly forms?

Answer 36

Gang forms used for forming walls and slab tables used for suspended slabs