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

1
Q

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

A

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

2
Q

What advantage do column capital give?

A

Increase shear strength and reduce span

3
Q

What direction does load-carrying steel span?

A

Perpendicular to the beams

4
Q

Dome pans are used in which type of slab?

A

Two way

5
Q

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

A

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

6
Q

In what sequence does form stripping usually take?

A

Beam sides first then the slab soffit

7
Q

How are wooden T-shores set to elevation?

A

Wedged

8
Q

How are forms for drop panels supported?

A

Shores, stringers and joists

9
Q

What is the slenderness ratio?

A

1:50 MIN thickness of post:Unsupported height

10
Q

A

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

11
Q

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

A

To not place undue pressure on the concrete while reshoring

12
Q

Describe a slab table

A

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

13
Q

What are flying forms?

A

Fly tables or gang forms LIFTED by crane

14
Q

How are Aluma-beams attached to the falsework?

A

Slotted bottom and bolt

15
Q

What is a mudsill used for?

A

Distribute the weight

16
Q

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

A

(4 X 50 ) / 12 = 16’8

17
Q

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

A

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

18
Q

What is a flat slab?

A

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

19
Q

What is a column capital?

A

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

19
Q

What is a column capital?

A

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

20
Q

What is a one-way slab?

A

Support running from column to column one way

21
Q

What is a two-way slab?

A

Steel runs in both directions

22
Q

Describe a one-way ribbed slab.

A

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

23
Q

In a ribbed slab, the pour is:

A

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

24
Q

What does a slab band do?

A

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

25
Q

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

A

A spandrel beam

26
Q

How are capital forms designed?

A

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.

27
Q

What is a drop panel?

A

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

28
Q

The underside of the slab is known as

A

Soffit

29
Q

Plywood is known as

A

decking

30
Q

Shoring is referred to as

A

Falsework

31
Q

Falsework supports what

A

The formwork for the concrete structure

32
Q

What does falsework require?

A

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

33
Q

Falsework can be built from wood using

A

4x4, etc, with 1x6 for bracing

34
Q

Today most shoring is:

A

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

35
Q

What is the slenderness ratio?

A

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

36
Q

What are the two common fly forms?

A

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