Reinforced Concrete Slab Design

Question 1

What is the formula for a one-way slab?

Answer 1

Longer span / shorter span

Is greater than or equal to 2

Question 2

What is a one way slab?

Answer 2

A rectangular slab supported on two opposite sides only

Question 3

What is the formula for a two-way slab?

Answer 3

Longer span/shorter span

Is less than 2

Question 4

What is a two-way slab?

Answer 4

A slab supported by beams on all four sides

Question 5

How is bending designed in slabs?

Answer 5

The same as for beams

Question 6

How is shear checked for slabs?

Answer 6

The same as in beams but shortened

Question 7

How is the shear resistance capacity, Vrd,c, found for concrete slabs?

Answer 7

Using table C11 of the EC2

Question 8

How is modified Vrd,c calculated?

Answer 8

Multiply Vrd,c by modification factor in C12

Question 9

When is the slab safe without shear reinforcement?

Answer 9

If Ved (shear stress), is less than the modified Vrd,c value

Question 10

What is Vrd,c?

Answer 10

Shear resistance capacity

Question 11

How is deflection calculated in slabs?

Answer 11

Exactly the same as in beams

Question 12

What must minimum cover be equal to (at least)?

Answer 12

Main bar dia. + 10mm

Question 13

How is cover specified?

Answer 13

By providing a cover that meets the minimum axis distance obtained from table C9

Question 14

What is slab minimum axis distance = to?

Answer 14

Cover + 1/2 main bar dia.

Question 15

What is effective depth in a slab = to?

Answer 15

Total depth - cover - half main bar dia.

Question 16

How is ultimate design load calculated?

Answer 16

The same as in beams

Question 17

How is Max bending and Max shear calculated in slabs?

Answer 17

Same as in beams

Question 18

How is minimum percentage of tensile reinforcement calculated?

Answer 18

From table C10