Design of Slabs, Footings and Beams

13 important questions on Design of Slabs, Footings and Beams

What are the characteristics of a 1 way slab?

- Thin, typically 125 - 200 m depth
- Slender
- Spacing not an issue for longitudinal reinforcement
- No transverse shear reinforcement
- Lightly reinforced

How is the thickness of a 1 way slab found?

Based on deflection

What is the minimum reinforcement in a 1-way slab?

0.002Ag
  • Higher grades + faster learning
  • Never study anything twice
  • 100% sure, 100% understanding
Discover Study Smart

What are the spacing requirements for the BUL reinforcements in a 1 way slab?

The smallest of 5*h and 500 mm

For an inverted T-Beam, what must the area of steel reinforcement in a distance within  (clear span)/20 be greater than?

0.004 Ag, where Ag is slab thickness * ln/20

What are the characteristics of a typical footing?

- Deep, small span/depth ration
- Compression struts to resist shear
- Thick footings have transverse shear reinforcement
- Thin footings will most likely not have transverse shear reinforcement
- Thick, >2000 mm
- Can have multiple layers of reinforcement to resist shear in both directions

How are plan dimensions of a footing found?

Based on allowable bearing pressure of the soil

How is thickness of a footing found

To resist one way and two way shear

Why check bearing at the top of a footing?

HSC concrete coming onto a weaker concrete footing, check bearing to prevent crushing

What are the characteristics of a typical beam?

- Slender
- Contain minimum transverse shear reinforcement
- Longitudinal reinforcement in layers due to spacing issues

What is the purpose of minimum reinforcement in a structural concrete member?

To provide resistance against the cracking load

What is the purpose of skin reinforcement in a large beam? H>750 mm?

Crack control

What 2 factors must be considered when finding cut off lengths for longitudinal reinforcement?

Development length and diagonal shear cracking

The question on the page originate from the summary of the following study material:

  • A unique study and practice tool
  • Never study anything twice again
  • Get the grades you hope for
  • 100% sure, 100% understanding
Remember faster, study better. Scientifically proven.
Trustpilot Logo