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Queensferry

Module 06

Eccentric and inclined loading

When the load is not in the middle — and what the footing does about it.

What this module covers

  • Apply Meyerhof's effective area method to an eccentrically loaded footing
  • Derive and apply the middle-third rule, and say what happens beyond it
  • Explain why a moment and a horizontal load are different problems with different remedies
  • Recognise the combined V–H–M failure envelope that the factor method approximates

Lessons

  1. 6.1

    The effective area method

    Shrink the footing until the load is in the middle.

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  2. 6.2

    Combined V, H and M

    What the factors are approximating.

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Module checkpoint

Check what you have taken in

2 questions

  1. Question 1

    A 3.0 m square pad carries 900 kN with a moment of 360 kNm about one axis. What is the effective area, in m²?

  2. Question 2

    For a 2.4 m wide footing, what is the largest eccentricity that keeps the resultant within the middle third, in metres?