For a footing subjected to a significantly eccentric vertical load, the effective footing area is used because:
Correct answer: C. Part of the base may lose contact with the soil
- A. The entire base remains uniformly compressed
- B. The soil cohesion becomes equal to zero
- C. Part of the base may lose contact with the soil
- D. The footing automatically behaves as a pile
Explanation
An eccentric load produces a nonuniform contact pressure, and excessive eccentricity can cause part of the footing base to separate from the soil. Effective dimensions are therefore used to assess the compressed contact area and bearing capacity.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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