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Ultimate Bearing Capacity of a Footing

Mediumbearing capacityfoundations
Use qult = cNc + qNq + 0.5γBNγ with c = 20 kPa, Nc = 30, q = 40 kPa, Nq = 18, γ = 18 kN/m3, B = 2 m, and Nγ = 15. What is the ultimate bearing capacity?
  1. A870 kPa
  2. B1,050 kPa
  3. C1,590 kPa
  4. D2,190 kPa
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Answer: C. 1,590 kPa

Compute the three terms: cNc = 20(30) = 600 kPa; qNq = 40(18) = 720 kPa; 0.5γBNγ = 0.5(18)(2)(15) = 270 kPa. Sum = 600 + 720 + 270 = 1,590 kPa.
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