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lecture_2 - Lecture 2 Foundation Requirements Description...

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Lecture 2 Foundation Requirements Description of Allowable Stress Design Description of Loads, Load Combinations, and Factors of Safety
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Spread Footings
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Combined Footings
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Non Uniform Contact Stresses
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Cantilever or Strap Footing Develop Uniform Stresses Beneath the Footings
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Spread Footings - Mats and Rafts Mats: Reduce Differential Settlement Stresses More Uniform Rafts: Removal of Soil to Some Depth Stiffer Response on Reloading
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Laboratory Oedometer Test 0.0 0.05 0.10 Vertical Strain, ε v or ε z Void Ratio, e 1.1 0.7 0.5 10 kPa 100 kPa 1000 kPa Unloading, reloading or recompression Porous Stones Soil Sample Dial Gage Load, P
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Deep Foundation L = 50 ft to 200 ft D = diameter or width = 10” to 12 ft Driven or Cast Insitu Columns or Piers Spacing 3D to 5D Pile or Shaft Cap
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Criteria for Satisfactory Foundation Design
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Spread Footing Structural Member or System Load is transferred to approximately to a depth 2B below footing Soil properties may be modified, i.e. compacted within 2B Contact stress are limited (2 to 4 tsf) B 2B
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