Soilsch11a - cohesive and cohesionless soils cohesion (C)...

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Foundation Construction Shallow Foundations
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Introduction Definition of a foundation shallow (footings) deep (or piles) Footings individual continuous or wall strap
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Foundation Design Section 11.2 Resistance to bearing capacity failure Resistant to excessive settlements
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Background - Loads on Foundations dead load live load wind load snow load earth pressure water pressure
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Background - Depth and Location Frost action effect of expansion and contraction Soil Volume change depth of 5 to 10 ft. below surface Groundwater construction (dewatering) reduced strength hydrostatic uplift frost action waterproofing problems
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Bearing Capacity Analysis Ultimate bearing capacity allowable bearing capacity factor of safety Terzaghi equations Cohesive soils Cohesionless soils
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Equations Ultimate bearing capacity q(d) = 1.3cN c + γD f N q +0.4γBN γ Allowable bearing capacity, q(a) = q(d)/FS (factor of safety)
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Terzaghi bearing factors Table 11-2 bearing capacity factors for both
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Unformatted text preview: cohesive and cohesionless soils cohesion (C) and angle of internal friction ( ) cohesion, c=q c /2 cohesive soils, is equal to zero q(d) = 7.4c + D f cohesionless soil, c is equal to zero q(d) = D f N q +0.4BN Effect of groundwater table on bearing capacity Case 1 - groundwater is below the base of the footing at a distance greater than B. = unit wt. of the soil Case 2 - groundwater is at a distance B, or less, below the base of the footing = unit weight of the soil 62.4 pcf Structural Design of Footings Size of Footing Required base area of a footing is obtained by dividing the Column Load, Q, by the allowable bearing capacity, q(a). Example problems SUMMARY You can determine the following depending on what is given in the problem: q(d) q(a) FS Q(d) Q(a) B...
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Soilsch11a - cohesive and cohesionless soils cohesion (C)...

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