shallow foundations 4

shallow foundations 4 - Shallow Foundations 4 Foundation...

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Shallow Foundations 4 Foundation Design CE 482
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Overview Consider idealized situation on figure Elasto-plastic material loaded by stress increment After shear stress reaches “c”, further shear distortion can occur at constant shear stress
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Idealized Scenario
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Stress-Strain Behavior
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Stress-Strain Behavior
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Stress-Strain Behavior
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Stress-Strain Behavior
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Stress-Strain Behavior
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Actual Observed Behavior
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Design Criteria
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Types of Settlement
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Allowable Settlement
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Tower of Piza
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Tower of Piza
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Tower of Piza
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Angular Distortion
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Distortion vs. Diff. Settlmt.
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Maximum vs. Diff. Settlmt.
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Effect of Local Shear Failure
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Settlement at Failure
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N-values vs. Settlement
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Predicted vs. Observed Settlement
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Summary Bearing stress must be less than bearing capacity Settlement must be less than allowable As footing is loaded to failure, local shear occurs before general shear Local shear occurs when the strength of the soil in a zone is reached an the zone becomes plastic General shear occurs when all the soil along a slip surface is at failure
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shallow foundations 4 - Shallow Foundations 4 Foundation...

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