Foundation Design: Principles and Practices (3rd Edition)
Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 3, Problem 3.8QPP

A vertical load of 20 k is applied to a 6.0 × 4.0 ft area at the ground surface that is level.

a. Compute the induced vertical stress, Δ σ z , at a point 6.0 ft below the comer of this rectangular loaded area.

b. Compute the induced vertical stress, Δ σ z , at a point 6.0 ft below the center of this rectangular loaded area.

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6. A concentrated load of 1500 KN is applied at the ground surface at point A whose coordinate is (0,0,0). a. Determine the vertical stress, in KN at a point 2.5 m directly below A. b. Determine the vertical stress, in KN at a point whose coordinate is (1.5, 0, 2.5). C. Determine the vertical stress, in KN at a point whose coordinate is (1.5, 2, 2.5).
A vertical load of 320 kips is applied to a 5ft by 5ft area at the ground surface that is level in the figure on the right. a. Compute the induced vertical stress, Az, at a point 3 ft below the corner of this square loaded area using B's equation. b. Compute the induced vertical stress, Aoz, at a point 3 ft below the center of this square loaded area using the chart. c. Compute the average induced vertical stress, Aoz, at a depth of 3 ft below this square loaded area using the 1:2 method. Solution: • Preliminary Calculations: 1). Area of the footing: A = ● 2). Bearing pressure at the bottom of the footing: q = Calculation of induced stress: a). Below the corner using the B's equation: 1). m = 2). n = 3). Io = 2). 4). Az,corner psf; b). Below the center using the chart (or the square footing equation): Zf 1). // B B || 3). Io = = = 4). Az, center c). Averaged induced streess below the footing: 1). Io: = ft²; 2). Az, average || psf; psf; psf; Silty Sand: (SM) Clayey Silt (ML) ▼ A 12 ft.…
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