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 7, Problem 7.22QPP
Conduct a bearing capacity analysis on the Fargo Grain Elevator (see sidebar) and back-calculate the average undrained shear strength of the soil. The groundwater table is at a depth of 6 ft below the ground surface. Soil strata A and B have unit weights of
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A 460 mm reinforced concrete interior spiral column carries service loads of 1025 kN dead load and 715 kN live load (Figure 3). The column rest on a square spread footing 2.75 m x 2.75 m in dimension. The net ultimate soil pressure at the base of the footing is 314 kPa, f’c =21 MPa, fy = 345 MPa, clear cover is 75 mm and 25 mm-diameter bars, the allowable soil pressure is 250 kPa? Unit weight of soil is 17kN/m3 ; unit weight of concrete is 23.5 kN/m3. The underside of footing is 1.50m below the natural grade line
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22. Calculate the effective net soil bearing capacity of the soil. = [q] kPa (one decimal place)
Chapter 7 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 7 - List the three types of bearing capacity failures...Ch. 7 - A 1.2 m square, 0.4 m deep spread footing is...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A column carrying a vertical downward unfactored...Ch. 7 - A column carrying a vertical downward ultimate...Ch. 7 - A 120 ft diameter cylindrical tank with an empty...Ch. 7 - A 1.5 m wide, 2.5 m long, 0.5 m deep spread...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A bearing wall carries a total unfactored load 220...Ch. 7 - After the footing in Problem 7.9 was built, the...
Ch. 7 - A bearing wall carries a factored ultimate...Ch. 7 - A 5 ft wide, 8 ft long, 3 ft deep footing supports...Ch. 7 - Prob. 7.13QPPCh. 7 - A spread footing supported on a sandy soil has...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - A building column carries a factored ultimate...Ch. 7 - A 3 ft square footing is founded at a depth of 2.5...Ch. 7 - A building column carries factored ultimate loads...Ch. 7 - Develop a spread sheet to compute allowable total...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - Repeat Problem 7.20 using LRFD assuming the...Ch. 7 - Conduct a bearing capacity analysis on the Fargo...Ch. 7 - Three columns, A, B, and C, are collinear, 500 mm...Ch. 7 - Two columns, A and B, are to be built 6 ft 0 in...Ch. 7 - In May 1970, a 70 ft tall, 20 ft diameter concrete...
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- A flexible circular footing of radius R carries a uniform pressure q. Find the depth (in terms of R) at which the vertical stress below the center is 20% of q.arrow_forwardA 5.0 ft wide square footing is placed at 3.0 ft depth within the ground where c = 200 lb/ft2, = 25, and = 115.0 lb/ft3. Determine the ultimate bearing capacity of the footing using Terzaghis bearing capacity equation and the bearing capacity factors from Table 6.1. What is the maximum column load that can be allowed with a factor of safety of 3.0?arrow_forwardDetermine the maximum column load that can be applied on a 1.5 m × 1.5 m square foundation placed at a depth of 1.0 m within a soil, where γ = 19.0 kN/m3, c′ = 10 kN/m2, and ф′ = 24°. Allow a factor of safety of 3.0.arrow_forward
- There are two identical foundations Footing 1 and Footing 2. Footing 1 is supporting a vertical load P with an eccentric of 50 cm and Footing 2 is supporting a same vertical load P but with an eccentricity of 100 cm. Which footing has a larger equivalent uniform bearing pressure? Footing 1 Footing 2 It depends on the soil properties It depends on the loadingarrow_forwardA strip footing 2m wide carries a load intensity of 400 kN/m2at a depth of 1.2 m in sand. The saturated unit weight of sand is 19.5 kN/m3 and unit weight above water table is 16.8 kN/m3. The shear strength parameters are C=0 and Ф = 350 . Determine the factor of safety with respect to shear failure for the following cases of location of water table :(a) Water table is 4m below G.L(b) Water table is 1.2 m below G.L(c) Water table is 2.5 m below G.L(d) Water table is 0.5 m below G.L(e) Water table is G.L itselfarrow_forwardA 1.5 m square footing is founded at a depth of 1m (equal to the foundation thickness) in fine-grained soil with the following properties: ?dry = 20 kN/m3; ?sat = 22 kN/m3; ?u,k = 70 kPa; ?k′ = 10 kPa; ?k′ = 30° The load on the footing is vertical but has a maximum eccentricity (?) of 250 mm from one axis (Hint: B- = B − 2e). If the water table is at the foundation level, determine the design bearing resistance of the footing for a. short-term condition b. long-term conditionarrow_forward
- Calculate the stress at the end of the clay stratum σ, and the increment Δσ that the footing produces a load P = 1200 KN, at points A and B Carrow_forwardA square footing which carries an axial load of 13000 kg has its bottom resting on a ground water table at a depth of 2.5 m from the ground surface. Nc = 35, Nq = 22, Nγ = 19. Take PDRY = 1910 kg/m3 and PSAT = 1600 kg/m3, c = 1800 kg/m2. Compute the net soil pressure.arrow_forwardUsing EC7A 1.5 m square footing is founded at a depth of 1m (equal to the foundation thickness)in fine-grained soil with the following properties:?dry= 20 kN/m3 ; ?sat = 22 kN/m3 ; ?u,k = 70 kPa; ?k ′ = 10 kPa; ? k ′ = 30°The load on the footing is vertical but has a maximum eccentricity (?) of 250 mm fromone axis (Hint: B - = B − 2e). If the water table is at the foundation level, determine thedesign bearing resistance of the footing fora. short-term conditionb. long-term conditionarrow_forward
- A circular ring foundation for an overhead tank transmits a contact pressure of 300 kN/m2 .Its internal diameter is 6 m and external diameter 10m. Compute the vertical stress on thecenter line of the footing due to the imposed load at a depth of 6.5 m below the ground level. The footing is founded at a depth of 2.5marrow_forwardA 3 ft square footing is founded at a depth of 2.5 ft on saturated clay and carries an unfactoredvertical column load of 65 k. The underlying clay has an undrained shear strength of 1,500 lb/ft2.Compute the allowable shear load this column can carry using ASD with a sliding factor ofsafety of 1.5.arrow_forwardSituation 7 - A long footing 2 m wide is buried at a depth of 1 m. Water table is located 0.40 m from the ground surface. Soil above the water table has a unit weight of 19.65 kN/m3 and the saturated soil has a unit weight of 21.70 kN/m3. The soil is cohesionless and has an angle of shearing resistance of 20°. Nc = 17.69, Nq = 7.44, and Nγ = 3.64. (a.) Determine the safe gross load in kN per meter width that the footing can carry assuming a factor of safety of 1.75. Hint: Overburden pressure is the effective stress from the ground surface to the bottom of the footing. Round off to two decimal places. (b.) Determine the ultimate bearing capacity of the soil in kPa. Hint: Overburden pressure is the effective stress from the ground surface to the bottom of the footing. Round off to two decimal places. (c.) Determine the overburden pressure on the soil in kPa. Hint: Overburden pressure is the effective stress from the ground surface to the bottom of the footing. Round off to two decimal…arrow_forward
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