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 7.5QPP
A column carrying a vertical downward ultimate factored load of 1 ,500 kN is to be supported on a 1 m deep square spread footing. The soil beneath this footing is an undrained clay with
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A continuous footing is shown in Figure 16.17. Using Terzaghi’s bearing capacity factors, determine the gross allowable load per unit area (all ) that the footing can carry. Assume general shear failure. Given: γ = 19 kN/m3, c′ = 31kN/m2 , , Df = 1.5 m, B = 2 m, and factor of safety = 3.5.
Q#2: Compute the allowable load using the General (Meyerhof) Bearing Capacity equation for the rectangular footing and soil parameters shown in Figure # 2. Use a safety factor of 3 and assume dimension of footing B = 1m, and L = 2m.
Subject: Geotechnical Design
A square footing which carries an axial load of 132530 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 = 1846 kg/m3 and PSAT = 1965 kg/m3, C = 1605 kg/m2. (Nc = 35, Nq = 22, Nγ = 19). Compute the required width of the footing using a factor of safety of 3.
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 square footing (B B) must carry a gross allowable load of 1160 kN. The base of the footing is to be located at a depth of 2 m below the ground surface. If the required factor of safety is 4.5, determine the size of the footing. Use Terzaghis bearing capacity factors and assume general shear failure of soil. Given: = 17 kN/m3, c = 48 kN/m2, =31.arrow_forwardRefer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The distance between the two column loads L3 = 13.5 ft. The proximity of the property line at the left edge requires that L2 = 3.0 ft. The net allowable soil pressure is 2500 lb/ft2. Determine the breadth and length of a rectangular combined footing.arrow_forwardA 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, = 26, = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forward
- A column carrying a load of 750 kN is to be founded on a square footing at a depth of 2m below the ground surface in a deep clay stratum. What will be the size of the footing if a factor of safety of 2.5 is considered? Pertinent soil parameters are saturated unit weight of 18.5kN/m^3 , cohesion of 30 kPa and angle of internal friction of 18°. The groundwater is at the base of the footing but is expected to rise to the ground level during the rainy seasons.arrow_forwardA column carrying a load of 750 kN is to be founded on a square footing at a depthof 2 m below the ground surface in a deep clay stratum. What will be the size of thefooting if a factor of safety of 3 is considered? Pertinent soil parameters are saturatedunit weight of 18.5 kN/m3, cohesion of 22.5 kPa and angle of internal friction of 18°. Thegroundwater is at the base of the footing but is expected to rise to the groundlevel during the rainy seasons.arrow_forwardAn isolated footing having dimensions of 1.5m x 2.2m is provided at a depth of 1.2m in a stratum of cohesionless soil having a relative density of 71%. Determine the bearing capacity factors Nc, Nq and Nγ as per IS code.arrow_forward
- Determine the ultimate bearing capacity of a 1.3 m wide strip footing foundedat a depth of 1m below the ground surface. Soil parameters are φ′ = 36° c′ =10 kPa, and γ = 18 kN/m 3.arrow_forwardDetermine the allowable soil bearing capacity of a cohesionless soil for a 3 ft wide strip footing, bottom of footing at 3 ft below ground level using Terzaghi’s equation. Friction Angle: 35° Unit weight of soil: 120 lbs/ft3 Factor of safety: 3.0arrow_forwardA long footing is to be constructed in the slope of a clay hillside that makes an inclination of 30° with the horizontal. The cohesion of the clay is 1,500 psf, and the unit weight is 105 pcf. If the slope stability factor is zero and the D/B ratio is close to zero, what width footing is required to support a wall loading of 8,000 lb per foot of length? Use a factor of safety of 3.arrow_forward
- Considering general shear failure , compute the gross allowable load of a rectangular footing 6mlong by 1.25m wide using a load factor (FS) of 2.50. The depth of the bottom is 4.50 m below theground surface. Cohesion of soil is 30 kPa, unit weight of soil is 19.20 kN/m3 and angle of friction is10°.arrow_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_forwardA square footing 2.8 m X 2.8 m is constructed on a uniform bed of sand with a density of 18 kN/m3 and a slope of = 36o. Determine the safe load that may be applied to the footing if the foundation depth is 1.8 m.arrow_forward
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