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 7.9QPP
A bearing wall carries a total unfactored load 220 kN/m. It is to be supported on a 400 mm deep continuous footing. The underlying soils are medium sands with
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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.
Solve Problem 2 using the general bearing capacity equation
Problem 2) A 1.5 m wide square footing is placed at 1 m depth within the ground where c = 10 kN/m², varphi' = 25 ^ 0 and 18 kN/m³. Determine the ultimate bearing capacity of the = footing using Terzaghi's bearing capacity equation. What is the maximum column load that can be allowed with a factor of safety of 3.0?
A circular footing 3 m in diameter is shown below. Assume the general shear failure and use a factor of safety 2.8. Determine the follow?? = ??. ?? , ?? = ??. ??, ?? = ?. ??a. The gross allowable bearing capacity.b. Net Allowable bearing capacityc. The safe load that the footing can carry.
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 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_forwarda) A square footing placed at a depth of 1 m is required to carry a load of 1000 kN. Find the required size of footing given the following data. C = 10 kPa, ϕ = 38o, γ = 19 kN/m3, Nc = 61.35, Nq = 48.93, Nγ= 74.03 and F = 3.Assume water table is at the base of footing.arrow_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
- A strip footing is to be designed to support a dead load of 500 kN/m and an imposed load of 300 kN/m at a depth of 0.7 m in a gravelly sand. Characteristic values of the shear strength parameters are c' = 0 and ϕ' =40˚. (a) Determine the required width of the footing if a factor of safety of 3.0 and assuming that the water table may rise to foundation level. (b) Would a foundation of that width satisfy the bearing resistance limit state? The unit weight of the sand above the water table is 17 kN/m3 and below the water table the saturated unit weight is 20 kN/m3.arrow_forwardA strip footing is to be designed to carry a load of 800 kN/m at the depth of 7m in a gravelly sand . the appropriate shear strenght parameter are c =0 and φ=40o. Determine the width of the footing if a factor of safety 3 against shear failure is specified and assuming that that the water table may raise to foundation level.Above the water table the unit weight of the sand is 17 kn/m3 and below the water table the saturated unit weight is 20 kN/m3arrow_forwardi) A strip footing of width B=1m is embedded 0.6m in soil. The soil has unit weight equal to 19kN/m3 and a critical-state friction angle Øc of 32o . Assume water table to be deep, what is the ultimate bearing capacity of the soil? ii) A square footing is to be constructed on a deep deposit of sand at a depth of 0.9 m to carry a design load of 300 kN with a factor of safety of 2.5. The ground water table may rise to the ground level during rainy season. Design the plan dimension of footing given γsat = 20.8 kN/m3 , Nc = 25, Nq = 34 and Nγ =32.arrow_forward
- Refer to Problem 16.1. If a square footing with dimension 2 m 2 m is used instead of the wall footing, what would be the allowable bearing capacity? 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17arrow_forwardRedo Problem 16.1 with the following: = 115 lb/ft3, c = 1100 lb/ft2, =35, Df = 3.5 ft, B = 5 ft, and factor of safety = 4. 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17arrow_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_forward
- Redo Problem 16.13 with the following data: gross allowable load = 184,000 lb, = 121 lb/ft3, c = 0, =26, Df = 6.5 ft., and required factor of safety = 2.5. 16.13 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_forwardRedo Problem 16.2 using the modified general ultimate bearing capacity Eq. (16.31). 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17 6.2 Refer to Problem 16.1. If a square footing with dimension 2 m 2 m is used instead of the wall footing, what would be the allowable bearing capacity?arrow_forwardRedo Problem 16.3 using the modified general ultimate bearing capacity Eq. (16.31). 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17 16.3 Redo Problem 16.1 with the following: = 115 lb/ft3, c = 1100 lb/ft2, =35, Df = 3.5 ft, B = 5 ft, and factor of safety = 4.arrow_forward
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