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 7.4QPP
A column carrying a vertical downward unfactored load of 270 k is to be supported on a 3 ft deep square spread footing. The soil beneath this footing is an undrained clay with
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A 5 ft wide strip footing is placed in a clayey sand 3 ft below the ground surface. The soil has a unit weight of 112 lbf/ft3, a cohesion of 125 lbf/ft2, and an angle of internal friction of 20°. The Terzaghi bearing capacity factors are Nc = 17.7, Nq = 7.4, and Nγ = 5.0, and the factor of safety is 1. Most nearly, what is the ultimate bearing capacity for the footing?
A long footing, 1 m wide, has its base inclined 10° from the horizontal. The footing bears on the surface of a soil for which drained shear tests show a cohesion of 24 kPa and an angle of internal friction of 25°. The soil rigidity index value is 50. What load acting normal to the foundation base can be imposed if a factor of safety of 3 is used with the extended general bearing capacity equation?
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?
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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- Redo Problem 6.2 using the general bearing capacity equation [Eq. (6.28)]. A 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_forwardA 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_forwardA 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_forward
- A 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_forwarda square footing is to be constructed on a uniform thick deposit of clay with a unconfined compressive strength of 3kips/ft2. the footing will be located 5 ft below the ground surface and is designed to carry a total load of 300 kips. the unit weight of the supporting soil is 128lb/ft3. no groundwater was encountered during soil exploration. considering general shear, determine the square footing dimension, using a factor of safety of 3arrow_forwardThe square footing shown below must be designed to carry a 294 kN load. Use Nc = 57.8 ; Nq = 41.4 and N? = 41.1. a.) Using Terzaghi's capacity formula, determine the width B of the square footing with a factor of safety of 3.0arrow_forward
- i) 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_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.a. Compute the required width of the footing using a factor of safety of 2.b. Compute the ultimate bearing capacity of the soil.c. Compute the net factor of safety.arrow_forwardA column carrying a load of 750 kN is to be founded an a square footing at a depth of 2 m below the ground surface in a deep clay stratum. What will be the size of the footing it a factor of safety of 2.5 is considered? Pertinent soil parameters are saturated unit weight of 18.5 kN/m², cohesion of 30 kPa and angle of internal friction of 18 degrees. The groundwater is at the base of the footing but is expected to rise to the ground level during the rainy seasons.arrow_forward
- Consider the strip footing shown in the figure below. The soil is a clay-dominant material with f’=26° and c’=3 kPa, Su = 70 kPa and γsat = 21 kN/m3. (Assume the footing to be very long). Calculate the ultimate bearing capacity of the foundation in kPa shortly after construction using the modified bearing capacity equationarrow_forwardDefine the ultimate bearing capacity equation for the general shear failure of soil in Terzaghi's analysis for a strip footing ?arrow_forwardA long footing 2 m wide is located in the level area at the top of a long, 45° slope where clay soils exist. The slope height is greater than the footing width. The soil unit weight is 17.5 kN/m3, and the cohesion shear strength is 65 kPa. The D/B ratio is 1, and the b/B ratio is also 1. What loading can be imposed onto the footing per meter of length (using a factor of safety of 3 with the bearing capacity equation appropriate for footings along the top of slopes)?arrow_forward
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