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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Textbook Question
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 certain column carries a vertical downward load of 1350 kN. It is to be supported on a 1.0 m deep, square footing. The soil beneath this footing has the following properties: y = 20.8 kN/m³, c'=4.7 kPa, '=31⁰. The
groundwater table is at a depth of 1.5 m below the ground surface. Using ASD, compute the footing width required for a factor of safety of 3.5 using Terzaghi's method.
Solution:
1. Determination of the method:
According to the given information, the best suitable method would be Tergaghi's mehod.
2. Determination of bearing capacity factors - function of ':
a. Nc =
b. Nq
=
c. Ny=
3. Determination of other bearing capacity factors: (B stards for the width of the footing)
Surcharge stress at depth D: OD
Allowable bearing pressure qa =
=
Effect of GWT on submerged unit weight: y'
4. Calculate ultimate bearing pressre using the Tergaghi's method:
Ultimate bearing pressure qult =
в кра;
Bearing pressure due to loading q =
5. Figure out the width B by setting q ≤ qa:
Calculated…
A footing is embedded to a site of sandy clay at a depth of 1.6m below the natural grade line (NGL). The soil has the following properties: cohesion is 10kPa,
angle of internal friction is 35 deg, the specific gravity of the soil solids is 2.75, void ratio is 0.55 and the water content is 5%. The water table is at a great depth.
Consider Terzaghi's general shear failure and a factor of safety 3.5.
Determine the bearing capacity factor for cohesion in a general shear failure condition.
Select the correct response:
46.1236
33.2960
48.0287
10.6884
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.
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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- Refer 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_forwardA column carrying a vertical downward ultimate factored load of 1,500 kN is to be supportedon a 1 m deep square spread footing. The soil beneath this footing is an undrained clay withsu = 150 kPa and g = 18.1 kN/m3 . The groundwater table is below the bottom of the footing.Using the LRFD method, compute the required width B. Assume the geotechnical resistancefactor is 0.5.arrow_forward
- A square footing having the dimension of 24 x24 (B=L=24) is to beconstructed on a deep clay deposit. Superstructural stress is calculated as 150 kPa. Thefoundation will rest at the depth of 2 m from the surface. The groundwater table is located onthe surface and the saturated unit weight of the clay is 17 kN/m3. Determine the depth of theborehole considering both de Beer’s rule and the Turkish Earthquake Code (2018).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_forwardSubject: Geotechnical engineering Please give me right solution according to the question.. urgentarrow_forward
- A square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa. Capaarrow_forwardA square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa.arrow_forwardQuestion 3. A strip footing is to be used in a clay soil in which the imposed load is 1 MN/m length. The clay layer is 7.0 m thick and overlies a stiff, fractured siltstone. The water table lies at a depth of 2.0 m. a. Determine the footing width based on the long-term allowable bearing capacity (calculated according to the method in the Canadian Foundation Engineering Manual; neglect depth factors) using a factor of safety of 3.0 for a burial depth of 2.0 m. The material properties of the clay are: c' = 15 E = 42 MPa o' = 27° y= 18.5 kN/m³ Ce = 0.40 e, = 0.90 C, = 9.3 x 104m²/day Cu = 25 b. Why would bearing capacity failure likely not govern the design of this structure?arrow_forward
- Two footings, one circular and the other strip, are founded on the surface of a purely Cohesionless soil. Diameter of the circular footing and width of strip footing is same. Then, the ratio of ultimate bearing capacity of circular to strip footing is:arrow_forwardComplete answerarrow_forwardSOLVE USING CSA REQUIREMENTS PLSarrow_forward
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