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 7.20QPP
A certain column carries a vertical downward load of 424 k. It is to be supported on a 3 ft deep rectangular footing. Because of a nearby property line, this footing may be no more than 5 ft wide. The soil beneath this footing is a silty sand with the following properties:
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A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: Ydry = 115.0 pcf $'=24° c'= 90.0 psf Cc/(1+eo) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. What is the maximum bending moment from the earthquake that this foundation can support? Consider bending moment only about one axis.
A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also
3 feet) spread footing. The normally consolidated clay has the following engineering properties:
Ydry = 115.0 pcf
$'=24°
c'=90.0 psf
Cc/(1+eo) = 0.15
The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground
surface.
Using the classical piece-wise log-linear method, estimate the total settlement of this footing
considering only the allowable bearing pressures using ASD approach. The unit weight of
concrete is 150 pcf. State any assumptions made.
A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also3 feet) spread footing. The normally consolidated clay has the following engineering properties:γdry = 115.0 pcfφ’=24°c’= 90.0 psfCc/(1+e0) = 0.15The soil stratum extends to a great depth, and the ground water table is 50 ft below the groundsurface.a) Using the classical piece-wise log-linear method, estimate the total settlement of thisfooting considering only the allowable bearing pressures using ASD approach. The unitweight of concrete is 150 pcf. State any assumptions made.b) What is the maximum bending moment from the earthquake that this foundation cansupport? Consider bending moment only about one axis.c) In the case of your estimated maximum bending moment, what would be the totalsettlement?
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 certain column carries a vertical downward load of 424 k. It is to be supported on a 3 ftdeep rectangular footing. Because of a nearby property line, this footing may be no morethan 5 ft wide. The soil beneath this footing is a silty sand with the following properties:g = 124 lb/ft3 , c′ = 50 lb/ft2 , and f′ = 34°. The groundwater table is at a depth of 6 ft belowthe ground surface. Use ASD and the spreadsheet developed in Problem 7.19 to compute thefooting length required for a factor of safety of 3.0.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 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, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardThe width and depth of a footing are 2 and 1.5 m respectively. The water table at the site is at a depth of 3 m below the ground level. The water table correction factor for the calculation of the bearing capacity of soil isarrow_forwardA (4m x 5m) rectangular footing was supported bya saturated clay layer with a thickness of 5m. If the second layer (below the clay) was a saturated sand. The settlement that could be occurred in this site: a. None of the given answers are correct b. Is only long term settlement C. Is a short term settlement O d. Is only consolidation settlementarrow_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 eccentric footing shown has the following loads which acts on the center of the column: Pdl=400 kN Pll=650 kN Thickness of footing is 400mm f'c= 29 MPa; fy =420 MPa db=20mm Calculate the following: 1. The minimum and maximum soil pressure due to service loads 2. The minimum and maximum soil pressure due to factored loadsarrow_forwardA 3 m * 3 m footing is to be built on the surface of a 15 m thick layer of unsaturated sand.The sand is underlain by a very dense gravel layer. The water table is at a great depth. The sandis relatively uniform and in situ testing indicates it has a constrained modulus of 10 MPa. Thefooting load is 200 kN. Compute the settlement under the center of the footing.arrow_forward
- 7. A continuous strip footing bears on sand with groundwater one-half the footing width below the base of the footing. Which of the following changes will Increase the allowable bearing pressure? D B/2 PFT B SAND A) Embedment depth remains D, but the footing width is decreased. B) Embedment depth remains D, but the groundwater is raised to B/4 below the base of the footing. C) Embedment depth and groundwater remain D and B/2, but the unit weight of the sand is increased. D) Groundwater remains at B/2 below the base of the footing, but the embedment depth is decreased.arrow_forwardA structural engineer finished a design of a library. They determine that each column will carry 1000 lbs. the soil beneath the footing has the properties: gamma= 130 pcf, c= 75psf, phi= 40 degrees. The groundwater table is of great depth so it’s no concern. Sketch figures. What is the minimum size of the footing for a factor of safety of 3? Case 1: assume square footing Case 2: assume round footingarrow_forwardThe net ultimate bearing capacity of a purely cohesive soil A. Depends on the width of the footing and is independent of the depth of the footing B. Depends on the width as well as the depth of the footing C. Depends on the depth, but is independent of the width, of the footing D. Is independent of both the width and the depth of the footingarrow_forward
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