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 7.17QPP
A 3 ft square footing is founded at a depth of 2.5 ft on saturated clay and carries an unfactored vertical column load of 65 k. The underlying clay has an undrained shear strength of
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Students have asked these similar questions
A 3m diameter circular footing is transmitting a concentrated load of 1500KN.
A). Determine the bearing pressure exerted by this footing into the supporting soil.
B). Determine the increase in the vertical stress at a depth of 3m directly below the
center of the footing.
C). Determine the increase in the vertical stress at a depth of 6m which is located at 2m
radially from the center of the footing.
A 2m x 3m footing constructed on a sand deposit (as shown in the Figure below)
is subjected to centric vertical loading at a depth of 1.5m below the ground surface.
Energy-corrected SPT Noo values from the field are given below. Assume c' = 0, y
= 18.5 kN/m, Vat = 19.5 kN/m,
%3D
Assuming Factor of Safety = 3, compare the gross allowable load for the following
scenarios.
(a) When the ground water table is located at the ground surface.
(b) When the ground water table is located 0.5 m below the ground surface.
(c) When the ground water table is located at the base of the footing.
(d) When the ground water table is located 1m below the base of the footing.
(e) When the ground water table is located 5 m below the base of the footing.
Ground water
D
able
Casel
D
Casell
Yaturated
unit weight
Depth (m)
Neo
1.5
3.0
4.5
6.0
10
7.5
10
9.0
Question 3
A continuous concrete footing (yc = 24 kN/m³) of breadth 2.0 m and thickness 0.5 m is
to be founded in a clay soil (cu = 22 kPa; y = 19 kN/m³) at a depth of 1.0 m. The footing
will carry an applied vertical load of magnitude 85 kN/m run. The load will act on the
centre line of the footing. Apply a factor of safety of 1.35 to the permanent action (dead
load) and a factor of safety of 1 to the soil material properties and bearing resistance.
Verify the bearing resistance limit state under undrained conditions. Is the width
appropriate? (Yes- FOS>1).
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- A flexible circular footing of radius R carries a uniform pressure q. Find the depth (in terms of R) at which the vertical stress below the center is 20% of q.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 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_forward
- 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_forwardTwo meters below the ground surface, a 2x2 m square footing is constructed on NC clayey sand. The layer is subjected to a CPT test, with the results revealing an average cone resistance of 20 Mpa. A layer of hard rock is laid 20 meters below the surface. The service load of 25 ton.f is acting on the footing column. Find the elastic settlement using the generalized elastic method. The water level is at the surface and you can use w 10 KN/m3. (footing weight is negligible) H Hint: use table 4.8 of textbook to find the undrained modulus. TABLE 4.8 ESTIMATING EQUIVALENT SOIL MODULUS, ES, VALUES FROM CPT RESULTS [Adapted from Schmertmann et al. (1978), Robertson and Campanella (1989), and other sources.] Soil Type USCS Group Symbol Young, normally consolidated clean silica sands (age 3,000 years) Overconsolidated clean silica sands Normally consolidated silty or clayey sands Overconsolidated silty or clayey sands SW or SP SW or SP SW or SP SM or SC SM or SC Esla 2.5-3.5 3.5-6.0 6.0-10.0…arrow_forwardA 1mx1m square concrete footing carrying a vertical load of 500KN founded on fully saturated clay. Which of the following statement is correct? a. The contact pressure between the footing and the clay is 50 kPa. Ob. The contact pressure between the footing and the clay is 500 kPa O c. The vertical induced stress at 1m depth below the centre of the footing in the clay is more than 500 kPa. Od. The vertical stress increase at 1m depth below the centre of the footing in the clay is 50kPa.arrow_forward
- A proposed industrial building will carry unfactored column loads ranging from 280 to 1,200kN and service loads from 230 to 950 kN. The allowable settlements are da = 30 mm anddDa = 12 mm. It is supported on a cohesionless sand with f′ = 35° and g = 19.2 kN/m3. Footings at this site will be at a depth of 2.2 m and the groundwater table is at 5 m. A dilatom-eter test run at the site has returned the following modulus profile: Depth (m) 2 3 4 5 6 7 8 9 10 11 12 13M (MPa) 18.3 20.6 19.0 21.1 35.2 40.0 37.3 30.1 31.9 40.0 40.8 42.0arrow_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_forwardinitial void ratio, e0 = 1.2375 undrained shear strength, Cu = 450 pcfarrow_forward
- A 5 ft wide, 8 ft long, 3 ft deep footing supports a downward load of 200 k and a horizontalshear load of 25 k. The shear load acts parallel to the 8 ft dimension. The underlying soils havec′ = 220 lb/ft2 , f′ = 28°, and g = 123 lb/ft3 . Using an effective stress analysis, compute the factor of safety against a bearing capacity failure. .arrow_forwardA long strip footing 3.5 ft wide is to be used to support a masonry bearing wall for a building. The subsurface investigation indicates that the soil at the site is a clay with a unit weight of 110 pcf and a cohesion, c, of 1,200 psf. The angle of internal friction is zero. The clay has a rigidity index of 10. The foundation is constructed 3 ft below the ground surface, and the soil backfill is well compacted. Using a factor of safety of 3, what maximum load should the foundation be designed to support per foot of wall length?arrow_forwardA 3 ft x 3 ft square footing is to be placed over the following soil profile to support 18-kips column load. Determine if the clay is normally consolidated or over- consolidated. The pre-consolidation pressure (past maximum consolidation stress) of the clay is 600 lb/ft³. 2 ft 4 ft Sand Clay Rock 18 kips 2 ft Square foundation: 3 ft x 3 ft Ydry 100 lb/ft³ Ground water table Ysat = 110 lb/ft³ o'= Pc = 600 lb/ft²arrow_forward
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