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 8, Problem 8.2QPP
A 250-k column load is to be supported on a 9 ft square footing embedded 2 ft below the ground surface. The underlying soil is a silty sand with an average
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Students have asked these similar questions
Figure (a) shows the cross section of square footing of 3 m x 3 m. The soil
properties are shown in the figure.
i)
ii)
Determine the load Q that the footing can carry. Use the factor of safety (FOS)
of 2.5.
During rainy season, groundwater level increased to the soil surface. Based on
this condition, calculate the new FOS and justify whether the existing footing is
able to carry the same amount of load as calculated in (a)
Not drawn to scale
1.6 m
0.4 m
Water level
3m
Q
Soil properties
Yd=18.3K³
Ysat = 21 kN/m³
= 30°
A plate-load test was
conducted on-site in Cavite in
which the soil was found to be
clay. PLT was conducted using a
circular plate having a diameter
of 557 mm. The ultimate load
for the test was found to be
554 kN/m2. What should be
the maximum allowable load of
a footing having a diameter of
2.25 m? Use an FS of 3.98.
Following are the results obtained from a plate load test performed on a square plate of
30 cm x 30 cm size at a depth of 1.5 m below as, in a homogeneous sand bed. Determine ultimate
load which a footing of size 2 mx 2 m placed at 1.5 m below G.L. of the same soil, if allowable
settlement is 15 mm.
Settlement, mm
0
10
20
30
40
50
60
50
100
Load, kN/m²
150
200
250 300
350
400
Chapter 8 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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- 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_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 3 ft square footing carries a sustained load of 10 k. It is placed on the surface of a 30 ft thicksaturated overconsolidated clay underlain by dense sand. Based on laboratory tests, the clay can be adequately modeled using the e@log@p method. The laboratory tests provide the follow-ing compressibility information for the clay: g = 123 lb/ft3Cc1 + e0= 0.06Cr1 + e0= 0.002sm′ = 900 lb/ft2 The groundwater table is located at the ground surface. Compute the settlement of the footing.arrow_forward
- A 1.8 m square, 2 m deep footing supports a service load of 570 kN. It is supported on a clayey sand. A dilatometer test run at the site has returned the following modulus profile. Compute the footing settlement.arrow_forwardQ- A 2 mx 4 m rectangular footing has to carry a uniformly distributed load of 120 kPa. As per the 2:1 dispersion method of stress distribution, the increment in vertical stress (in kPa) at a depth of 2 m below the footing isarrow_forwardA plate load test was carried out on a ground having a uniform sand stratum upto sufficient depth. The size of the plate used was 40 cm x 40 cm. Load (kN) 10 20 30 40 50 Settlement (mm) 2 3.5 5.5 7.5 10.5 Calculate load that can be taken by a column footing of size 3.5 m x 3.5 m in this soil, for an allowable settlement of 1.95 cmarrow_forward
- a 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_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_forward2- Determine the stress increase below the center of the footing using both theoretical and approximate methods at the top, middle and bottom of the clay layer. In addition, determine the average stress increase for the clay layer. Dimensions in Heights in m Unit weights in kN/m3 kN m P2 H1 H2 H3 BL Hw 2.5 Yoati 18.0 19.0 3.0 3.0 2.0 16.0 2 3 1174 Load - 0 Hw H1 H2 H3 OSand Clay (hoemally conactiduted)arrow_forward
- A strip footing carries a load 14506 lbs per foot of length. The footing has a width of 2.3 ft. Determine the increase in vertical stress directly below the center of the footing at a depth of 0.8 ft. Provide your answer in psf, to 2 decimal place. Do not include units in your response.arrow_forwardA 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.arrow_forwardA 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.arrow_forward
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