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 7.8QPP
A 5 ft wide, 8 ft long, 2 ft deep spread footing is underlain by a soil with
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A continuous footing installed at a depth of 3 feet with base of 4 feet wide is constructed on cohesionless
soil with a unit weight of 125 lb/ft³ and an angle of internal friction of 31°. The factor of safety
requirement for the design is 2. The water table is sufficiently below
the base of the foundation that won't interfere with the design.
Determine:
1. Allowable bearing capacity (qa)
2. Allowable wall load in lb/ft.
Plb
B
A 5 ft wide, 8 ft long, 2 ft deep spread footing is underlain by a soil with c′ = 200 lb/ft2,
f′ = 37°, and g = 121 lb/ft3
. The groundwater table is at a great depth. Using LRFD with aresistance factor of 0.5, determine the ultimate factored load this footing can carry.
4. A subsurface exploration is conducted and it is discovered that the subsurface soils are primarily
stiff sandy clays. Given the spacing of some of the columns it is decided that strip footings would best
support them. The proposed footing configuration is shown below. Detemine the ultimate loads that
can be supported by the footing shown if it is founded at a depth of 3.5 feet below the ground surface.
The groundwater was found to be at a depth of 10 ft below the ground surface. Assume the rectangular
foundation is rigid and that the loads from both columns are uniformly supported by the footing. Use
a factor of safety of 4.
15 ft
2.5 ft
2.5 ft
5 ft
10 ft
PLAN
Qult
Qult
ELEVATION
3.5 ft
14 in
C =
300 lb/ft?
10 ft
y = 118.6 lb/ft³
Ø = 15°
c = 300 lb/ft²
Ysat = 126.6 lb/ft³
Ø = 15°
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 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_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 1.4-m wide, 2.5-m long, 0.5-m deep spread footing is underlain by a soil with c' = 10.0 kPa, ' = 35.0°, y = 18.4 kN/m³. The groundwater table is at a great depth. Using ASD compute the maximum unfactored load this footing can support while maintaining a factor of safety of 2.5 against a bearing capacity failure. Solution: 1. Determination of the method: According to the given information, the best suitable method would be 2. Determination of bearing capacity factors - function of ': a. Nc = b. Nq = c. Ny 3. Determination of other bearing capacity factors: 3.1 Shape factors: a. Sc = = b. Sq c. Sy = 3.2 Depth factors: k = a. de b. dq || = c. dy = 3.3 Inclination factors: All inclination factors = 3.4 Surcharge stress at depth D: a. O'D 4. Using the proper method to estimate the capacity and load: kPa; = a. qult = kPa; b. Ultimate load the footing can support is Pult = c. Maximum unfactored load this footing can support is Pa kN; kN; ◆ mehod.arrow_forward
- A rectangular combined footing 8 ft * 20 ft is founded at a depth of 6 ft on a normally con-solidated sand deposit. The sand deposit is approximately 28 ft thick and overlies sandstone. CPT tests indicate the sand is relatively uniform below the proposed footing depth and theaverage tip resistance is 50 tsf. The total service load carried by the combined footing is480 k. Estimate the settlement of this footing.arrow_forwardA square footing (10' x 10') is located 6' below grade. The lowest corrected N value (blow s count) is 40 and groundwater was not encountered. If the maximum allowable settlement is 1", determine the maximum allowable soil pressure.arrow_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
- 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_forwardAnswer asap for upvote. A 1.4 m wide footing is embedded 2.35m beneath the ground surface. The investigation indicated a unit weight equal to 18.23 kN/m3. The cohesion is 15.7 kPa. The saturated unit weight of the soil is 19.10 kN/m3 Determine the net allowable load (kN) that can be carried by the footing if the groundwater table is 0.54m below the footing. Assume footing is a circle Terzaghi's Bearing Capacity A soil report for an undisclosed location summarizes the parameters for the ground strata below: Angle of internal friction, Φ = 34 degrees Factor of safety on bearing capacity = 3arrow_forwardA certain column carries a vertical downward load of 448.0 k. It is to be supported on a 3.0-ft deep rectangular footing. Because of a nearby property line, this footing may be no more than 5.0 ft wide. The soil beneath this footing is a silty sand with the following properties: y = 122.4 lb/ft³, c'=50.0 lb/ft², p=34.0°. The groundwater table is at a depth of 6.0 ft below the ground surface. Using ASD to compute the footing length required for a factor of safety of 3.0. Solution: 1. Determination of the method: According to the given information, the best suitable method would be Surcharge stress OD y' = = b. Sq 2. Determination of bearing capacity factors - function of ': a. Nc = b. Nq = c. Ny = 3. Determination of other bearing capacity factors: 3.1 Shape factors: a. Sc = pcf. = a. dc = c. Sy 3.2 Depth factors: k = + = + = /L; b. dq c. dy 3.3 Inclination factors: All inclination factors = /L; psf /L; 3.4 Surcharge stress at depth D: a. O'zD psf; mehod.arrow_forward
- The underlying soil is a well-graded sand with c′ = 0, f′ = 36°, g = 126 lb/ft3, with a verydeep groundwater table. Using LRFD, design a rectangular footing to meet the ultimate limitstates using a resistance factor of 0.45. Assuming the average CPT tip resistance of the sand is300 kg/cm2, check to see if your design meets serviceability limits. Adjust the design as needed.arrow_forward7. 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_forward1. A 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below grade. The column bearing on this footing will impose a load of 180kips. Assuming the subsurface conditions shown below with groundwater 5ft below grade, Use Schmertman's method to calculate the elastic settlement of the system 6 years after construction is completed, provide a clear sketch and show units and state assumptions. Oft Sand Ymoist = 120 pcf Phi = 30deg Es = 52 ksf 4ft Loose Sand 5ft Ymoist = 125 pcf Yat = 145 pcf Phi = 22deg Es (above GW) = 30 ksf Es (below GW) = 20 ksf 8ft Dense Sand Ysat = 155 pcf Phi = 35deg Es = 60 ksf 20ft 2. The foundation above is limited to a 1.5" settlement after 10 years, speak to whether the design is adequate and if not how can you adjust the project to meet this criteria.arrow_forward
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