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 7.18QPP
A building column carries factored ultimate loads of 5,500 kN vertical and 1,200 kN horizontal. The column is founded on a 1.5 m square footing at a depth of 1.7 m. The soil is a cohesionless sand with
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A strip footing 2.5 m wide is to be constructed at a depth of 3m below ground level. The shear strength parameters to be used in design being c|= 65kN/m2 and ø| = 34°.
The unit weight of the soil above water table is 18kN/m3 , and below the water table the saturated unit weight is 20kN/m3.
a. If the water table is well below foundation level
b. If the water table is at the surface.
A circular footing is to carry the load given. The foundation shall be embedded at a depth of 2.2 m below ground level (GL). The groundwater table was observed 2 m below BOF. Using the following soil data (dense sand):
γsoil = 18 kN/m3
γsub = 10 kN/m3
c = 12 kPa
Nc = 17.69
Nq = 7.44
Nγ = 3.64
FS = 3.0
If the total service load to be carried concentrically is 520 kN, what should be the radius of the circular footing (m)?
the final ans is 0.91
A 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)?
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 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_forward
- A strip footing is to be designed to carry a load of 800 kN/m at the depth of 7m in a gravelly sand . the appropriate shear strenght parameter are c =0 and φ=40o. Determine the width of the footing if a factor of safety 3 against shear failure is specified and assuming that that the water table may raise to foundation level.Above the water table the unit weight of the sand is 17 kn/m3 and below the water table the saturated unit weight is 20 kN/m3arrow_forwardA square footing has a dimension of 1.30m. Its bottom is 1.5m below the ground surface. The groundwater table is expected to exist during the life of the structure. The unit weight of soil above the water table is 17.20 kN/m³ and that below the water table is 19.60 kN/m3 (saturated). Angle of internal friction is 20 degrees and cohesion is 15 kPa. Using general shear failure and a factor of safety of 3.0. Calculate the following a. Gross allowable bearing capacity if the water table is 4m from the ground surface b. Gross allowable bearing capacity if the water table is 2m from the ground surface c. Gross allowable bearing capacity if the water table is at the embedment of the foundation d. Gross allowable bearing capacity if the water table is 1.0m from the ground surfacearrow_forwardA footing 2.25 x 2.25 m is located at a depth of 1.5 m in a sand, the shear strength parameters to be used in design being d' = 0 and o' = 38°. Determine the ultimate bearing capacity (a) if the water table is well below foundation level and (b) if the water table is at the surface. The unit weight of the sand above the water table is 18 kN/m³; the saturated unit weight is 20 kN/m³.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_forwardQuestion 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).arrow_forwardA rectangular footing 3m by 4m is founded 1.2m below the ground surface for which the unit weight of soil is 17.8kN/m3. The cohesion strength is 10kPa and the angle of internal friction is 20degrees. Under the condition of general failure, evaluate the contribution from the following to the ultimate soil bearing capacity in kPa. The ground water table is at a level that does not affect the unit weight of the soil. Use Terzaghi’s bearing capacity factor. For Ø=20degrees: Nc = 17.69, Nq = 7.44, Ny = 3.64. 23. Due to Cohesion Strength Due to soil overburden Due to footing dimensionarrow_forward
- help me pleasearrow_forwardA circular footing with a 1.22-m diameter is to be constructed 1.07 m below the ground surface. The subsoil consists of a uniform deposit of dense soil having a unit weight of 21.33 kN/m 3, an angle of internal friction of 20° and a cohesion of 57.6 kN/m 2. The groundwater table is at a great depth, and its effect can be ignored. Determine the safe total load (including column load and weight of footing and soil surcharge), using a factor of safety of 3.arrow_forward(a) Determine the wall loading that can be carried by a long footing 1 m wide and located 1.5 m below the ground surface. Strength tests indicate that the soil has a cohesion of 58 kN/m2 and an angle of internal friction of20°. The total soil unit weight is 18 kN/m3. The soil above the footing is well compacted, and the depth factors will apply. The soil rigidity index is greater than the critical index. The water table is expected to rise to the ground surface. Use a factor of safety equal to 3 with the extended general bearing capacity equation.(b) Recalculate the design bearing capacity assuming the depth factors do not apply. What percentage change in bearing capacity does this represent (compared to the answer in part a)?(c) Recalculate the bearing capacity for the conditions of part a but where the water table is very deep.arrow_forward
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