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 7.7QPP
A 1.5 m wide, 2.5 m long, 0.5 m deep spread footing is underlain by a soil -
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A 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.
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
i) A strip footing of width B=1m is embedded 0.6m in soil. The soil has unit weight equal to
19kN/m3
and a critical-state friction angle Øc of 32o
. Assume water table to be deep, what is the
ultimate bearing capacity of the soil?
ii) A square footing is to be constructed on a deep deposit of sand at a depth of 0.9 m to carry a
design load of 300 kN with a factor of safety of 2.5. The ground water table may rise to the ground level during rainy season. Design the plan dimension of footing given γsat =
20.8 kN/m3
, Nc = 25, Nq = 34 and Nγ =32.
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 rectangular footing 13'x14' supports a rectangular column 12" x 24", with DL = 340 kips and LL = 180 kips. The allowable soil pressure is 2.5 ksf. Determine the total soil pressure and indicate if the footing size is appropriate O 2.9ksf, YES O 3.1ksf. YES O 3.1ksf, NO O 3.8ksf, NOarrow_forward(5) There is a strip footing with a width of 2 m and a buried depth of 1.5 m. The foundation soil is silt with a unit weight of 19 kN/m', a saturated unit weight of 20 kN/m², cohesion of 10 kPa, and an internal friction angle of 20°. The groundwater level is I m below the ground surface. Please determine the ultimate bearing capacity of the foundation. (arrow_forwardA certain column carries a vertical downward load of 1350 kN. It is to be supported on a 1.0 m deep, square footing. The soil beneath this footing has the following properties: y = 20.8 kN/m³, c'=4.7 kPa, '=31⁰. The groundwater table is at a depth of 1.5 m below the ground surface. Using ASD, compute the footing width required for a factor of safety of 3.5 using Terzaghi's method. Solution: 1. Determination of the method: According to the given information, the best suitable method would be Tergaghi's mehod. 2. Determination of bearing capacity factors - function of ': a. Nc = b. Nq = c. Ny= 3. Determination of other bearing capacity factors: (B stards for the width of the footing) Surcharge stress at depth D: OD Allowable bearing pressure qa = = Effect of GWT on submerged unit weight: y' 4. Calculate ultimate bearing pressre using the Tergaghi's method: Ultimate bearing pressure qult = в кра; Bearing pressure due to loading q = 5. Figure out the width B by setting q ≤ qa: Calculated…arrow_forward
- Complete answerarrow_forwardA 3.2 m square footing is proposed to be used to support a 373 mm x 605 mm RC column loaded with 637 kN dead load and 856 kN live load. The bottom of the footing is 1.7 m below the ground. Assume soil weighs 19 kN/m3 and the allowable soil bearing pressure is 343 kPa. The thickness of the footing is 464 mm. fc = 21 MPa and fy = 420 MPa. It is to be reinforced with 20 mm diameter. Use 24 kN/m³ as the unit weight of concrete. Note: For two-way shear, use an effective depth measured from the top of the footing until the top of the bottom-most bar (d3) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn) Answer in 4 decimal places (1.6125, 1.5140, 0.8461, etc.) You Answered Correct Answer 1.3809 margin of error +/- 1%arrow_forwardAn isolated footing having dimensions of 1.5m x 2.2m is provided at a depth of 1.2m in a stratum of cohesionless soil having a relative density of 71%. Determine the bearing capacity factors Nc, Nq and Nγ as per IS code.arrow_forward
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