EBK FOUNDATION DESIGN
3rd Edition
ISBN: 9780133424478
Author: CODUTO
Publisher: YUZU
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Chapter 7, Problem 7.15QPP
A certain column carries a vertical downward load of 1,200 kN. It is to be supported on a 1 m deep, square footing. The soil beneath this footing has the following properties:
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A 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 dimension
A 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…
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.
Chapter 7 Solutions
EBK FOUNDATION DESIGN
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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- (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 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_forwardA rectangular footing has dimensions shown and is acted upon by a dead load of 382 kN and a live load of 536 kN. The column dimension is 307x560 mm where the shorter dimension is parallel to B. The thickness of the footing is 656mm. fc=28 MPa and fy=420 MPa for diameter 20mm bars. A=2.6m and B=5.2marrow_forward
- A square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa.arrow_forwardA square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa. Capaarrow_forward0:YA O A comprehensive.. Example (1): A strip footing of width 3 m is founded at a depth of 2 m below the ground surface in a (c - 0) soil having a cohesion c = 30 kN/m? and angle of shearing resistance o = 35°. The water table is at a depth of 5 m below ground level. The moist weight of soil above the water table is 17.25 kN/m. Determine (a) the ultimate bearing capacity of the soil, (b) the net bearing capacity, and (c) the net allowable bearing pressure and the load/m for a factor of safety of 3. Use the general shear failure theory of Terzaghi. Example (2): If the soil in Ex. (1) fails by local shear failure, determine the net safe bearing pressure. All the other data given in Ex. (1) remain the same. Example (3): If the water table in Ex. (1) rises to the ground level, determine the net safe bearing pressure of the footing. All the other data given in Ex. (1) remain the same. Assume the saturated unit weight of the soil ya= 18.5 kN/m'. Example (4): If the water table in Ex.1…arrow_forward
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