Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 6, Problem 6.2P
A 5.0 ft wide square footing is placed at 3.0 ft depth within the ground where c′ = 200 lb/ft2, ф′ = 25°, and γ = 115.0 lb/ft3. Determine the ultimate bearing capacity of the footing using Terzaghi’s bearing capacity equation and the bearing capacity factors from Table 6.1. What is the maximum column load that can be allowed with a factor of safety of 3.0?
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3. A square footing that carries an axial load of
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a.Compute the required width of the footing using a
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b.Compute the ultimate bearing capacity of the soil.
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d.Compute the net soil pressure.
A rectangular footing with width (B) = 6 ft and length (L) = 8 ft is subjected
5b)
(P) = 75 k (shown below). The footing is 3 ft thick and flush with the ground surface. Assume x = 0.75 ft
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(eL). Is this foundation adequately sized to resist overturning (i.e., is it in full bearing or partial bearing)?
If it is in full bearing, compute the maximum and minimum pressure under the footing.
an eccentric load
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Chapter 6 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 6 - For the following cases, determine the allowable...Ch. 6 - A 5.0 ft wide square footing is placed at 3.0 ft...Ch. 6 - Prob. 6.3PCh. 6 - Redo Problem 6.2 using the general bearing...Ch. 6 - The applied load on a shallow square foundation...Ch. 6 - A 2.0 m wide continuous foundation carries a wall...Ch. 6 - Determine the maximum column load that can be...Ch. 6 - A 2.0 m wide strip foundation is placed in sand at...Ch. 6 - A column foundation (Figure P6.9) is 3 m × 2 m in...Ch. 6 - For the design of a shallow foundation, given the...
Ch. 6 - An eccentrically loaded foundation is shown in...Ch. 6 - Prob. 6.12PCh. 6 - For an eccentrically loaded continuous foundation...Ch. 6 - A 2 m 3 m spread footing placed at a depth of 2 m...Ch. 6 - Prob. 6.15PCh. 6 - A tall cylindrical silo carrying flour is to be...Ch. 6 - A 2.0 m 2.0 m square pad footing will be placed...Ch. 6 - An eccentrically loaded continuous foundation is...Ch. 6 - A square foundation is shown in Figure P6.19. Use...Ch. 6 - The shallow foundation shown in Figure 6.25...Ch. 6 - Consider a continuous foundation of width B = 1.4...
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- Redo Problem 6.2 using the general bearing capacity equation [Eq. (6.28)]. A 5.0 ft wide square footing is placed at 3.0 ft depth within the ground where c = 200 lb/ft2, = 25, and = 115.0 lb/ft3. Determine the ultimate bearing capacity of the footing using Terzaghis bearing capacity equation and the bearing capacity factors from Table 6.1. What is the maximum column load that can be allowed with a factor of safety of 3.0?arrow_forwardRefer to Problem 16.1. If a square footing with dimension 2 m 2 m is used instead of the wall footing, what would be the allowable bearing capacity? 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17arrow_forwardQuestion Attachedarrow_forward
- Problem 2 A 5ft square footing is constructed 3ft below grade. Find the ultimate bearing capacity of the footing and the maximum load that can be applied using Terzaghi's BC equation and the factors from Table 6.1. Assume c' = 200psf, D' = 25°, y = 115pcf and a FOS of 3.0.arrow_forwardA rectangular footing has dimensions shown and is acted upon by a dead load of 668.00 kN and a live load of 551.00 kN. The column dimension is 282x572 mm where the shorter dimension is parallel to B. The thickness of the footing is 564mm. f'c=28 MPa and fy=420 MPa for diameter 20mm bars. A=3.3m and B=5.7m Calculate the ratio of the Ultimate Shear Force to Shear Capacity in one- way shear. Consider critical case only. Answer is 0.6175 (Complete Solution)Aarrow_forwardA circular footing having a diameter of 2.5 m is supported by a soil (dense sand) with the following properties: O = 20° C = 50 kPa Y = 18 kN/m3 • Ysat = 20 kN/m³ %3D %3D The bottom of the footing is 1.5 m below the ground surface. GWT is located at the bottom of the footing. Using Terzaghi's equation, determine the net allowable bearing capacity with factor of safety with respect to shear failure of 3.0. Use Yw= 9.81 kN/m3.arrow_forward
- A rectangular footing has dimensions shown and is acted upon by a dead load of 1200 kN and a live load of 1600 kN. The column dimensions is 300x600 where the shorter dimension is parallel to B. The thickness of the footing is 500mm. f'c = 28 MPa and fy = 420 MPa for diameter 20mm bars. A = 2.4m and B = 4.2m Calculate the Following: A.) Critical Ultimate Shear Strength and Shear Force of the footing for beam shear action, kNB.) Critical wide beam nominal shear stress, MPaC.) Ultimate Shear Strength of the footing in punching shear action, kN Please answer it ASAP and correctly for upvotes.arrow_forwardA rectangular footing has dimensions shown and is acted upon by a dead load of 653 KN and a live load of 647 kN. The column dimension is 269x677 mm where the shorter dimension is parallel to B. The thickness of the footing is 442mm. f'c=28 MPa and fy=420 MPa for diameter 20mm bars. A=2.9m and B=4.8m Calculate the ratio of the Ultimate Shear Force to Shear Capacity in one-way shear. Consider critical case only.arrow_forwardA rectangular footing has dimensions shown and is acted upon by a dead load of 570.00 kN and a live load of 621.00 kN. The column dimension is 366x576 mm where the shorter dimension is parallel to B. The thickness of the footing is 476mm. f'c=28 MPa and fy=420 MPa for diameter 20mm bars. A=2.5m and B=4.5m Calculate the ratio of the Ultimate Shear Force to Shear Capacity in two- way shear. Answer is 0.9238 (Complete Solution)arrow_forward
- 2. A medium dense sand is proposed to support a square foundation having a width and length of 5 feet as shown below. The bottom of the footing is 2.5 feet below the ground surface. The water table is 4 feet below the bottom of the footing. Using a factor of safety of 3, what is the allowable bearing capacity of the proposed footing? Gs= 2.6 e = 0.5 Ø = 35° 5 ft d = 4 ftarrow_forwardA continuous footing with a B = 7.5ft is constructed with a Df of 3ft in a soil with the following properties: c' = 210 lb/ft? Y = 115 lb/ft³ Ø' = 25° If bedrock exists 6ft below grade use equation 7.2 to determine the ultimate bearing capacity.arrow_forwardNote: NCSP A 3.5 m square footing is proposed to be used to support a 521 mm x 376 mm RC column loaded with 675 kN dead load and 800 kN live load. The bottom of the footing is 1.9 m below the ground. Assume soil weighs 19 kN/m and the allowable soil bearing pressure is 286 kPa. The thickness of the footing is 567 mm. f' = 21 MPa and f = 420 MPa. It is to be reinforced with 20 mm diameter. Use 24 kN/m 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 (d ) What is the ratio of the Demand Shear Force and the Capacity in Two Way Shear? (Vu/phiVn) Answer: 0.9874What is the ratio of the Demand Shear Force to Capacity in One Way Shear? (Vu/phiVn) Answer: 0.4731arrow_forward
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