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 11, Problem 11.2P
Repeat Problem 11.1 based on limit state design, using the factors given in Table 11.4.
11.1 A continuous foundation is required in a soil where
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Students have asked these similar questions
A column foundation is 3 m × 2 m in plan. Given: Dƒ = 1.5 m, þ' = 30°, c′ = 80 kN/m².
Using the general bearing capacity equation (CFEM see class slides from March 17
similar to Example 1 and 2 but with an added capacity term related to cohesion) and
0.5, determine the factored bearing capacity of the foundation (i.e. – use Þ). Use Yw =
9.81 kN/m³. For simplicity, read the values of Nc, Ną, and Ny directly from the table on page
26 of the lecture slides use the highlighted columns. Also, determine the maximum
factored load for the column.
-
1.5 m
↑
1 m
3m x 2m
-
y = 17 kN/m³
Groundwater level
Ysat =
19.5 kN/m³
=
A continuous foundation is required in a soil where c' =
10 kN/m², o' = 26°, and y = 19.0 kN/m³. The depth of
the footing will be 1.0 m. The dead load and the live load
are 600 kN/m and 400 kN/m, respectively. Determine the
required width for the foundation based on allowable stress
design with FS = 3, using Eq. (6.10) and Table 6.1.
%3D
the
A 1.70 m by 2.60 m footing has its base 1.70 m below the ground surface. GWT is a meter above
its base. (L along x-axis)
Y = 15.75 kN/m
C= 15 kPa
Yut = 19 kN/m
=26°
Using Meyerhof's formula, determine the net ultimate load that the footing could carry if e = 0.45
m and es = 0.30 m.
PLEASE MAKE YOUR HANDWRITING
READABLE AND CLEAR. THANK YOU SO
MUCH :)
Chapter 11 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A 2.0 m wide continuous foundation carries a wall load of 350 kN/m in a clayey soil where = 19.0 kN/m3, c = 5.0 kN/m2, and = 23. The foundation depth is 1.5 m. Determine the factor of safety of this foundation using Eq. (6.28).arrow_forwardConsider a continuous foundation of width B = 1.4 m on a sand deposit with c = 0, = 38, and = 17.5 kN/m3. The foundation is subjected to an eccentrically inclined load (see Figure 6.33). Given: load eccentricity e = 0.15 m, Df = 1 m, and load inclination = 18. Estimate the failure load Qu(ei) per unit length of the foundation a. for a partially compensated type of loading [Eq. (6.89)] b. for a reinforced type of loading [Eq. (6.90)]arrow_forward2. 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_forward
- Problem.№₂3 - The plan of a mat foundation is shown in Figure. Calculate the soil pressure at points A, B, C, D, E, and F. (Note: All column sections are planned to be 0.5 m 3 0.5 m.) All loads shown are factored loads according to ACI 381-11 (2011). 550 KN 2000 KN 5.25 m 2000 KN 550 kN F *K 0.25 m G H 10 m ! B i 660 kN 2000 KN 10 m 2000 KN 660 kN E 600 KN 1600 KN 5.25 m 10 m 1600 KN 470 kN C D *K 0.25 m 9 m 9 m 9 m 0.25 m 0.25 marrow_forwardQUESTION 1 1. a) A 7.5 ft wide rough continuous foundation is placed in the ground at 3.0 ft depth. Bedrock is 3 ft depth below the bottom of the foundation. Soil properties: c' = 210 lb/ft², = 25%, y = 115.0 lb/ft³ What is the ultimate bearing capacity of the foundation? b) What is ultimate bearing capacity assuming there is no bedrock present for at least 12.0 ft below the foundation?arrow_forwardIt is planned to construct a rectangular foundation with base dimensions of 8 * 14 m (B* L) on the construction site with the ground profile as in the figure. Accordingly, if the YASS descends 9 m, what would be the change in the final bearing capacity of the ground? Note: Make your calculation using the Terzaghi bearing capacity formula as the safety factor of 3 0m c=18 kPa, -18° Y=20 kN/m³ Y-21,8 kN/m³ 1.5 m SM H e=0.67 2.7 m GW 12 m c=8 kPa, -23° e=0.23 Yo=22 kN/m³ Y-23,2 kN/m³arrow_forward
- A square shallow foundation (B × B) is planned to be constructed on a normality consolidated (NC) clay soil as shown in the below figure. The maximum acceptable settlement for the foundation is equal to 2.0 inches (5 cm), and the safety factor against bearing capacity is FS = 4. Determine the size of foundation. (Note: To simplify the calculations, ignore both the elastic settlement and secondary compression settlement. Also consider 4o'ave = 40'm) Q = 500 kN Ysat = 19.24 kN/m³ en = 0.8 C. = 0.25 p'= 0 c'= 25 kPa 2 m B ×B FS again Bearing Capacity = 4 Acceptable settlement = 2.0 inches 10 marrow_forwardA strip footing is to be designed to support a dead load of 500 kN/m and an imposed load of 300 kN/m at a depth of 0.7 m in a gravelly sand. Characteristic values of the shear strength parameters are c' = 0 and ϕ' =40˚. (a) Determine the required width of the footing if a factor of safety of 3.0 and assuming that the water table may rise to foundation level. (b) Would a foundation of that width satisfy the bearing resistance limit state? The unit weight of the sand above the water table is 17 kN/m3 and below the water table the saturated unit weight is 20 kN/m3.arrow_forwardA spread-footed foundation has top area dimensions of 3 m by 1.5 m. The vertical depth (h) of the foundation is 0.70 m. Only the width at the bottom is longer than the top, i.e. the 3-m length is constant. The angle of spread of footing (θ) is 25°. Calculate the volume of this foundation in cubic meters.arrow_forward
- (a) Design a Shallow Foundation to support a dead load of 500 kN/m and an imposed load of 300 kN/m in a silty sand. Characteristic values of shear strength parameters are c|= 10 kN/m2 and ø| = 40°. The saturated unit weight of the soil is 20 kN/m3 and the unit weight above the water table is 17 kN/m3 . (a) determine the required size, shape and depth of the footing if a lumped factor of safety of 3.0 against shear failure is specified and assuming that the water table (i) is well below the foundation level (ii) may rise to foundation level (iii) may rise to the surface (b) determine if a foundation of that size, shape and depth would satisfy the bearing resistance limit state?arrow_forwardA foundation is 3 mx 2 m in plan. Given: Df= 1.5 m, o'= 25°, c'= 70 kN/m². With General Bearing Capacity equation and FS = 3 assmuming general shear failure in soil, determine the net allowable load that the footing can carry. a) NOTE: Due to drought, groundwater level has been lowered down to a depth of 1.5m from the ground surface. b) Net allowable load that the footing can carry using general bearing capacity equation and F.S.=3 assuming general shear failure in soil. c) Ultimate bearing capacity (qu) using prakash and saran theory with eB=0.3m and eL=0.5m. y = 17 kN/m 1 m 1.5 m Groundwater level 3 m x 2 m Yut = 19.5 kN/marrow_forward1. For the following cases, determine the allowable gross vertical load bearing capacity of the foundation. Use Terzaghi's equation. Part В D; Foundation Type 3 ft 3 ft 28° 400 psf 110 pcf Continuous a b 1.5 m 1.2 m 35° 17.8 kN/m³ Continuous 3 m 30° 30° 16.5 kN/m³ Square 2. A square foundation has to carry gross allowable load of 1805 kN (FS=3). Given: D; = 1.5 m, y=15.9 kN/m³, 0=34°, and c = 0. Use Terzaghi's equation to determine the size of the foundation (B).arrow_forward
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