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 2, Problem 2.11QPP
To determine
The factor of safety required.
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A column is supported on a footing as shown in the figure below. The water table is at a depth of 10
m below the base the base of the footing.
Column
Footing
1.5 mx 3.0 m
GL
1.0 m
Sand
Y = 18 kN/m²
N₂-24
N₁=20
The safe load (kN) that the footing can carry with a factor of safety 3 is
Tthe footing shown in a figure below is subjected to a uniform load of 300KPa. Calculate the vertical stress component at 2m below point A. Using the concept of superposition of concentrated loads
A reinforced concrete tower is provided on a ring foundation of inner diameter of 6m and outer diameter of 12m. If the foundation carries a
distributed load of 250kN/m2, determine the vertical stress at a depth of 6m below the center of the foundation.
Select the correct response:
90.497 kPa
66.027 kPa
83.527 kPa
70.567 kPa
Chapter 2 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 2 - Classify the uncertainty associated with the...Ch. 2 - Figure 2.1 shows the PDF for a normal distribution...Ch. 2 - List three sources of epistemic uncertainty...Ch. 2 - Using a random number generator create a sample of...Ch. 2 - A certain column will carry a dead load estimated...Ch. 2 - A simply supported beam has a length of 3 m and...Ch. 2 - Using the data shown in Figure 2.5 determine the...Ch. 2 - The capacity for a certain foundation system is...Ch. 2 - We wish to design a shallow foundation with a...Ch. 2 - Prob. 2.10QPP
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- i. Discuss about Ultimate Bearing Capacity and types of bearing capacity failures.arrow_forwardA combined trapezoidal footing of length L supports two identical square columns (P, and P;) of size 0.5 m x 0.5 m, as shown in the figure. The column P, and P, carry loads of 2000 kN and 1500 kN, respectively. L 5 m 1.5 m P2 1 5 m If the stress beneath the footing is uniform, the length of the combined footing L (in m, round off to two decimal places) is P.arrow_forwardCalculate the equivalent radius of the resisting section of 20 cm thick slab, if the ratio of the radius of wheel load distribution to the thickness of the slab is 0.5. (a) 8 (c) 20 (b) 10.16 (d) 23.66arrow_forward
- The specific weight of the concrete is 150 ??⁄??3, and the coefficient of friction between the base of the dam and the foundation is 0.42. If the factor of safety against overturning is 2, compute for the minimum width of the dam. Unit of the Correct Answer: ft a. 1.684 b. 6.841 c. 8.416 d. 4.681arrow_forwardA pad footing of dimensions 1.2 m by 2.5 m. applies a surface pressure of 425 kPa. The pad footing is underlain by a 1 m thick layer of gravel soil, then a 4 m thick layer of clay soil. Using the "2:1 load distribution of a rectangular load" method, calculate the applied pressure beneath the footing at the top of the clay layer, and 1.5 m below the top of the clay layer.arrow_forwardThe floor system of a residential building consists of 125mm thick concrete slab (unit weight = 23.6 KN/m^3) resting on the three 8 m spanned RC floor beams spaced at 1.7 meters on center. Size of RC beam is 200mm x 450mm. NSCP 2015 load Factors: 1.2DL & 1.6LL. Assume simple supports. Calculate the unfactored slab in KN/m? Express your answer in 1 decimal places.arrow_forward
- The figure given below represents the contact pressure distribution underneath a Footing 世。 (A)Rigid footing on saturated clay (B) Rigid footing on sand (C) Flexible footing on saturated clay (D) Flexible footing on sandarrow_forwardA column of 5m long whose one end is fixed , and other end is pinned with a slenderness ratio of 25 is used in a RCC building.determine the reduction factor for this long coloumn by using working stress method . A) 0.513 B) 0.627 C) 0.897 D) 0.729arrow_forward250 30/0 Priv Ter * Question Completion Status: 87°F Cloudy L 4 PA 5 6 Cross Section Area, A = 0.04 m² Axial Load, P = 171 KN Angle, 0 = 53° 7 # The bar is subjected to the axial load. There is a shaded section which is oriented at 0 from the horizontal. Given: 8 10 Moving to another question will save this response. LA A Determine the average normal stress (MPa) acting over the shaded section. Express your answer in 2 decimal places. $ 12 13 14 15 16 % P > S (C 17 & 18 19 hp W 00 20 6arrow_forward
- Consider a column and footing assembly shown, where the soil incurs a couple of reaction force R to the footing at the bottom in response to the force P applied at the top of the column to maintain equilibrium. Force P is 5 kN.What is the equivalent couple-set of force P at the midpoint (A) of the footing assembly?arrow_forwardA rectangular footing of B=3 and L=6 rests at the depth of 2 m below theground level. The stress induced by the footing is 40 kPa. The unit weight of the soil is 18kN/m3and the groundwater table is at a great depth. A pipeline is to be constructed under thefooting. In order to design the strength of the pipeline, calculate the stress increase on thepipeline by using Boussinesq’s Method in the case:a) Pipeline at 5 m below the centerline of the footingb) Pipeline at 5 m below the corner of the footingarrow_forwardH← N M 1m QUESTION 2: Check if the base area of 2m x 2m is adequate for the footing under the loading shown in the figure. Allowable soil pressure is 0.25 MPa. N = 900 KN M = 150 kNm H=75kNarrow_forward
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