EBK FOUNDATION DESIGN
3rd Edition
ISBN: 9780133424478
Author: CODUTO
Publisher: YUZU
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Chapter 3, Problem 3.15QPP
A footing with an embedment of 2 m is embedded in a sand with a unit weight of
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A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: Ydry = 115.0 pcf $'=24° c'= 90.0 psf Cc/(1+eo) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. What is the maximum bending moment from the earthquake that this foundation can support? Consider bending moment only about one axis.
2- Determine the stress increase below the center of the footing using both theoretical and approximate
methods at the top, middle and bottom of the clay layer. In addition, determine the average stress
increase for the clay layer.
Dimensions in
Heights in m
Unit weights in kN/m3
kN
m
P2
H1 H2
H3
BL
Hw
2.5
Yoati
18.0 19.0
3.0
3.0
2.0
16.0
2
3
1174
Load - 0
Hw
H1
H2
H3
OSand Clay (hoemally conactiduted)
A 3 ft square footing carries a sustained load of 10 k. It is placed on the surface of a 30 ft thicksaturated overconsolidated clay underlain by dense sand. Based on laboratory tests, the clay
can be adequately modeled using the e@log@p method. The laboratory tests provide the follow-ing compressibility information for the clay:
g = 123 lb/ft3Cc1 + e0= 0.06Cr1 + e0= 0.002sm′ = 900 lb/ft2
The groundwater table is located at the ground surface. Compute the settlement of the footing.
Chapter 3 Solutions
EBK FOUNDATION DESIGN
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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- A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, = 26, = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardA 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, =26, = 19 kN/m3, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardRefer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The distance between the two column loads L3 = 13.5 ft. The proximity of the property line at the left edge requires that L2 = 3.0 ft. The net allowable soil pressure is 2500 lb/ft2. Determine the breadth and length of a rectangular combined footing.arrow_forward
- A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: Ydry = 115.0 pcf $'=24° c'=90.0 psf Cc/(1+eo) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. Using the classical piece-wise log-linear method, estimate the total settlement of this footing considering only the allowable bearing pressures using ASD approach. The unit weight of concrete is 150 pcf. State any assumptions made.arrow_forwardA square footing 5 ft by 5 ft supported on a sandy stratum is designed to carry a column loading of 250,000 lb. The unit weight of the sands underlying the footing location vary between 120 and 125 pcf. Estimate the foundation settlement to be expected using the subgrade reaction method. (Neglect the weight of the footing.)arrow_forwardA 3 ft square footing carries a sustained load of 10.6kips. It is placed on the surface of a 30 ft thick saturated overconsolidated clay underlain by dense sand. Based on laboratory tests, the clay can be adequately modeled using the e-log-p method. The laboratory tests provide the following compressibility information for the clay: y = 123.4lb/ft³ Cc = 0.064 1+eo Cr 1+eo Aom = 920lb/ft² The groundwater table is located at the ground surface. Estimate the primary consolidation occurred in the clay layer. Solution: Preliminary Calculations: 1). It should be adequate to compute the compressibility to a depth of = 0.0024 2). Layer thickness = ft; 2). Bearing pressure at the bottom of the footing: q = Primary consolidation for each layer: a). Layer 1: 1). depth to layer midpoint = 2). Total vertical stress at midpoint: Oz ft; 3). Pore water pressure at midpoint: u = 4). Effective vertical stress at minpoint: Oz! 6). Induced vertial stress: Az = = = 9). The type of this layer of soil is :…arrow_forward
- A 1.8 m square, 2 m deep footing supports a service load of 570 kN. It is supported on a clayey sand. A dilatometer test run at the site has returned the following modulus profile. Compute the footing settlement.arrow_forward2) A square footing carries an allowable load of 59130kg including its own weight. The bottom of footing is 1.0m below ground surface and water table coincide with bottom of footing. Assume General shear failure. Unit Weight = 1846kg/cu.m c= 1605kg/sqm Nc = 35 Nq=22 Ny=19 1.0m Sat unit wt = 1956kg/cu.marrow_forwardAccording to Terzaghi's equation, the bearing capacity of strip footing resting on cohesive soil (C = 10kN/m2) per unit depth and unit width (Nc = 5.7) will be.arrow_forward
- A strip footing carries a load 14506 lbs per foot of length. The footing has a width of 2.3 ft. Determine the increase in vertical stress directly below the center of the footing at a depth of 0.8 ft. Provide your answer in psf, to 2 decimal place. Do not include units in your response.arrow_forwardA 2m x 3m footing constructed on a sand deposit (as shown in the Figure below) is subjected to centric vertical loading at a depth of 1.5m below the ground surface. Energy-corrected SPT Noo values from the field are given below. Assume c' = 0, y = 18.5 kN/m, Vat = 19.5 kN/m, %3D Assuming Factor of Safety = 3, compare the gross allowable load for the following scenarios. (a) When the ground water table is located at the ground surface. (b) When the ground water table is located 0.5 m below the ground surface. (c) When the ground water table is located at the base of the footing. (d) When the ground water table is located 1m below the base of the footing. (e) When the ground water table is located 5 m below the base of the footing. Ground water D able Casel D Casell Yaturated unit weight Depth (m) Neo 1.5 3.0 4.5 6.0 10 7.5 10 9.0arrow_forward2. A building with a circular footing is constructed as the following figure. The design building load to the footing is 9650 kN. Find the distributed stress (Aoz) and final effective stress (o'vf) due to the circular footing at the following locations: at the intersection point of the footing center and a depth of 5.5 m. b. at the intersection point of the footing center and the mid-point of the clay layer? You are tasked to find out the depth of the mid-point of the clay layer. а. 5m Sand 4m Ysand = 18.5 kN/m³ %3D Clay Yclay = 15.8 kN/m3 %3D | 10m Sand Bedrock Center of footingarrow_forward
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