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 8, Problem 8.11QPP
A proposed office building will include an 8 ft6 in square, 3 ft deep spread footing that will support a vertical downward service load of 160 k. The soil below this footing is an overconsolidated clay with the following engineering properties:
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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.
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.
2) 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.m
A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also3 feet) spread footing. The normally consolidated clay has the following engineering properties:γdry = 115.0 pcfφ’=24°c’= 90.0 psfCc/(1+e0) = 0.15The soil stratum extends to a great depth, and the ground water table is 50 ft below the groundsurface.a) Using the classical piece-wise log-linear method, estimate the total settlement of thisfooting considering only the allowable bearing pressures using ASD approach. The unitweight of concrete is 150 pcf. State any assumptions made.b) What is the maximum bending moment from the earthquake that this foundation cansupport? Consider bending moment only about one axis.c) In the case of your estimated maximum bending moment, what would be the totalsettlement?
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Foundation Design: Principles and Practices (3rd Edition)
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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 an 8 ft 6 in square, 3 ft deep spread footing that will sup-port a vertical downward service load of 160 k. The soil below this footing is an overconsolidated clay with the following engineering properties: Cc /(1 + e0) = 0.10, Cr/(1 + e0) = 0.022,sm′ = 4,500 lb/ft2and g = 113 lb/ft3 . This soil strata extends to a great depth and the ground-water table is at a depth of 50 ft below the ground surface. Determine the total settlement of this footing.arrow_forward12- Calculate the net allowable soil stress of a soll with allowable stress 300 kN/m2 in the depth of 2.50 m from the soil surface under the footing of which height is 0.50 m. Unit weight of concrete is 25 kN/m3 and unit weight of the soil is 18 kN/m3. a) b) 3 d) e) 251.5 kN/m 351.5 kN/m2 251.5 kN/m3 None. 251.5 kN/m2 Boş birakarrow_forward2- 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)arrow_forward
- A certain column carries a vertical downward load of 448.0 k. It is to be supported on a 3.0-ft deep rectangular footing. Because of a nearby property line, this footing may be no more than 5.0 ft wide. The soil beneath this footing is a silty sand with the following properties: y = 122.4 lb/ft³, c'=50.0 lb/ft², p=34.0°. The groundwater table is at a depth of 6.0 ft below the ground surface. Using ASD to compute the footing length required for a factor of safety of 3.0. Solution: 1. Determination of the method: According to the given information, the best suitable method would be Surcharge stress OD y' = = b. Sq 2. Determination of bearing capacity factors - function of ': a. Nc = b. Nq = c. Ny = 3. Determination of other bearing capacity factors: 3.1 Shape factors: a. Sc = pcf. = a. dc = c. Sy 3.2 Depth factors: k = + = + = /L; b. dq c. dy 3.3 Inclination factors: All inclination factors = /L; psf /L; 3.4 Surcharge stress at depth D: a. O'zD psf; mehod.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_forward7.16 A 650-kN column load is supported on a 1.5-m wide by 2.0-m long by 0.5 m deep spread footing. The soil below is a well graded, normally consolidated sand with y = 17.0 kN/m' and the following SPT N60 values: Depth (m) 1.0 2.0 3.0 4.0 5.0 N60 12 13 13 18 22 The groundwater table is at a depth of 25 m. Using Schmertmann's method and hand compu- tations, compute the total settlement at t = 30 yr.arrow_forward
- An eccentric footing shown has the following loads which acts on the center of the column: Pdl=400 kN Pll=650 kN Thickness of footing is 400mm f'c= 29 MPa; fy =420 MPa db=20mm Calculate the following: 1. The minimum and maximum soil pressure due to service loads 2. The minimum and maximum soil pressure due to factored loadsarrow_forwardProblem 2. A rectangular footing supports a square column concentrically. Given: Footing Dimensions: 3.0m wide x 4.5m long and 0.75m depth Column Dimensions: 0.40m x 0.40m Concrete, fc’ = 21MPa Steel, fy = 275MPa Concrete cover to the centroid of steel reinforcements = 110mm Unit weight of concrete = 23.5kN/m3 Unit weight of soil = 16kN/m3 Determine the concentrated load that the footing can carry based on beam action. Calculate the concentrated load that the footing can carry based on two-way action. If the allowable soil pressure at service loads is 200kPa, what column axial load (unfactored) in kN can the footing carry if depth of earth fill is 2.0m above the footing?arrow_forwardA (4m x 5m) rectangular footing was supported bya saturated clay layer with a thickness of 5m. If the second layer (below the clay) was a saturated sand. The settlement that could be occurred in this site: a. None of the given answers are correct b. Is only long term settlement C. Is a short term settlement O d. Is only consolidation settlementarrow_forward
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