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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Textbook Question
Chapter 7, Problem 7.19QPP
Develop a spread sheet to compute allowable total vertical column loads using the ASD method and factored ultimate vertical column loads using LRFD. The spreadsheet should consider only vertical loads on a square or continuous footing bearing on single uniform soil. It should allow the input of footing width, depth, water table depth, soil strength parameters, a factor of safety for ASD, and a geotechnical resistance factor for LRFD. It should compute the bearing capacity based on both Terzaghi’s and Vesic "’s methods.
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A 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below grade. The column bearing on this footing will impose a load of 180kips. Assuming the subsurface conditions shown below with groundwater 5ft below grade, Use Schmertman’s method to calculate the elastic settlement of the system 6 years after construction is completed, provide a clear sketch and show units and state assumptions.
1. A 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below
grade. The column bearing on this footing will impose a load of 180kips. Assuming the
subsurface conditions shown below with groundwater 5ft below grade, Use
Schmertman's method to calculate the elastic settlement of the system 6 years after
construction is completed, provide a clear sketch and show units and state assumptions.
Oft
Sand
Ymoist = 120 pcf
Phi = 30deg
Es = 52 ksf
4ft
Loose Sand
5ft
Ymoist = 125 pcf
Yat = 145 pcf
Phi = 22deg
Es (above GW) = 30 ksf
Es (below GW) = 20 ksf
8ft
Dense Sand
Ysat = 155 pcf
Phi = 35deg
Es = 60 ksf
20ft
2. The foundation above is limited to a 1.5" settlement after 10 years, speak to whether the
design is adequate and if not how can you adjust the project to meet this criteria.
A spread footing supported on a sandy soil has been designed using ASD to support a certaincolumn load with a factor of safety of 2.5 against a bearing capacity failure. However, there issome uncertainty in both the column load, P, and the friction angle, f. Which would have thegreatest impact on the actual factor of safety: an actual P that is twice the design value, or actualf that is half the design value? Use bearing capacity computations with reasonable assumedvalues to demonstrate the reason for your response.
Chapter 7 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 7 - List the three types of bearing capacity failures...Ch. 7 - A 1.2 m square, 0.4 m deep spread footing is...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A column carrying a vertical downward unfactored...Ch. 7 - A column carrying a vertical downward ultimate...Ch. 7 - A 120 ft diameter cylindrical tank with an empty...Ch. 7 - A 1.5 m wide, 2.5 m long, 0.5 m deep spread...Ch. 7 - A 5 ft wide, 8 ft long, 2 ft deep spread footing...Ch. 7 - A bearing wall carries a total unfactored load 220...Ch. 7 - After the footing in Problem 7.9 was built, the...
Ch. 7 - A bearing wall carries a factored ultimate...Ch. 7 - A 5 ft wide, 8 ft long, 3 ft deep footing supports...Ch. 7 - Prob. 7.13QPPCh. 7 - A spread footing supported on a sandy soil has...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - A building column carries a factored ultimate...Ch. 7 - A 3 ft square footing is founded at a depth of 2.5...Ch. 7 - A building column carries factored ultimate loads...Ch. 7 - Develop a spread sheet to compute allowable total...Ch. 7 - A certain column carries a vertical downward load...Ch. 7 - Repeat Problem 7.20 using LRFD assuming the...Ch. 7 - Conduct a bearing capacity analysis on the Fargo...Ch. 7 - Three columns, A, B, and C, are collinear, 500 mm...Ch. 7 - Two columns, A and B, are to be built 6 ft 0 in...Ch. 7 - In May 1970, a 70 ft tall, 20 ft diameter concrete...
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- Prepare a spreadsheet to compute settlement of square footings using the e@log@p method. Thespreadsheet should allow input of: footing width, footing depth, groundwater depth, columnservice load, footing rigidity factor and Cr/(1 + e0), Cr/(1 + e0), sm′, and g as function ofdepth. Check your spreadsheet using a hand solutionarrow_forwardA 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_forwardDevelop a spread sheet to compute allowable total vertical column loads using the ASD methodand factored ultimate vertical column loads using LRFD. The spreadsheet should consider onlyvertical loads on a square or continuous footing bearing on single uniform soil. It should allowthe input of footing width, depth, water table depth, soil strength parameters, a factor of safetyfor ASD, and a geotechnical resistance factor for LRFD. It should compute the bearing capacitybased on both Terzaghi’s and Vesic ́’s methods.arrow_forward
- Question 3. A strip footing is to be used in a clay soil in which the imposed load is 1 MN/m length. The clay layer is 7.0 m thick and overlies a stiff, fractured siltstone. The water table lies at a depth of 2.0 m. a. Determine the footing width based on the long-term allowable bearing capacity (calculated according to the method in the Canadian Foundation Engineering Manual; neglect depth factors) using a factor of safety of 3.0 for a burial depth of 2.0 m. The material properties of the clay are: c' = 15 E = 42 MPa o' = 27° y= 18.5 kN/m³ Ce = 0.40 e, = 0.90 C, = 9.3 x 104m²/day Cu = 25 b. Why would bearing capacity failure likely not govern the design of this structure?arrow_forwardDiscuss DESIGN OF SPREAD FOOTINGS AGAINST BEARING CAPACITY FAILUREarrow_forwardDefine Load-Settlement Response of Footing on Sand ?arrow_forward
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