A 50-kip vertical downward column load (P) acts at the center of a 4-ft-square (4-ft wide by 4-ft long) normal-weight reinforced concrete footing (Yconc = 150 pcf)). The bottom of this shallow footing is 3 ft %3D below the level ground surface, and the top of the footing is flush with the ground surface. Laboratory testing shows the soil from the ground surface to at least 15-ft depth is uniform clay with a total unit weight of 120 pcf and an undrained shear strength (Su) of 1.0 ksf. The long-term groundwater table is at a depth of 10 ft below the ground surface. Use the above information to answer the following two questions. Compute the weight of the foundation, Wf. Answer: Okips Oksf Okcf Compute the gross bearing pressure (contact pressure) at the base of the footing that is imposed on the underlying soil by the footing and column load. Answer: Oksf Okips

A 50-kip vertical downward column load (P) acts at the center of a 4-ft-square (4-ft wide by 4-ft long) normal-weight reinforced concrete footing (Yconc = 150 pcf)). The bottom of this shallow footing is 3 ft %3D below the level ground surface, and the top of the footing is flush with the ground surface. Laboratory testing shows the soil from the ground surface to at least 15-ft depth is uniform clay with a total unit weight of 120 pcf and an undrained shear strength (Su) of 1.0 ksf. The long-term groundwater table is at a depth of 10 ft below the ground surface. Use the above information to answer the following two questions. Compute the weight of the foundation, Wf. Answer: Okips Oksf Okcf Compute the gross bearing pressure (contact pressure) at the base of the footing that is imposed on the underlying soil by the footing and column load. Answer: Oksf Okips

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter16: Soil Bearing Capacity For Shallow Foundations

Section: Chapter Questions

Problem 16.14P: Redo Problem 16.13 with the following data: gross allowable load = 184,000 lb, = 121 lb/ft3, c = 0,...

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a square footing is to be constructed on a uniform thick deposit of clay with a unconfined compressive strength of 3kips/ft2. the footing will be located 5 ft below the ground surface and is designed to carry a total load of 300 kips. the unit weight of the supporting soil is 128lb/ft3. no groundwater was encountered during soil exploration. considering general shear, determine the square footing dimension, using a factor of safety of 3
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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.