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 = 120 pcf 30deg 52 ksf

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Chapter2: Loads On Structures
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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.
Transcribed Image Text: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.
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