Question

1. For the foundation shown below: spp 60 kips (Load obtained from structural engineer) G.W.T 몰3ft Poorly Graded Sand (SP): 1m115 pcf (above G.W.T.) Ysat 125 pcf (below G.W.T.) Square footing, 4'x 4 imension Infoma 1-ft x 1-ft square concrete column. 1-ft thick foot" flanges conc 150 pcf Assume weight of reinforcing steel included in unit weight of concrete. Assume compacte weighs the same as in-situ soil d backfil Assume this foundation is being designed for a warehouse that had a thorough preliminary soil exploration. Using the general bearing capacity equation: Calculate the gross applied bearing pressure, the gross ultimate bearing pressure, and determine if the foundation system is safe using a gross bearing capacity ASID approach. Please include the weight of the foundation, the weight of the backfill soil, and the effect of the uplift pressure caused by the presence of the water table in your bearing capacity calculations. a. b. Calculate the net applied bearing pressure, the net ultimate bearing pressure, and determine if the foundation system is safe using a net bearing capacity ASID approach. Please include the weight of the foundation, the weight of the backfill soil, and the effect of the uplift pressure caused by the presence of the water table in your bearing capacity calculations. c. Discuss the relative effect of the weight of the foundation, the weight of the backfill soil, and the effect of the uplift pressure caused by the presence of the water table on your bearing capacity calculations (both net and gross). Discuss conservatism unconservatism and the validity of the assumption to include or neglect these factors in a bearing capacity analysis, by analyzing the magnitude of the contributions of these factors with respect to the loads that are applied by the structure.

Answer 1

45 oundaion:4x4x4 3 2ibt 306 Kps

Gappl'. Gross appl:J brin, pressure:งเ5ups Core (o due : 35

605 S p S do efect o. the TOSS Ca pac uptPrsSure adus the