Using the data in Problem and the AASHTO resistance factors, compute φPn.
Problem
A 24 in square prestressed concrete pile is to be driven to a depth of 68 ft into the following soil profile:
Depth (ft) | Soil Classification | Unit Weight, γ (lb/ft3) | Undrained Shear Strength, Su (lb/ft2) |
0–10 | Silty clay | 110 | 1000 |
10–32 | Clayey silt | 118 | 1300 |
32–40 | Clay | 116 | 2000 |
40–70 | Clay | 119 | 2500 |
The groundwater table is at a depth of 5 ft. Using the Randolph and Murphy method with a factor of safety of 3.0, compute the ASD allowable downward load capacity, Pa.
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