Using the data in Problem 1 and the AASHTO resistance factors, compute φPup,n.
Problem 1
Using the data in Problem 2 and the AASHTO resistance factors, compute φPn.
Problem 2
An 18 in diameter closed-end steel pipe pile is to be driven to a depth of 53 ft into the following soil profile:
Depth (ft) | Soil Classification | Unit Weight, γ (lb/ft3) | Friction Angle, φ′ (deg) | OCR |
0–5 | Silty sand | 118 | 28 | 5.0 |
5–20 | Fine to medium sand | 121 | 31 | 3.5 |
20–50 | Silty sand | 118 | 29 | 2.5 |
50–60 | Well graded sand | 123 | 35 | 2.0 |
No predrilling or jetting is to be used. The groundwater table is at a depth of 15 ft. Using a factor of safety of 3.0, compute the ASD allowable downward load capacity, Pa.
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