Design of Piles for Downdrag (2024)
Chapter: 3 Develop Design Examples for Pile Downdrag
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SECTION 3
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Suggested Citation:
"3 Develop Design Examples for Pile Downdrag." National Academies of Sciences, Engineering, and Medicine. 2024. Design of Piles for Downdrag. Washington, DC: The National Academies Press.
doi: 10.17226/27863.
SECTION 3
Develop Design Examples for Pile Downdrag
Eight design examples are provided in Appendices C through J, published in NCHRP Web-Only Document 398: Design of Piles for Downdrag: Design Examples and Support Materials. The design examples include the use of hand calculations and different software programs. The purpose of the design examples is to demonstrate how to determine the location of the neutral plane, the amount of drag load that is estimated to develop under the loading scenario, and the amount of downdrag. Each of the design example topics is listed in Table 3.1 and contained in the corresponding appendix.
Table 3.1. Design example description.
| Appendix | Design Example | Analysis | Method |
|---|---|---|---|
| C | 1 | Embankment fill over clay | Hand calculations |
| D | 2 | Embankment fill over clay | PileAXL program |
| E | 3 | Embankment fill over clay (SHANSEP) | Hand calculations |
| F | 4 | Drawdown in clay | TZPILE |
| G | 5 | Liquefaction in sand (H-pile) using cone penetration test data | Settlement hand calculations, ALLCPT, and TZPILE programs |
| H | 6 | Liquefaction in sand (pipe pile) using cone penetration test data | Settlement hand calculations, ALLCPT, and TZPILE programs |
| I | 7 | Liquefaction in gravel using standard penetration test and shear wave velocity data | PileAXL and TZPILE programs |
| J | 8 | Embankment fill over clay over rock | PileAXL program |
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