Critical evaluation of design methods for foundations under axial uplift and compression loading. Final report
This study is a critical evaluation of the analysis and design methodology recently proposed for the foundations of transmission line structures. A large data base of field load test case histories is used for detailed analysis of: (1) undrained capacity of drilled shafts, driven piles, and spread-type foundations in cohesive soils; (2) drained capacity of the same foundation types in cohesionless soils; and (3) uplift movements of drilled shafts and spread-type foundations. Both uplift and compression loading are evaluated, but the emphasis is on uplift. The evaluation of soil design parameters is considered, and new procedures are presented for estimating tip suction and in-situ horizontal soil stresses. The foundation analysis results are compared to the field load test data, and the statistics for these comparisons are presented. The results demonstrate the general usefulness of the recently proposed design methodology, subject to certain limitations. Undrained side resistance is discussed in detail, and recommendations are made for improving the available methods. Uplift movement predictions are shown to need improvement and warrant further study. Finally, the application of these results to current analysis and design practice is presented.
- Research Organization:
- Cornell Univ., Ithaca, NY (USA). Geotechnial Engineering Group
- OSTI ID:
- 6221597
- Report Number(s):
- EPRI-EL-3771; ON: TI85920125
- Country of Publication:
- United States
- Language:
- English
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Transmission-line structure foundations for uplift-compression loading. Final report
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