Design of Drilled Piers Subjected to High Overturning Moments

by Anthony M. DiGioia, Jr., GAI Consultants Inc, Monroeville, PA, USA,

Document Type: Proceeding Paper

Part of: Innovations in the Design of Electrical Transmission Structures


The results are presented of a research study directed at improving the state-of-practice, and resulting foundation economy, in the design of laterally loaded drilled pier foundations subjected to high ground-line moments. A theoretical four-spring, subgrade modulus model was developed in this study and was subsequently modified using the results of 14 full-scale load tests. The resultant semi-empirical nonlinear model formed the basis for the development of a design/analysis computer program (PADLL) for drilled pier foundations embedded in multi-layered subsurface profiles. Potential cost savings associated with piers designed using the semi-empirical model are discussed.

Subject Headings: Foundation design | Drilling | Piers | Computer models | Lateral loads | Power transmission | Structural analysis | Load tests

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