United States Department of Transportation
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The Influence of Pile Shape on Lateral Load Resistance: Final Summary Report #2 for Study TPF-5(272)
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2018-08-01
[PDF-2.16 MB]
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Edition:Final Summary Report #2 May 2014 – Aug. 2018
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Abstract:The lateral resistance of pile foundations is typically based on the performance of circular piles even though other pile types are used. Due to a lack of data, there is a level of uncertainty when designing pile foundations other than circular piles for lateral loading. Theoretical analyses have suggested that square sections will have more lateral resistance due to the increased side shear resistance, but no test results have been available to substantiate the contention. Full-scale lateral load tests involving circular, square, and H piles were performed to consider the influence of soil-pile interaction on lateral load resistance. The load vs. deflection curves from the load tests show higher soil resistance from the H and square sections after accounting for differences in the moment of inertia for the different pile sections. The increased soil resistance can generally be accounted for using a p-multiplier approach with a value of approximately 1.25 for square piles or 1.2 for H piles relative to circular piles. This indicates that soil resistance on square and H piles is about 20% higher than that for round piles, and the increased resistance is primarily a result of increased passive resistance on the pile face rather than increased side shear. Alternative methods proposed to account for pile shape were not consistently reliable. This is the Final Summary Report #2 for pooled fund study TPF-5(272), “Evaluation of Lateral Pile Resistance Near MSE Walls at a Dedicated Wall Site.” Details of the research described in this report are available in the research final report prepared by Rollins et al. (2018) and published by the Utah Department of Transportation, along with the corresponding university theses.
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