United States Department of Transportation
i
Performance-based design factors for pile foundations.
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2014-10-01
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[PDF-4.90 MB]
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Abstract:The seismic design of pile foundations is currently performed in a relatively simple, deterministic manner. This
report describes the development of a performance-based framework to create seismic designs of pile group
foundations that consider all potential levels of loading and their likelihoods of occurrence in a particular area.
Because of the multitude of factors that can exist at a site, development of a complete, integrated procedure
that would extend from ground motions to limit state exceedance was not practical. To make the problem more
useful to the research sponsors, a modular approach was developed. The framework allows for the development and
use of a structural model with a simplified representation of the foundation system. The discrete soil model was
developed using an equivalent linear format so that stiffness and damping characteristics were consistent with
deformation levels. The foundation loads computed in these analyses were then applied to a three-dimensional soil-pile group model to compute the resulting displacements and rotations of the pile cap.
A computer program was developed to perform the calculations required to develop load and resistance
factors and demand and capacity factors. The calculations allow a designer to select a return period for limit state
exceedance and then select the corresponding factors that will produce a design that corresponds to the desired limit
state exceedance rate.
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