Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Seismic soil-pile-structure interaction (SSPSI) is a complex process involving several, simultaneously occurring and, sometimes compensating phenomena. The physical processes that occur in the soil when a pile supported structure undergoes earthquake loading consist of pore-pressure generation, ground deformation and subsequent cyclic degradation, strain rate effects and gap-slap mechanism. Modeling these physical phenomena numerically is a challenge. Of the various approaches available in practice, the p-y method for evaluating lateral pile response is by far the most common. However, at present, a consensus has not been established among practitioners on the appropriateness of using p-y curves for post-liquefaction analyses. This paper presents a discussion of available models and modifications to p-y relationships used to model soil response under seismic conditions. Predictions made with these models are then compared with actual load test data performed by others. It is concluded that further research is needed to quantify and predict gap formation, the stress-strain behavior of liquefied soils and to accurately evaluate non-linear bending resistance of steel encased concrete sections.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Seismic Soil-Pile Interaction: Physical Processes and Analytical Models

San Diego, California

Seismic soil-pile-structure interaction (SSPSI) is a complex process involving several, simultaneously occurring and, sometimes compensating phenomena. The physical processes that occur in the soil when a pile supported structure undergoes earthquake loading consist of pore-pressure generation, ground deformation and subsequent cyclic degradation, strain rate effects and gap-slap mechanism. Modeling these physical phenomena numerically is a challenge. Of the various approaches available in practice, the p-y method for evaluating lateral pile response is by far the most common. However, at present, a consensus has not been established among practitioners on the appropriateness of using p-y curves for post-liquefaction analyses. This paper presents a discussion of available models and modifications to p-y relationships used to model soil response under seismic conditions. Predictions made with these models are then compared with actual load test data performed by others. It is concluded that further research is needed to quantify and predict gap formation, the stress-strain behavior of liquefied soils and to accurately evaluate non-linear bending resistance of steel encased concrete sections.