Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

This paper presents the test results of single (L/d = 15) and 2 x 2 group piles (L/d = 15 and s/d = 2, 3, 4) subjected to strong vertical and coupled vibration. The observed response curves display marked nonlinearity as the natural frequencies decreases with increasing intensity of excitation. The measured response is compared with the results obtained by using the continuum approach of Novak with dynamic interaction factor. To account for the nonlinear response of the piles, provisions are made for yielding of soil around the piles by introducing the weak boundary zone effect concept in the model. Different separation lengths between the pile and top soil are considered for different excitation intensities in the nonlinear analysis. Comparison with the test results show that the accuracy of the nonlinear analysis in predicting the dynamic response depends on the choice of parameters that best characterize the response of boundary zone around the pile and the realistic length of pile separation. The test data are used to establish the empirical relationships between the extent of soil separation around the pile and the maximum amplitudes for both vertical and coupled vibration. It is also found that the pile-soil-pile interaction and the embedded effect of the pile cap play a major role in the dynamic response of pile foundation.

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

Nonlinear Soil-Pile Interaction Under Vertical and Coupled Motion

San Diego, California

This paper presents the test results of single (L/d = 15) and 2 x 2 group piles (L/d = 15 and s/d = 2, 3, 4) subjected to strong vertical and coupled vibration. The observed response curves display marked nonlinearity as the natural frequencies decreases with increasing intensity of excitation. The measured response is compared with the results obtained by using the continuum approach of Novak with dynamic interaction factor. To account for the nonlinear response of the piles, provisions are made for yielding of soil around the piles by introducing the weak boundary zone effect concept in the model. Different separation lengths between the pile and top soil are considered for different excitation intensities in the nonlinear analysis. Comparison with the test results show that the accuracy of the nonlinear analysis in predicting the dynamic response depends on the choice of parameters that best characterize the response of boundary zone around the pile and the realistic length of pile separation. The test data are used to establish the empirical relationships between the extent of soil separation around the pile and the maximum amplitudes for both vertical and coupled vibration. It is also found that the pile-soil-pile interaction and the embedded effect of the pile cap play a major role in the dynamic response of pile foundation.