Location
San Diego, California
Presentation Date
26 May 2010, 4:45 pm - 6:45 pm
Abstract
Recent researches have shown that piles are laterally unsupported in liquefiable soils during most strong earthquakes. If this unsupported length is significantly large, the high axial load on piles may make them more vulnerable to buckling instability. Calculation of buckling instability requires the full unsupported length of pile, which is the sum of pile length above the ground, pile length in the liquefied soil and a depth of fixity below the liquefied soil layer. In this paper, the length of fixity of pile foundations embedded in liquefiable soils has been investigated using a simple numerical method. The finite element program SAP2000 V12 has been used to carry out the parametric analysis. The soil has been modeled using Winkler spring approach, which models the lateral restraining effect of the soil as a set of discrete one-dimensional spring distributed along the length of the pile. The buckling loads of the piles embedded in the soil are evaluated using the eigenvalue analysis. The results are then compared and validated with previous analyses based on empirical, analytical and numerical methods. The sensitivity of the buckling load of the embedded piles are studied with respect to the factors such as the depth of liquefaction, the stiffness of the liquefied soil and the unsupported length of the pile, and the results are discussed.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Lombardi, Domenico; Durante, Maria Giovanna; Dash, Suresh R.; and Bhattacharya, Subhamoy, "Fixity of Piles in Liquefiable Soils" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 25.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session05/25
Included in
Fixity of Piles in Liquefiable Soils
San Diego, California
Recent researches have shown that piles are laterally unsupported in liquefiable soils during most strong earthquakes. If this unsupported length is significantly large, the high axial load on piles may make them more vulnerable to buckling instability. Calculation of buckling instability requires the full unsupported length of pile, which is the sum of pile length above the ground, pile length in the liquefied soil and a depth of fixity below the liquefied soil layer. In this paper, the length of fixity of pile foundations embedded in liquefiable soils has been investigated using a simple numerical method. The finite element program SAP2000 V12 has been used to carry out the parametric analysis. The soil has been modeled using Winkler spring approach, which models the lateral restraining effect of the soil as a set of discrete one-dimensional spring distributed along the length of the pile. The buckling loads of the piles embedded in the soil are evaluated using the eigenvalue analysis. The results are then compared and validated with previous analyses based on empirical, analytical and numerical methods. The sensitivity of the buckling load of the embedded piles are studied with respect to the factors such as the depth of liquefaction, the stiffness of the liquefied soil and the unsupported length of the pile, and the results are discussed.
