Location
New York, New York
Date
17 Apr 2004, 10:30am - 12:30pm
Abstract
The effects of material nonlinearity of soil on dynamic behavior of a single pile and pile groups are investigated. An advanced plasticity based soil model, HiSS, is incorporated in the finite element formulation. To simulate radiation effects, proper boundary conditions are used. The model and algorithm are verified with analytical results that are available for elastic and elasto-plastic soil models. Analyses are performed for seismic excitation as well as for loads applied on the pile cap and the effect of nonlinearity is investigated. Effects of spacing between piles are investigated. It was found that the effect of soil nonlinearity on the seismic response is very much dependent on the frequency of excitation. At low frequencies, its effect is significant but at higher frequencies it is negligible. For the loading on a pile cap, the nonlinearity decreases the dynamic stiffness of the soil-pile system. Effect of nonlinearity on the dynamic stiffness is shown to be sensitive to the spacing between piles. Nonlinearity suppresses wave interference effects among piles and thus reduces the stiffness significantly at excitation frequencies where the group effect is most important.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2004 University of Missouri--Rolla, 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
Maheshwari, B. K. and Truman, Kevin Z., "Nonlinear Dynamic Behavior of Pile Groups: Effects of Plasticity of Soil" (2004). International Conference on Case Histories in Geotechnical Engineering. 32.
https://scholarsmine.mst.edu/icchge/5icchge/session03/32
Nonlinear Dynamic Behavior of Pile Groups: Effects of Plasticity of Soil
New York, New York
The effects of material nonlinearity of soil on dynamic behavior of a single pile and pile groups are investigated. An advanced plasticity based soil model, HiSS, is incorporated in the finite element formulation. To simulate radiation effects, proper boundary conditions are used. The model and algorithm are verified with analytical results that are available for elastic and elasto-plastic soil models. Analyses are performed for seismic excitation as well as for loads applied on the pile cap and the effect of nonlinearity is investigated. Effects of spacing between piles are investigated. It was found that the effect of soil nonlinearity on the seismic response is very much dependent on the frequency of excitation. At low frequencies, its effect is significant but at higher frequencies it is negligible. For the loading on a pile cap, the nonlinearity decreases the dynamic stiffness of the soil-pile system. Effect of nonlinearity on the dynamic stiffness is shown to be sensitive to the spacing between piles. Nonlinearity suppresses wave interference effects among piles and thus reduces the stiffness significantly at excitation frequencies where the group effect is most important.
