Numerical Analysis of Pile Behavior under Earthquake Loading
Date Issued
2015
Date
2015
Author(s)
Tseng, I-Chen
Abstract
In the discipline of geotechnical earthquake engineering, the seismic behavior of pile can be analyzed by dynamic p-y method, or dynamic finite element / finite difference analysis. In this research, dynamic P-Y analysis, which is based on the theory of beam on nonlinear Winkler foundation (BNWF), is utilized to study the effect of input ground motion variability on pile response. In this study, before the dynamic P-Y analyses are performed, time history selection is carried out to select 50 recorded ground motions that are compatible with the target design spectrum of Taiwan Basin. Then, equivalent-linear frequency domain free-field site response analyses are performed (with the selected ground motions as input) to obtain the free-field displacement histories at various depths. These displacement histories are then imposed on the spring nodes in a dynamic P-Y analysis model. Correlations between the computed pile response, in terms of maximum moment and shear force, and input ground motion parameters are studied. It is observed that the amplitude of the input ground motion (as represented by Arias Intensity, peak ground acceleration) has high correlation with pile response. Also, the correlation between frequency parameters of the input ground motion and pile response seems to be weak. However, the pile response seems to be higher if significant frequency of the input motion is close to the natural frequency of the pile. In addition, site-source distance or magnitude alone may not correlate well with the pile response, while input ground motion with shorter significant duration seems to lead to higher pile response.
Subjects
Dynamic P-Y analysis
ground motion variability
site response
Type
thesis
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