Numerical Study of Pile Foundation on Sloping Ground under Seismic Loading
Date Issued
2015
Date
2015
Author(s)
Lin, Chia-Hui
Abstract
Pile foundation is a very common way to support the structures built on slopes. When earthquakes strike, they may drive the slopes to move and slide, which would exert additional loading to the piles. In addition, the cyclic loading may weaken the soil surrounding the pile if the induced strain is large. All of these may cause damages to the pile foundation which, in turn, affect the structure supported by the foundation. 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, finite difference analysis (using commercial software FLAC) is utilized to model the behavior of pile installed in sloping areas. Different pile lengths, ratios of bedrock depth to pile lengths and locations of piles would be considered. Moreover, effect of input ground motion variability on pile response is studied. This is achieved by using 30 input ground motions (each with different ground motion characteristics). These ground motions are selected based on the target design spectrum for Taipei Basin, which has 10-percent probability of exceedance in 50 years (corresponding to the return period of 475 years). Pile performance considered in this study includes maximum moment, maximum shear force and maximum lateral displacement. Trends of the pile response with ground motion parameters, model geometry, pile configuration and analysis types are evaluated.
Subjects
pile foundations
dynamic analysis
total stress analysis
effective stress analysis
Type
thesis
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