Contributions to static and seismic analysis of piles and pile-supported bridge piers

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Contributions to static and seismic analysis of piles and pile-supported bridge piers

Author: George Mylonakis | Size: 7.7 MB | Format: PDF | Quality: Unspecified | Publisher: State University of New York at Buffalo | Year: 1995 | pages: 312

A number of solutions are presented for the static, dynamic, and seismic response
of single piles, pile groups, and pilewgroup-supported bridge piers, on homogeneous and
layered soil deposits. Vertical, horizonta~ and moment loading are considered, and results
are presented in terms of both analytical closed-form expressions and
numerically-evaluated graphs. The seismic analysis considers both the kinematic and
inertial interaction, in the frequency as well as the time domains, with the excitation
properly specified through the acceleration at the surface ofthe "rock" outcrop.
The developed methods make use of certain physically-motivated simplifications
regarding the wave fields around an oscillating pile and the interplay of such fields with
other piles. Thus diffraction of the incident seismic waves by a pile and of the
pile--generated waves by other piles is represented in a realistic, although simplified, way.
The accuracy of the developed methods is systematically checked against available
solutions from the literature, as well as against a few field measurements.
The new developments in this dissertation include : (i) the presentation of solutions
for pile-to-pile interaction in multi-layered soil, and the demonstration of the profound
effect of soil layering on this interaction; (ii) the recognition and presentation of numerical
and analytical results for the "additional distress" on a pile from the waves emanating
from the neighboring piles; and (iii) the evaluation of certain popular approximations in
soil-structure-interaction analyses as performed in practice, such as ignoring the kinematic
response, ignoring the various types of radiation damping, assuming frequency-
independent stiffuesses, and artificially restricting pile--cap rotation.

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