Evaluation Of Kinematic Bending Moments
In A Pile Foundation Using
The Finite Element Approach
Author(s)
F. Grassi & M. R. Massimino
Abstract
During earthquakes seismic waves crossing through soft soil can lead to
significant curvatures on pile foundations, which in turn lead to significant
bending moments. These bending moments are commonly named \“kinematic
bending moments” to be distinguished from the \“inertial bending moments” due
to horizontal forces transferred from superstructures to pile heads. Approaches to
carefully evaluate inertial bending moments have been developed world-wide;
on the contrary, up until now different simplified approaches have only led to
different evaluations of the kinematic bending moments on pile foundations.
Thus, the evaluation of kinematic bending moments is still questionable.
Nevertheless, the European technical code EC8 and the new Italian technical
code, D.M. 14/01/2008, underline the importance, in the geotechnical and
structural design of pile foundations, of taking into account not only inertial
bending moments, but also kinematic bending moments, in order to avoid
significant structural damage.
In this paper a 3D soil-pile FEM system is analysed. The system is subjected
to a seismic input motion, applied at the base of the system, which represents the
conventional bedrock. The FEM analyses lead to the evaluation of the kinematic
bending moment distribution along the pile. Finally, the numerical results are
compared with those coming from some simplified approaches available in
geotechnical literature.
Keywords: earthquake, pile foundation, kinematic bending moment, finite
element method, Rayleigh damping.
Keywords
earthquake, pile foundation, kinematic bending moment, finite
element method, Rayleigh damping.
Related Book
Other papers in this volume
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