Response Of Free Standing Flexible Cylinders
To Waves
Author(s)
D. D. K. Anbiah & J. M. Roesset
Abstract
The effects of the surrounding water on the dynamic response of flexible, free
standing, cylinders fixed at their base, is studied using linear diffraction theory
and two different solution approaches. The first one uses a consistent
transmitting boundary to reproduce the water, while the second expresses
analytically the solution in terms of the natural modes of vibration of the water
and of the structure. This approach, used first by Liaw and Chopra (Report
EERC 73-25, University of California, 1973) proves to be very efficient and
accurate. Results are presented in terms of change in the effective natural period
of the cylinder due to the presence of the water, and the effective damping,
considering both an incompressible and a compressible fluid. The same
formulation is used next to determine the dynamic response of these cylinders to
wave action. The results (base shear and overturning moment) for the flexible
cylinders are compared to those that would be obtained assuming a rigid cylinder
(only diffraction forces).
Keywords: hydrodynamics, diffraction forces, flexible cylinders.
1 Introduction
The dynamic response of a flexible vertical cylinder fixed at its base and
surrounded by water has been a problem of interest in relation to the design of
some harbor structures subjected to wave action, impact forces or earthquake
excitation. It was investigated in this work considering the cylinder subjected to
a harmonic force applied at its top and under the action of waves. Solutions were
obtained for both an incompressible and a compressible fluid, using linear
diffraction theory and the equivalent of Morison’s equation and comparing the
numerical predictions. In the former case two different formulations were used
Keywords
hydrodynamics, diffraction forces, flexible cylinders.
Related Book
Other papers in this volume
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