Structural evaluation of fixed offshore platforms
Structural evaluation of fixed offshore platforms
Date
1975-01
Authors
Vandiver, J. Kim
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DOI
10.1575/1912/1360
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Keywords
Offshore structures
Structural dynamics
Hydraulic structures
Structural dynamics
Hydraulic structures
Abstract
In fixed offshore structures, damage incurred below the
waterline is often difficult to detect, but significant enough
to be the source of a subsequent massive failure. A technique
is described that can be used to detect subsurface structural
failure by detecting changes in the natural frequencies of the
structure. One tower aas extensively studied; the dynamic measurement
and analysis techniques are described. A parallel computer
model of this tower was used to simulate the effect of removal
of structural members on natural frequency. The parameters which
determine the level of minimum detectable damage are discussed.
Experimental data correlating wind and wave height spectra to
observed structure response is presented. Statistical Energy
Analysis is introduced as a method for predicting the dynamic
response of offshore towers to random waves. The method is superior
to the classical random vibration approach, in that it does not
require the calculation of the wave force spectrum from the wave
height spectrum, thus eliminating the calculations and assumptions
common to the frequently used Morrison wave force equation. SEA is
also applicable to a broad range of fixed and floating structures.
Description
Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution January, 1975
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Citation
Vandiver, J. K. (1975). Structural evaluation of fixed offshore platforms [Doctoral thesis, Massachusetts Institute of Technology and Woods Hole Oceanographic Institution]. Woods Hole Open Access Server. https://doi.org/10.1575/1912/1360