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The dynamics of offshore gravity platforms: Some insights afforded by a two degree of freedom model
Author(s) -
Taylor R. Eatock,
Duncan P. E.
Publication year - 1978
Publication title -
earthquake engineering and structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.218
H-Index - 127
eISSN - 1096-9845
pISSN - 0098-8847
DOI - 10.1002/eqe.4290060504
Subject(s) - idealization , simple (philosophy) , principal (computer security) , submarine pipeline , degree (music) , degrees of freedom (physics and chemistry) , interpretation (philosophy) , finite element method , engineering , computer science , classical mechanics , structural engineering , physics , geotechnical engineering , acoustics , programming language , philosophy , epistemology , quantum mechanics , operating system
This paper presents some findings of an investigation into the dynamic behaviour of offshore gravity platforms excited by waves. Results obtained from a finite element model are presented in the form of dynamic magnification factor curves for two structures typical of current concrete platform designs. In order to facilitate interpretation of these results a simple two degree of freedom model is developed and the equivalent results presented. These are found to be very similar to those obtained from the more detailed idealization, and it is therefore concluded that the principal mechanisms involved in the dynamic behaviour of offshore gravity structures are adequately represented in the simple model. Several useful insights into this behaviour are then achieved by closer examination of the two degree of freedom configuration.