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Extreme structural responses by nonlinear system identification for fixed offshore platforms

Mohd. Zaki, Noor Irza and Abu Husain, Mohd. Khairi and Najafian, G. (2018) Extreme structural responses by nonlinear system identification for fixed offshore platforms. Ships and Offshore Structures, 13 . pp. 251-263. ISSN 1744-5302

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Official URL: https://doi.org/10.1080/17445302.2018.1443377


Offshore structures are exposed to random wave loading in the ocean environment. The response is commonly non-Gaussian due to the nonlinearity of the drag component of Morison's wave loading and also the load intermittency on members in the splash zone. The previous study shows that the developed finite-memory nonlinear system (FMNS) model can efficiently simulate the response of an offshore structure to random Morison wave loading. However, the FMNS models minimise the computational effort, and the estimates are not particularly good for lower significant wave height value. To overcome this deficiency, a modified version of FMNS models (MFMNS) is used to compute the extreme response values which increase the accuracy but is computationally less efficient than the current FMNS models. In this study, the probability distributions of extreme responses from both models are compared with corresponding distributions from the conventional time simulation technique to establish their level of accuracy.

Item Type:Article
Uncontrolled Keywords:extreme structural response, reliability analysis
Subjects:T Technology > T Technology (General)
Divisions:Razak School of Engineering and Advanced Technology
ID Code:84260
Deposited By: Siti Nor Hashidah Zakaria
Deposited On:16 Dec 2019 03:22
Last Modified:16 Dec 2019 03:22

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