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Accurate Estimation of the 100-Year Responses From the Probability Distribution of Extreme Surface Elevations

[+] Author Affiliations
H. Mallahzadeh, Y. Wang, G. Najafian

University of Liverpool, Liverpool, UK

M. K. Abu Husain, N. I. Mohd Zaki

Universiti Teknologi Malaysia, Kuala Lumpur, Malaysia

Paper No. OMAE2014-24589, pp. V04BT02A044; 10 pages
doi:10.1115/OMAE2014-24589
From:
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4B: Structures, Safety and Reliability
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4543-1
  • Copyright © 2014 by ASME

abstract

Accurate estimation of the 100-year responses (derived from the long-term distribution of extreme responses) is required for the safe and economical design of offshore structures. However, due to nonlinearity of the drag component of Morison’s wave loading and also due to intermittency of wave loading on members in the splash zone, the response is often non-Gaussian; therefore, simple techniques for derivation of the probability distribution of extreme responses are not available. To this end, conventional Monte Carlo time simulation technique could be used for predicting the long-term probability distribution of the extreme responses. However, this technique suffers from excessive sampling variability and hence a large number of simulated response records are required to reduce the sampling variability to acceptable levels. This paper takes advantage of the correlation between extreme responses and their corresponding extreme surface elevations to derive the values of the 100-year responses without the need for extensive simulations. It is demonstrated that the technique could be used for both quasi-static and dynamic responses.

Copyright © 2014 by ASME

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