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title

LONG TERM STRESS RANGE DISTRIBUTION OF THE RISER OF AMIRKABIR SEMISUBMERSIBLE PLATFORM UNDER THE EFFECT OF WAVES

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Year: 2018
COI code: ICOPMAS13_109
Paper Language: English

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Authors LONG TERM STRESS RANGE DISTRIBUTION OF THE RISER OF AMIRKABIR SEMISUBMERSIBLE PLATFORM UNDER THE EFFECT OF WAVES

  Zohreh Sadat Haghayeghi - Marine Engineering Department, Amirkabir University of Technology, Tehran, Iran
  Mohammd Javad Ketabdari - Marine Engineering Department, Amirkabir University of Technology, Tehran, Iran

Abstract:

Top-tensioned risers, are prone to high amplitude vibrations under the effect of waves, vortex shedding, vessel motion and internal flow. Due to the oscillating nature of forces acting on the riser, it experiences varying stress ranges which leads to fatigue damage. In this research the riser of Amirkabir semisubmersible rig was modeled to estimate the long-term stress range distribution over its length. For this purpose a FEM model of a tensioned Euler-Bernoulli beam was developed for simulation of riser s motions. The vibration of riser under the effect of waves in the long-term was calculated in the time domain for different sea states from the wave scatter diagram. The riser has been analyzed in each sea state ofthe wave scatter diagram by 50 times to reduce the sampling error. Then a rainflow cycle counting method was applied to find the stress ranges and the number oftheir occurrences. Finally a Weibull distribution was fit to the stress ranges to find the distribution of stress ranges in the lifetime of riser

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COI code: ICOPMAS13_109

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Haghayeghi, Zohreh Sadat & Mohammd Javad Ketabdari, 2018, LONG TERM STRESS RANGE DISTRIBUTION OF THE RISER OF AMIRKABIR SEMISUBMERSIBLE PLATFORM UNDER THE EFFECT OF WAVES, 13th International Conference on Coasts, Ports and Marine Structures, تهران, سازمان بنادر و دريانوردي, https://www.civilica.com/Paper-ICOPMAS13-ICOPMAS13_109.htmlInside the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Haghayeghi, Zohreh Sadat & Mohammd Javad Ketabdari, 2018)
Second and more: (Haghayeghi & Ketabdari, 2018)
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Type: state university
Paper No.: 19671
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