Structural Engineering and Mechanics

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Effects of floating wave barriers on wave-induced forces exerted to offshore-jacket structure

  • Osgouei, Arash Dalili (Department of Civil Engineering, Maragheh Branch, Islamic Azad University) ;
  • Poursorkhabi, Ramin Vafaei (Department of Civil Engineering, Tabriz Branch, Islamic Azad University) ;
  • Hosseini, Hamed (Department of Civil Engineering, Dolatabad Branch, Islamic Azad University) ;
  • Qader, Diyar N. (Department of Civil Engineering, College of Engineering, Cihan University-Erbil) ;
  • Maleki, Ahmad (Department of Civil Engineering, Maragheh Branch, Islamic Azad University) ;
  • Ahmadi, Hamid (Faculty of Civil Engineering, University of Tabriz)
  • Received : 2021.05.19
  • Accepted : 2022.04.12
  • Published : 2022.07.10
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Abstract

The main objective of the present research was investigating the effects of a floating wave barrier installed in front of an offshore jacket structure on the wave height, base shear, and overturning moment. A jacket model with the height of 4.55 m was fabricated and tested in the 402 m-long wave flume of NIMALA marine laboratory. The jacket was tested at the water depth of 4 m subjected to the random waves with a JONSWAP energy spectrum. Three input wave heights were chosen for the tests: 20 cm, 23 cm, and 28 cm. Two different cross sections with the same area were selected for the wave barrier: square and rhombus. Results showed that the average decrease in the jacket's base shear due to the presence of a floating wave barrier with square and rhombus cross section was 24.67% and 34.29%, respectively. The use of wave barriers with square and rhombus cross sections also resulted in 19.78% and 33.11% decrease in the jacket's overturning moment, respectively. Hence, it can be concluded that a floating wave barrier can significantly reduce the base shear and overturning moment in an offshore jacket structure; and a rhombus cross section is more effective than an equivalent square section.

Keywords

Acknowledgement

The authors would like to thank the technical staff of NIMALA marine laboratory specially Eng. Taghi Aliakbari and Eng. Seyyed Abolfazl Hashemi. The support from the Vice-chancellery for Research and Technology of Islamic Azad University-Maragheh Branch is also highly appreciated.

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