The dynamic analysis of fixed deep-water platform




period of oscillations, deep-water platform, discrete model, connected mass, ice field


The industrial progress is closely related with active using of hydrocarbons more than half of reserves of which lie in rock formations beneath seabed or ocean floor. For oil production at the great depth of immersion oil production fixed platforms are used most often. But using of such technological structures is not limited only to interest of oil and natural gas industry whereas they are important for navigation and military purposes. Offshore fixed platforms are exposed to effects of a high seismicity, wind, waves, strong undercurrents and an impulse impact during the movement of ice fields especially when exploitation in northern seas. The impact of different factors on the value of the period of natural oscillations ofthe offshore fixed deep-water ice-resistant platform with the depth of immersion 120 m that rests on the pile foundation was researched. Two discrete idealized models of the platform were used for the analysis: the first model that was implemented without taking into account the flexibility of the foundation and the second model where the flexibility of the pile foundation and the action of ground foundation were taking into account by the addition of elastic links that simulate the elastic connection between joints. Also, impacts of the connected mass of water media that was modeled in the form of additional distributed joints mass and the impact of the ice field that was modeled by the addition of additional links were investigated. The analysis showsthat values of periods of natural oscillations form increase by 8-20% when the flexibility of the pile foundation was taken into account; increase by 9-100% when the impact of the connected mass of water media was taken into account; decrease by 9-100% when the impact of the ice field and water media were taken into accountthat is significant when analyzing of stress-strain state of members of the structure.

Author Biographies

Roman Ostapenko, Kyiv National University of Construction and Architecture

assistant of the Department of Construction Mechanics

Iryna Kara, Kyiv National University of Construction and Architecture

candidate of technical sciences, associate professor, associate professor of the Department of Construction Mechanics


Bileckyy, V.S., Orlovskyy V.M.,Vitryk V.G. Osnovy naftogazovoyi ingeneriyi (Basics of oil-gas engineering). Poltava: TOV «ASMI», 2018.415 p. (ukr).

Orlovskyy V.M., Bileckyy, V.S., Vitryk V.G., Sirenko V.I. Tehnologiya vydobuvannya nafty (Technology of oil production). Lviv: «Novyysvit – 2000», 2022. 308 p. (ukr).

Douson, T.H. Proektirovaniye soorugeniy morskogo shelfa (Offshore structural engineering). L.: Sudostroeniye, 1986. 288 p. (rus).

Brebbia, C.A., Walker, S. Dinamika morskih soorugeniy (Dynamic Analysis of Offshore Structures). L.: Sudostroeniye, 1983. 238 p. (rus).

Sveshnikov, O.H. Pobudova modeley dlya rozvyazku statychnyh I dynamichnyh zadach morskyh platform na pulyah (Developing of models for solving of static and dynamic broblems of offshore platforms on piles). Strength of Materials and Theory of Structures: Scientific-and-technical collected articles. 2001. Issue 69. P.86-91 (ukr).

Khotnyanska, O.V., Oveckyy, S.O. Vyznachennya efektyvnosti aktyvnogo protylyodovogo zahystu naftogazovyh morskyh stacionarnyh platform (Determination of efficiency of active anti-icing protection of oil offshore fixed platforms). Scientific announcer of Ivano-Frankivsk national technical university of oil and gas. 2009. № 4. P.71-76 (ukr).

Kopey, B.V., Yarynovskyy, M.G. Rozrahunok micnosti morskkyh stoyakiv pry diyi zovnishnih navantagen’, vnutrishnyogo tysku ta temperaturnogo rozshyrennya (Calculating the strength of marine risers by the action of external loads, internal pressure and thermal expansion). Scientific announcer of IFNUOG. 2013. № 1(34). P.105-110 (ukr).

Korniyenko, M.V., Permyakov, V.O.,Sveshnikov, O.H., Klyuchka, I.O. Osoblyvosti vplyvu seismichnogo navantagennya na kryhostiyki morski stacionarni platformy (Peculiarities of impact of seismic load on ice-resistant offshore fixed platforms). Collection of scientific articles (industrial ingineering, construction). 2005. Issue 15. P.109-114 (ukr).

Myitsuk, S.V., Ostapenko, R.M., Kuzmin, B.V. Osoblyvosti rozrahunku paluovyh opor morskyh stacionarnyh platform na seismichni vplyvy (Peculiarities of the calculation of the pile supports of sea stationary platforms on seismic influences). Strength of Materials and Theory of Structures: Scientific-and-technical collected articles. 2016. Issue 97. P.214-224 (ukr).

Birbraer, A.N. Raschyot konstrukcyy na seismostoykost (Seismic analysis of structures). StPt.: Nauka, 1988. 256 p. (rus).

DBN V.2.4-3:2010. Hidrotehnichni sporudy (Hydrotechnical structures). [Valid since 2011-01-01]. Edit. offic. Kyiv: Minregionbud, 2020. 37 p. (ukr).