초록
To reduce capital expenditures for offshore wind farms, new concepts of support structures have been suggested. Floated gravity base structures (GBSs), which use the buoyancy of the structure instead of using heavy lift vessels during the transport and installation process, are receiving much attention. The main difference between the floated GBS and conventional structures is a design based on floating stability. A floated GBS should maintain floating stability on its own until it is lowered onto the seabed. Therefore, the concept design of the floated GBS is derived to satisfy the minimum metacentric height of 0.75 m during the lowering operation in the installation. As floated GBSs are ballasted with sea water during installation, free surface effects and bulkheads are also taken into account. In regard to the model with a conical base, designs with minimum weights are presented by varying the batter angle of the base. In addition, the maximum load at the bottom of each design is analyzed to assess the bearing capacity of floated GBSs. Although the weight of the floated GBS is minimized at a batter angle of 0°, a batter angle larger than 30° is recommended in consideration of the bearing capacity.
키워드
부체형 중력식 기초, 정적 복원성, 지지력, 개념설계
참고문헌(20)
-
[보고서] Korean Ministry of Trade / 2017 / Renewable Energy 3020 Implementation Plan
-
[학술지] Esteban, M. D. / 2015 / Gravity Based Support Structures for Offshore Wind Turbine Generators: Review of the Installation Process / Ocean Engineering 110 : 281 ~ 291
-
[학술대회] Karal, P. J. / 2015 / Gravity Foundations - the new normal / Offshore Wind Structures 2015
-
[학술대회] Overbeeke, S. / 2017 / Reinforced concrete Gravity Base Foundations, Blyth Project, England / Presentation KIVI
-
[학술대회] Jung, M. / 2017 / Floating Stability During Installation of Gravity Base Structures, OMAE-2017-62287 / OMAE 2017
-
[단행본] Carbon Trust / 2015 / Offshore Wind Industry Review of GBSs
-
[단행본] Journeee, J. M. J. / 2001 / Offshore Hydromechanics
-
[학술지] Padmanabhan, B. / 1996 / Setdown of a Catenary-moored Gravity Platform / Marine Structure 9 (7) : 721 ~ 741
-
[학술지] Attari, A. / 2016 / Design Drivers for Buoyant Gravity-Based Foundations / Wind Energy 19 (10) : 1833 ~ 1844
-
[단행본] Biran, A. / 2014 / Ship Hydrostatics and Stability / Butterworth-Heinemann
-
[기타] DNV GL / 2016 / Support Structures for Wind Turbines, Appendix G, DNVGL-ST-0126
-
[단행본] GL Noble Denton / 2015 / Guidelines for Concrete Gravity Structure Construction & Installation, 0015/ND
-
[학위논문] Smaling, H. / 2014 / Hydrodynamic Loading on the Shaft of a Gravity Based Offshore Wind Turbine
-
[학위논문] Van Wijngaarden, M. J. P. / 2016 / Gravity Based Foundations for Offshore Wind Turbines
-
[기타] IEC / 2009 / Wind Turbines - Part 3: Design Requirements for Offshore Wind Turbines, IEC61400-3
-
[단행본] Vemula, N. K. / 2010 / Design Solution for the Upwind Reference Offshore Support Structure, Deliverable D4.2.5 (WP4: Offshore Foundations and Support Structures), Project UpWind
-
[보고서] KEPRI / 2012 / Test Bed for 2.5 GW Offshore Wind Farm at Yellow Sea Preliminary Design Basis Report
-
[학술지] Oh, M. / 2016 / Load and Structural Analysis of an Offshore Wind-Turbine Foundation with Weight Control Functionality / KEPCO Journal on Electric Power and Energy 2 (3) : 453 ~ 460
-
[학술지] 김범준 / 2017 / 지반-파일 상호작용을 고려한 PS 콘크리트 해상풍력 구조물의 거동 해석 / 풍력에너지저널 8 (1) : 16 ~ 25
-
[학술지] 서민영 / 2017 / 수평방향 하중을 받는 석션파일 기초의 분석 / 풍력에너지저널 8 (1) : 55 ~ 62