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지반-파일 상호작용을 고려한 PS 콘크리트 해상풍력 구조물의 거동 해석
김범준,Pasin Plodpradit,배경태,김유석,김현기,김기두 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.1
The concrete gravity base structure is not suitable for the weak soil due to heavy self weight. As an alternative, PS concrete offshore wind turbine structure supported with piles was suggested. For the analysis of structure, the environmental conditions of southwest coast in Korea and 5MW wind turbine were applied. The diffraction theory on the 3D finite element was used for wave pressure. To consider the effect of pile foundation on structure, finite element analysis was carried out with soil-pile interaction. In the result, the stresses and displacements of structure were acceptable with the criteria of offshore standard. And, piles had the enough pullout and bearing capacities to endure loads on piles. To evaluate the resonance behavior of the structure, the natural frequency analysis was implemented. As a result, the suggested structure has no resonance and has a stable dynamic characteristic. Thus, it is concluded that the suggested structure can be applied for weak soil, and it is expected to be the solution for offshore wind farm in Korea.
김범준,Pasin Plodpradit,수타수프라딧 송삭,김현기,김기두 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.2
A concrete offshore wind turbine structure supported with suction pile for a weak soil foundation wasproposed, and ship collision analysis was carried out to evaluate the concrete structure with a ship impact load. To take into account the effect of suction pile and soil on the structure, a lumped parameter model was usedto calculate the soil stiffness matrix. As the first step, a linear analysis of the structure was carried out for afeasibility assessment of the designed structure. A 5 MW wind turbine and the environmental conditions of thesouthwest coast of Korea were applied. In a quasi-static analysis, maximum displacements and stresses did notexceed the allowable values from the offshore standard, and it was determined that no resonance occurred ina natural frequency analysis. For the ship collision evaluation, a nonlinear dynamic algorithm of ship collisionwas performed using a nonlinear concrete material model. A ship impact–load time history curve was applied,and maximum displacement and principal stresses were calculated. The principal stresses were not exceeded inthe range of the concrete strength. Thus, damage to the concrete structure by ship collision was small, and ithas enough stability to be applied on the southwest coast of Korea. Consequently, it is expected that theproposed structure can be a good solution for offshore wind farms.
Interface Behavior of Grouted Connection on Monopile Wind Turbine Offshore Structure
김기두,Pasin Plodpradit,김범준,Chana Sinsabvarodom,김성중 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.3
The interface behavior of a concrete grouted connection is studied in a monopile wind turbine offshore structure. The groutedconnection between transition piece and monopile is fixed by filling it with grout materials made of high-strength concrete. Weobserve a nonlinear equilibrium path from the grouted connection in experiments. For comparison with the experimental results,nonlinear finite element analysis of the grouted connection is performed, taking the effects of both material and geometricalnonlinearities into consideration. A finite element model of the grouted connection between the steel and concrete materialsis realistically simulated using an interface element. The finite element results compares well with the experimental results. Thus, the finite element analysis showed that the numerical model based on the interface element is a good method forinvestigating the behavior of grouted connections of monopile offshore structures.
오토캐드 환경에서 구현한 해상풍력 지지구조 해석 프로그램
반석현,마천,서라삭,플롯프라딧 파신,지광습,James Ban,Chuan Ma,Sorrasak Vachirapanyakun,Pasin Plodpradit,Goangseup Zi 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 논문집 Vol.27 No.4
Wind power is one of the most efficient and reliable energy sources in the transition to a low-carbon society. In particular, offshore wind power provides a high-quality and stable wind resource compared to onshore wind power while both present a higher installed capacity than other renewables. In this paper, we present our new program, the X-WIND program well suitable for the assessment of the substructure of offshore wind turbines. We have developed this program to increase the usability of analysis programs for offshore wind energy substructures by addressing the shortcomings of existing programs. Unlike the existing programs which cannot solely perform the substructure analyses or lack pre-post processors, our X-WIND program can complete the assessment analysis for the offshore wind turbines alone. The X-WIND program is embedded in AutoCAD so that both design and analysis are performed on a single platform. This also performs static and dynamic analysis for wind, wave, and current loads, essential for offshore wind power structures, and includes pre/post processors for designs, mesh developments, graph plotting, and code checking. With this expertise, our program enhances the usability of analysis programs for offshore wind energy substructures, promoting convenience and efficiency.