해상풍력 지지구조물은 설치과정에서 수직도 오차가 발생하여 풍력발전기 전체 구조의 안전성이 저하될 수 있다. 따라서, 본 논문에서는 콘크리트 중력식 해상풍력 연결부에서 PS 앵커와 앵커체결구 그라우트를 사용하여 수직도를 조정할 수 있는 방안에 대한 연구를 수행 하였다. 연결부는 5MW급 해상풍력 지지구조물에서 발생한 수직도 오차를 최대 0.5°까지 보정하는 것을 목표로 하였다. 우선, 수직도 조정이 가능한 해상풍력 연결부에 대해 주요 부재별 설계안과 설계절차를 제안하고, 제주도 해상지역을 대상으로 설계 제원을 산출하였다. 그 후, 설계 제원에 대해 비선형 3차원 유한요소해석을 수행하여 설계안의 적정성을 검토하였다. 검토 결과, 하중 전달 메커니즘과 연결부 발생 응력 확인을 통해 제안 설계안은 0.5°의 수직도 오차를 보정하여도 안전하다고 판단하였다.

The transition piece of the offshore wind power support structure transmits the load of the tower stably to the support structure on the lower side. The transition piece of the offshore wind power support structure should solve the stress concentration problem in design. In this paper, in order to solve the stress concentration problem occurring at the transition piece of the offshore wind power support structure, the location and the mitigation of the stress concentration have been studied.

In this study, Integrity evaluation of offshore wind turbine substructure was carried out. The strain values obtained by strain gauges circularly installed on upper part of the substructure was converted into vertical and moment load. Considering directions of the moment load through FEM, the most conservative P-M interaction diagram of the model was graphed. Obtained load values were evaluated by utilizing P-M interaction diagram.

Transition piece of offshore wind turbine tower is one of the main parts which takes the direct load and pass on to the lower support structure. In this study, a new design method for the transition piece has been developed. The trasition piece was designed based on the the load flow which was analyzed by approximation and was evaluated by FEM.

비정형 판 부재의 탄소성 좌굴 강도를 평가할 수 있는 새로운 지표를 제안하였다. 부재 경계면에 작용하는 하중 또는 경계면의 변화 에 따른 외부일 또는 변형에너지를 부재의 평형 변형경로에 따라 계산하고, 이 에너지의 이차 변분량의 부호가 양에서 음으로 바뀌는 시점을 안 정한계로 제안하였다. 판 부재의 단면력을 등분포 또는 선형으로 근사한 상태로 단면력을 사용하여 좌굴한계를 평가하는 현 기법과는 반대로 단면력의 변화가 비선형적인 복잡한 경우에도 간단히 좌굴한계를 평가할 수 있다. 선형탄성 문제에 대해서는 본 기법의 결과와 전통적인 방법 이 동일한 결과를 도출한다.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

In this paper, we research about integrated jacket support structure. The connection of the offshore wind support structure was designed based on the DNV-RP-C201 standard and the design of the appropriate type was derived through numerical calculation and finite element analysis of the stress paths of various connecting part type.

A new index for the buckling strength of non-structured plates is proposed. The traditional method of evaluating buckling strength involves inconsistancies of stress distribution while new method of checking the energy variance always provides consistent and even results in any shape of member or load and boundary conditions.

This study is a part of the research on the development of safety monitoring system and monitoring program of 3MW offshore wind support structure using fiber optic sensor. In this paper, we propose a maintenance system for offshore wind support structure using fiber optic sensor based on the analysis of current monitoring status and related standards of domestic and overseas offshore wind support jacket structures.

Recently, wind turbine industry have received more attention than before. Many countries including South Korea focus on the offshore wind turbine because of its geographical advantage. However, domestic technique level is much lower than that of advanced countries such as Europe. In this study, analysis on development trend of offshore wind turbine and design standard in Europe is carried out to develop the original design standard.

In this research we carried out the compressive strength, modulus of rupture and scaling resistance tests in order to evaluate the durability of concrete pavement containing waste glass powder. As a results of this research, the concretes incorporating 20% waste glass powder had higher compressive strengths and modulus of ruptures than the concretes with 20% fly-ash. Also, they had a better scaling resistance than ordinary portland cement concretes and fly ash concretes.

In this paper, we investigate the pozzolanic reaction of the waste glass sludge incorporating precipitation additives experimentally. The consumption of calcium hydroxide, and the compressive strength were tested for two different types of the waste glass sludge depending on whether precipitation additives were used.