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.

This paper investigates the effect of nanomaterials on the piezoresistive sensing capacity of cement-based composites. Carbon nanotube, graphite nanofiber filament, carbon fiber were considered along with a cement composite which is included slicafume. After deriving optimum flowability, cement composites contained carbon materials were made respectively. Then, cyclic compressive test was performed with cement composite that contained 5% of each nano material.

Due to expansion of service environments for the Jack-up barge, the design of the footing has been improved. In this paper, the structure analysis of the modified spudcan based on DNV-OS-C201 examples was assessed.

To calculate back the soil pressure acting on culverts, a technique for estimating the actual soil pressure has been established. The comparison between the design soil pressure and the real soil pressure is included.

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.

Elasto-plastic buckling strength is evaluated based on the procedure given by DNV-RP-C208. To calculate the safety margin of an irregular-shaped steel plates, usage factor in DNV-RP-C201 is modified then used.

We studied design and structural analysis of jack-up barge footing system that can be safely and quickly installed offshore support structure. In this paper, we checked the buckling strength for a structural member in spudcan based on DNV-RP-C201