해상풍력발전의 건설이 여러 가지 환경 및 가설공법 등의 설치환경 등의 원인에 의하여 건설지점이 천해에서 심해로 이동하는 경향을 나타내고 있다. 이러한 경향 속에 해상풍력발전 지지구조물의 심해화에 따른 지지구조물에 대한 연구는 중요성이 더욱 증대될 것으로 판단된다. 본 연구에서는 기존의 Jacket 구조물에 대하여 Precast Concrete Block 및 Suction pile을 적용한 Jacket 구조물을 제안하고 이에 대하여 구조해석 및 안전성 평가를 실시하였다. 또한 제안된 구조물에 동조액체감쇠기를 적용하여 구조물 진동성능 향상을 도모하고자 하였다. 연구결과, 제안된 신형식 Jacket 구조물은 충분한 안전성을 가지고 있는 것으로 평가되었으며, 동조액체감쇠기를 적용하였을 경우, 약 5%의 진동저감 효과가 있는 것으로 검토되었다.

The map crack occurred in the concrete barrier and this crack is caused by the Alkali—Silica Reaction. As a result of the collision analysis according to the damage of the barrier, the barrier was found to be below the reference of structural performance when the crack height was 50cm or more. In the case, improvement is considered necessary.

In this study, collision analysis of overlay concrete median barrier under truck load was conducted depending on location of rebar and shear key. Obtained results indicates that the impact resistances of overlay concrete median barrier was improved as the rebar and shear keys are more closed to the top surface of the CMB.

Recently, the velocity of vehicle in highway has been increased due to improved driving environment. Unfortunately, the impact resistance of present concrete median barrier is not enough for increased impact severity due to increased velocity, furthermore, these increased velocity occurs another secondary accidents due to the concrete fragmentation. Therefore, in this study, the evaluation of impact resistance for developed concrete median barrier was performed with shock absorber.

The dynamic loads such as wind and wave loads are consistently applied to the offshore structure. These dynamic loads affect to the safety and the durability of offshore structure. Tuned Liquid Damper (TLD) was applied to control the vibration of an offshore structure due to dynamic loads. The target structure is jacket structure with PC House for 5-MW offshore wind turbine.