A floating concrete pontoon is at high risk for damage and fatigue because of exposure to the marine environment loads. In this study, the dynamic properties of the structure are extracted by field test, and the stiffness of the structure is estimated through a system identification method. In addition, the stress distribution of the structure is determined by the wave loads, and the fatigue damage induced by each wave load are calculated using the estimated stiffness and DNV-code based S-N curve.

The purpose of this study is to estimate structural integrity evaluation of the concrete pontoon structure when the boundary condition and time changes. The structural integrity evaluation is conducted through the system identification method using dynamic properties. Dynamic properties are extracted with the structures when it is located on the ground and submerged in the sea. The variation of the structural stiffness due to a certain period time is discussed.

The marine structures vibrate due to waves, current and wind load. Therefore, the marine structures is needed to evaluate the vibration usability for health and comfort of the user. In this paper, the vibration usability evaluation applying to the ISO 2631-2 and ISO 6954 standard was performed and discussed.

본 논문은 구조물의 동적특성인 모드형상과 고유진동수를 이용한 손상탐지와 유효 물성치 추정을 통하여 콘크리트 축소모형과 실제 콘크리트 부유식 구조물 함체의 건전성을 평가하였다. 손상탐지의 경우 콘크리트 축소모형에 대한 동적실험을 수행하여 모드형상을 추출한 후 손상탐지기법에 적용하여 실용성을 증명하였다. 또한 실제 콘크리트 부유식 구조물 함체의 모드형상 및 고유진동수를 실험을 통하여 구한 후 구조계추정기법을 이용하여 콘크리트의 유효 물성치를 추정하였다. 손상탐지기법을 이용하여 축소모형의 손상부재를 정확히 찾아내었으며, 구조계추정기법을 이용하여 실제 콘크리트 부유식 함체의 현재 유효 물성치를 추정하였다.

In this study, we evaluated the long-term properties of long-tern pontoon concrete which has excellent mechanical properties and CO2 reduction effect. The low-carbon pontoon concrete was substituted unit weight of cement partly with ground granulated blast furnace slag to secure the durability and eco-friendly. As a result, the low-carbon pontoon concrete was better long-term properties than plain concrete.