해양 스틸 자켓의 강도에 관한 다양한 보강재효과

초록

Due to a long period exposure to sever environment and a corrosion caused by impant from berthing and mooring, offshore structures can be damaged and corroded. To replace the entire damaged members would implicate a great cost and a technical difficulty. In the study, the effect of various stiffeners on damaged section is investigated. The stress of surrounding members are checked with a stiffener attached to comfirm the allowable stength of the structure. The specific diagonal brace is assumed to be damaged. And varous type of stiffeners are applied to obtain the minimum allowable strength of the surrounding members. The offshore jacket which was installed in Vietnam South Chia Sea is used for the study. The loading conditions of that particular area are applide. The API code is applide to decide the allowable strength of jacket. A FEM pregram is used to investigate the effect of stiffeners on the structure. The K-brace and diagonal brace members are particularly investigated to find the optimum stiffener position and size. The results show that stiffeners can be effectively applied to the damaged and weak areas to improve the strength of surrounging members.