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ASPECTS OF VULNERABILITY ASSESSMENT CONSIDERING OFFSHORE STRUCTURAL PROGRESSIVE DAMAGE
Abstract
A leading cause for offshore decommissioning is connected with assessment of increasing level of risk due to progressive structural damage and danger potential, in both structural and technological collapse, taking into account the environmental conditions and operational loads for which structure undergoes. The purpose of this paper is to express the vulnerability due to fatigue phenomenon of structural elements - studied on a model corresponding to self lifting Romanian offshore platform "Gloria" - as annual yield probability depending on the sea state. The structure response was determined by probabilistic spectral analysis. Local stresses are calculating through time integration method and the use of Kellogg stress concentrator factors. Degradation evaluation due fatigue is performed using the calculus program MIRA- Fatig developed by the authors, program that uses AWS-X, modified AWS-X, BS-F and S-N curves conjugate with Palmagren - Miner rule. The results of this study show a predominance of fatigue degradation due to low and medium sea states.
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