Multi-Hazard Risk Assessment of an Offshore Structureby B. K. Bhartia, Princeton Univ, United States,
E. H. Vanmarcke, Princeton Univ, United States,
Abstract: This paper develops and illustrates a methodology for multi-hazard modal risk assessment. The case study involves assessing risk to an offshore structure in a load environment consisting of earthquakes and seastorms. The risks, both short-term and long-term, are assessed in function of two limit states defined respectively in terms of the allowable displacement and acceleration at the deck of the structure. A clear distinction is made between the physical and parameter uncertainty present in the system, and the effect of the latter explicitly quantified on the response statistics as well as on risks. The paper also determines the influence of ambient load on the earthquake safety and performs sensitivity analyses.
Subject Headings: Risk management | Offshore structures | Wind loads | Sensitivity analysis | Case studies | Seismic loads | Earthquakes
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