On the Reliability of Offshore Platforms Against Random Sea Waves and Earthquake Motions

by Kenji Kawano, Kagoshima Univ, Japan,
Yoshikazu Yamada, Kagoshima Univ, Japan,
Hirokazu Iemura, Kagoshima Univ, Japan,
K. Venkataramana, Kagoshima Univ, Japan,

Document Type: Proceeding Paper

Part of: Structural Safety and Reliability


Dynamic response of offshore structures to random sea waves and strong earthquake motions is investigated. The wave-structure interaction is represented using the generalized Morison equation whereas the soil-structure interaction is idealized as a simple system of spring-dashpot elements connecting the structure with the subsoil. The dynamic equations of motion are derived by the substructure method and the response analysis is carried out using the frequency-domain random vibration approach. The response quantities are compared using the principles of first passage probabilities across specific barriers. It is shown that the effect of random sea waves is to enhance the reliabilities of offshore structures against seismic loading.

Subject Headings: Random waves | Water waves | Offshore structures | Ocean waves | Structural reliability | Offshore platforms | Earthquakes | Ground motion

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