Structural reliability analysis of offshore structure at cold region

J. Ocean Eng. Technol. 1997;11(3):8-19.

저온해역에서의 해양구조물에 대한 구조신뢰성 해석

이주성

울산대학교 조선해양공학부

Keywords: Structural Safety, Reliability Analysis, Extended Incremental Load Method, Tension Leg Platform, TLP, Cold Region, Reliability Index

핵심용어: 구조적 안전성, 산뢰성 해석, 확대하중증분법, 저온해역, 신뢰성 지수, 파괴확률, 허요안전성 수준

Abstract

In this study an adequate type of offshore structure at the Sakhalin region as cold region is proposed and its structural design results are presented based on the reliability analysis. Structural safety assessment has been carried out for the proposed offshore structure at the Sakhalin area as designed by the reliability method. And a rational design procedure is presented based on the reliability analysis. Followings are drawn through the present study : - Four colum TLP structure is proposed as an adequate offshore structure type at the cold region like the Sakhalin region and the reliability-based structural design results are presented. It is seen that the proposed type is a more adequate and economic than the fixed type. - Safety assessment of the proposed structure applying the extended incremental load method is performed. - Referring the allowable safety level for offshore structures it has been found present TLP structure has sufficient structural safety at the system level as well as at the component level.