Reliagility Analysis of Tension Leg Platforms for Severe Storm Waves

J. Ocean Eng. Technol. 1991;5(1):16-24.

대규모 폭풍에 대한 Tension Leg Platform의 신뢰도해석

박우선,윤정방

한국해양연구소 해양공학실,한국과학기술원토목공학과

Keywords: Tension Leg Platform, Severe Storm, Liability Analysis, Limit State, First Passage, Expected Domain Crossing Rate

핵심용어: 인장각식 해양구조물, 대규모 폭풍, 신뢰도 해석, 한계상태, 최초초과, 평균초과율

Abstract

This paper presents a method of the reliability analysis for a tension leg platform(TLP)in severe storm waves by using the first passage concept of the random tensile stress in the tendons. In the present method, two failure conditions are considered ;i.e., the exceedance of the ultimate tensile capacity and the occurrence of the negative tension. In order to consider the correlation effects between the failure events for each corner resulted from the rupture of all tencons at one corner, a new system limit state for a rectangular shaped TLP is developed, which is defined in terms of the TLP motions in the vertical plane ;i.e., heave, roll, and pitch. To illustrate the validity of the present method, the numerical analysis is carried out for two TLP's with different structural dimensions. Then, the results are compared with those by other methods.