Derivation of design loads by structural reliability method

Research Project

Project/Area Number	23656549
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Naval and maritime engineering
Research Institution	Osaka University
Principal Investigator	IIJIMA Kazuhiro 大阪大学, 大学院・工学研究科, 准教授 (50302758)
Project Period (FY)	2011 – 2012
Project Status	Completed (Fiscal Year 2012)
Budget Amount *help	¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000) Fiscal Year 2012: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000) Fiscal Year 2011: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords	材料 / 構造力学 / 信頼性工学 / 構造信頼性 / 設計荷重 / 不規則波 / FORM / 複合荷重 / リスク工学 / 曲げ捩り / 崩壊
Research Abstract	First Order Reliability Method (FORM) is adopted to derive irregular wave trains which yield response equivalent to the maximum response at an arbitrary probability level in a period. It is shown that the method is effective in determining the structural design loads for linear/nonlinear response. The method is also applied to the cumulative collapse behavior of a ship’ s hull girder in a short term sea state. It turned out that the most probable severe collapse scenario is the one extreme event rather than a series of extreme waves.