Development and application of the method of collapse behavior of floating structures in large waves

2014 Fiscal Year Final Research Report

• Project/Area Number: 23246150
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Naval and maritime engineering
• Research Institution: Osaka University
• Principal Investigator: FUJIKUBO Masahiko 大阪大学, 工学(系)研究科(研究院), 教授 (30156848)
• Co-Investigator(Kenkyū-buntansha): YANAGIHARA Daisuke 愛媛大学, 理工学研究科, 寄附講座准教授 (10294539) ; OKAZAWA Shigenobu 広島大学, 工学研究科, 准教授 (10312620) ; TANAKA Yoshiteru 独立行政法人海上技術安全研究所, 構造安全評価系, 研究員 (40373419) ; IIJIMA Kazuhiro 大阪大学, 工学研究科, 准教授 (50302758) ; TATSUMI Akira 大阪大学, 工学研究科, 助教 (60736487)
• Project Period (FY): 2011-04-01 – 2015-03-31
• Keywords: 船体構造 / 浮体式海洋構造物 / 波浪中崩壊挙動 / 安全性評価 / 水槽試験 / 流体構造連成 / 理想化構造要素法

Outline of Final Research Achievements

For the purpose of structural safety assessment of ships and floating offshore structures in large waves, two methods of collapse analysis of floating structures in waves considering the interaction among motions, fluid behaviors and structural deformation were developed. One is the simplified method based on the one-dimensional beam model and the other the more refined method based on the Idealized Structural Unit Method (ISUM). Collapse tests were performed in wave tank using the models designed so that the longitudinal bending collapse behavior is equivalent to that of proto-type ships. The developed methods of collapse analysis were validated through a comparison with the tank test results. A series of collapse analyses was performed to clarify the characteristics of collapse behavior of floating structures in large waves including the effect of time duration of applied loads on the collapse extent.

Free Research Field

船舶海洋工学