A Study on Ultimate Strength of Ship Hull Girder under Slamming

砰击作用下船体梁极限强度研究

• 批准号: 10650904
• 负责人: OKADA Hiroo
• 金额: $ 2.3万
• 依托单位: Osaka Prefecture University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650904/
• 关键词: Stiffened plate panels; FEM-aided Smith's method; Ultimate collapse of ship hull girder; Structural reliability; Idealized structural unit method; Progressive collapse; Hydro-elasticity and; or hydro-plasticity; 船体縦曲げ強度; 水塊の衝突現象; 最終強度; モンテラルロシミ

(1) First, this study deals with estimation methods for the ultimate strength and post ultimate behavior of ship stiffened plate structures under in-plane combined loads using finite element method considering elasto-plastic large deflection effects. Collapse mechanisms of stiffened structures are mainly classified into two collapse modes. One is the overall buckling mode, which means collapse of both stiffeners and panels. And another is local bucking mode, which means collapse of panels or stiffeners locally. To analyze these modes and their interactions, analyzed region is decided in this study. Satisfying the boundary continuity between adjacent structures under combined loads, Multi-freedom Dependent Constraint Method is applied for boundary condition.(2) Next, this study deals with collapsing behavior and reliability analysis of ship hull girder under longitudinal bending moment. A simplified estimation method is presented for collapsing behavior of ship hull girder under longitudinal bending by using Smith's method. Stress-strain curves of rectangular panels, which are used in Smith's method, are obtained from numerical database based on finite element method considering large deflection and elastic-plastic behavior. This method is applied to reliability analysis and statistical values such as standard deviation and reliability indexes are investigated by Monte Carlo simulation and sensitivity analysis.(3) Finally, a system is developed for collapsing behavior analysis of ship hull girders under extreme wave loads using a method combined with hydrodynamic force analysis and finite element analysis. The applicability of the system is also investigated through numerical examples applied to a basic box-type girder under extreme wave loads.

(1)首先，本文研究了考虑弹塑性大挠度效应的有限元方法在面内联合荷载作用下船舶加筋板结构极限强度和极限后行为的估算方法。加筋结构的倒塌机理主要分为两种倒塌模式。一种是整体屈曲模式，这意味着加强筋和壁板都会坍塌。另一种是局部屈曲模式，即壁板或加劲肋局部倒塌。为了分析这些模式及其相互作用，本研究确定了分析区域。在满足相邻结构在联合荷载作用下边界连续性的前提下，采用多自由度相关约束方法作为边界条件。(2)研究了船体梁在纵向弯矩作用下的倒塌行为及可靠性分析。利用Smith方法，提出了船体梁在纵向弯曲作用下倾覆性能的简化估算方法。在考虑大挠度和弹塑性的情况下，从有限元数值数据库中获得了Smith方法中使用的矩形壁板的应力-应变曲线。将该方法应用到可靠性分析中，通过蒙特卡罗模拟和灵敏度分析，对标准差和可靠性指标等统计值进行了分析。(3)最后，采用水动力分析和有限元分析相结合的方法，开发了船体大梁在极端波浪载荷作用下的倒塌行为分析系统。通过对一基本箱形梁在极端波浪荷载作用下的数值算例，研究了该系统的适用性。

项目成果

正岡,吉岡,岡田,上田: "複合荷重をうける船体防焼板構造の崩懐挙動解析法" 関西造船協会誌. 232(発表予定). (1999)

Masaoka、Yoshioka、Okada、Ueda：“复杂载荷下船体防火板结构的倒塌行为分析方法”，关西造船协会杂志 232（待出版）。

K.Masaoka, H.Okada and et al.: "Ultimate Strength and Its Structural Reliability Analysis of Ship Longitudinal Bending Using Numerical Database"Journal of the Kansai Soc.of Naval Architects, Japan. No.233. 115-121 (2000)

K.Masaoka、H.Okada 等：“利用数值数据库进行船舶纵向弯曲的极限强度及其结构可靠性分析”日本关西造船学会杂志。

佐野淳,池淵哲朗,岡田博雄: "構造と流体の連成を考慮した水塊の衝突現象に関する基礎的研究"関西造船協会 平成13年度春季講演会. (発表予定)(未定). (2001)

Jun Sano、Tetsuro Ikebuchi、Hiroo Okada：“考虑结构与流体相互作用的水团碰撞现象的基础研究”关西造船协会春季讲座 2001 年。（演示预定）（待定）（2001 年）。

河辺,正岡: "一般商船の波浪の目視観測精度と波浪荷重について" 日本造船学会論文集. 183. 123-131 (1998)

Kawabe, Masaoka：“关于一般商船波浪和波浪载荷的目视观测精度”，日本造船学会汇刊 183. 123-131 (1998)。

K.Masaoka,H.Okada,Y.Ueda: ""A Rectangulan Plate Elenent"for Ultimate Strength Aralysis" Proc. of Thim-Walled Structures. 2. 469-476 (1998)

K.Masaoka、H.Okada、Y.Ueda：“用于终极强度分析的“矩形板元素””Proc。