Reliability Assessment of Frame Structures Based on Ultimate Strength Analysis

基于极限强度分析的框架结构可靠性评估

• 批准号: 63550325
• 负责人: OKADA Hiroo
• 金额: $ 1.41万
• 依托单位: The University of Osaka Prefecture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550325/
• 关键词: ship main structure; spatial frame structure; ultimate strength; plastic node method; dominant collapse mode; failure probability; structural reliability; central safety factor; 主要崩壊モ-ド; 有限要素法; 船体縦横骨組構造; 複合荷重; 塑性崩壊; 信頼性評価

1. A system is developed for reliability assessment of spatial frame structures based on ultimate strength analysis. (1) Ultimate collapse is evaluated by using a linearized failure condition of the section under the combined effect of axial force, shearing forces, biaxial bending moment and torsional moment. (2) A plastic node method combined with a finite element method is used to generate the safety margins of ultimate collapse modes. (3) Stochastically dominant collapse modes are selected by applying the so-called branch-and-bound methods combined with heuristic operations.2. The system is successfully applied to ship main structures, which are modelled as spatial frame structures and subjected to various notional loading conditions. Probabilistic properties of ultimate strength of ship main structures are investigated through the numerical examples for a large tanker (240,OOODWT) and comparison with previous results for plane frame models. (See reference 1.)3. The system is also applied to typical plate structures having orthogonal stiffeners as a basic study on ultimate strength analysis of ship bottom platings, which are modelled as plane frames and subjected to combined in-plane compression and lateral pressure. Through numerical examples and comparison with previous researches, the applicability of the proposed methods is demonstrated. (See references 2 and 3.)

1. 提出了一种基于极限强度分析的空间框架结构可靠性评估体系。(1)采用轴力、剪力、双轴弯矩和扭矩共同作用下的截面线性化破坏条件，对其极限破坏进行评估。(2)采用塑性节点法和有限元法相结合的方法计算了极限破坏模式的安全裕度。(3)采用分支定界法结合启发式运算选择随机优势崩溃模式。该系统已成功地应用于船舶主体结构，并将其建模为空间框架结构，承受各种概念荷载条件。通过某大型油轮（240，OOODWT）的数值算例，并与以往平面框架模型的结果进行比较，研究了船舶主体结构极限强度的概率特性。（见参考资料1）并将该系统应用于典型的正交加劲板结构，作为船体底板极限强度分析的基础研究，将其建模为平面框架，承受面内压缩和侧向压力的联合作用。通过数值算例和与前人研究的比较，验证了所提方法的适用性。（参见参考文献2和3。）

项目成果

H. Okada, et al: "A Method for Reliability Assessment of Spatial Frame Structures Based on Ultimate Strength Analysis" Journal of Japan Society of Naval Architects, No. 166, 315-323, 1989.

H. Okada 等人：“基于极限强度分析的空间框架结构可靠性评估方法”，日本造船学会杂志，第 166 期，第 315-323 期，1989 年。

岡田博雄,室津義定,山本浩志: "最終強度解析に基づく立体骨組構造の信頼性評価の一方法" 日本造船学会論文集. 166. 315-323 (1989)

Hiroo Okada、Yoshisada Murotsu、Hiroshi Yamamoto：“基于极限强度分析的三维框架结构可靠性评估方法”日本造船学会汇刊 166. 315-323 (1989)。

岡田博雄 他: 日本造船学会論文集. (1989)

Hiroo Okada 等人：日本造船学会论文集（1989 年）。

H. Okada, et al: "A Method for Ultimate Strength Analysis of Plate Structures under In-Plane Compression and Lateral Pressure" Journal of The Kansai Society of Naval Architects, Japan, No.213 1990.

H. Okada 等人：“平面内压缩和侧向压力下板结构的极限强度分析方法”，日本关西造船学会杂志，第 213 期，1990 年。

H. Okada, et al: "A Method for Reliability Assessment of Ship Bottom Platings Based on Ultimate Strength Analysis" Proc. of 6th Workshop on Reliability, Tottori, 25-34, 1989.

H. Okada 等人：“基于极限强度分析的船底板可靠性评估方法”Proc。