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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

基本信息

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

项目摘要

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.开发了一个基于极限强度分析的空间框架结构可靠度评估系统。(1)在轴力、剪力、双向弯矩和扭矩的联合作用下，采用截面的线性化破坏条件计算极限破坏。(2)采用塑性节点法和有限元法相结合的方法来确定结构极限破坏模式的安全裕度。(3)采用分支定界法结合启发式操作选择随机主导的倒塌模式.该系统已成功地应用于船舶主结构，这是模拟为空间框架结构，并受到各种名义载荷条件。通过对一艘24万吨大型油船的算例分析，并与已有的平面刚架模型计算结果进行比较，研究了船舶主结构极限强度的概率特性。(See参考文献1.）3.该系统也适用于典型的板结构，正交加劲肋作为船舶底板的极限强度分析的基础研究，这是模拟为平面框架，并受到组合面内压缩和侧压力。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. (See参考文献2和3）。