Progressive Collapse Behavior of Ship Hull and Efficient Method of Its Analysis

船体渐进倒塌行为及其有效分析方法

基本信息

批准号：
16206085
负责人：
FUJIKUBO Masahiko
金额：
$ 14.39万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16206085/
关键词：
Ship Structure Buckling Strength Ultimate Strength Idealized Structural Unit Method Finite Element Method Dynamic Explicit Method Progressive Collapse Behavior Initial Welding Imperfection 縦曲げ最終強度並列処理座屈・塑性崩壊挙動溶接残留応力水圧荷重

项目摘要

An efficient method of progressive collapse analysis of ship structural members and systems was pursued in this study from two different aspects, one is the extension of Idealized Structural Unit Method (ISUM) and the other is the application of dynamic explicit method to quasi-static Finite Element Analysis (FEA). In ISUM, the structure is discretized into possible largest elements and the nonlinear behavior of such elements due to yielding and large deflection is idealized by appropriate shape functions and yielding criteria. The degree of freedom to solve for is therefore significantly reduced compared to FEA, resulting inthe reduction of computational efforts and time. The major achievements in this study can be summarized as follows:(1) ISUM rectangular plate element was extended so that the lateral pressure can be considered as well as the thrust loads. It was also made possible to consider the effect of welding residual stresses both in plate and in stiffener. The progressive co … More llapse analysis of a ship cross section under pure bending was performed, and a good accuracy and an efficiency of ISUM were demonstrated. CPU time required for ISUM was about 1/70 of that for FEA.(2) ISUM girder element for the progressive collapse analysis of double hull structure was developed. The effect of cutouts in the floor or girder can be considered by appropriately selecting integration points for the calculation of stiffness matrices. The progressive collapse analysis of a double bottom structure subjected to uniform lateral pressure showed the efficient and accurate applicability of the proposed ISUM model. CPU time required for ISUM was about 1/70-1/100 of that for FEA.(3) The loading condition necessary for the quasi-static FEA using dynamic explicit approach was discussed. It was shown that the condition is given as a function of natural period corresponding to the natural vibration mode resembling the buckling mode.(4) Cyclic bending test of a box-girder specimen was performed to investigate the cyclic collapse behavior including the initiation of a low cycle fatigue cracking after panel buckling. A comparison between test and ISUM analysis exhibited the satisfactory accuracy of ISUM analysis. Less

本研究从两个不同的方面寻求一种有效的船舶结构构件和系统渐进倒塌分析方法，一是理想化结构单元法（ISUM）的扩展，二是动态显式方法在准静态有限元中的应用在 ISUM 中，结构被离散化为可能的最大单元，并且这些单元由于屈服和大挠度而产生的非线性行为通过适当的形状函数和屈服准则进行理想化。要求解的自由度为。因此，与有限元分析相比，减少了计算量和时间，本研究的主要成果可概括如下：（1）扩展了ISUM矩形板单元，以便可以考虑侧向压力。还可以考虑板和加强筋中焊接残余应力的影响，对纯弯曲下的船舶横截面进行渐进式塌陷分析，ISUM 具有良好的精度和效率。被演示了。CPU时间ISUM所需的计算量约为FEA的1/70。(2)开发了用于双壳结构渐进倒塌分析的ISUM梁单元。通过适当选择积分点可以考虑楼板或梁中切口的影响。受均匀侧向压力作用的双层底结构的渐进倒塌分析表明，所提出的 ISUM 模型所需的 CPU 时间约为 1/70-1/100。 (3) 讨论了使用动态显式方法进行准静态有限元分析所需的载荷条件，结果表明，该条件是与类似于屈曲模式的固有振动模式相对应的固有周期的函数。 4）对箱梁试件进行循环弯曲试验，以研究循环倒塌行为，包括面板屈曲后低周疲劳裂纹的引发。试验与 ISUM 分析的比较表明，ISUM 分析的精度令人满意。

项目成果

期刊论文数量（26）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Progressive Collapse Analysis of Ship's Hull Girder in Longitudinal Bending Using Idealized Structural Unit Method

DOI：
10.2534/jjasnaoe.1.187
发表时间：
2005
期刊：
影响因子：
0
作者：
M. Fujikubo;Zhiyong Pei
通讯作者：
M. Fujikubo;Zhiyong Pei

Applicability of Explicit Dynamic Method to Quasi-Static Analysis of Plates

显式动力学方法在板准静态分析中的适用性

DOI：
发表时间：
2005
期刊：
Proceeding of Conference of Japan Society of Naval Architecture and Ocean Engineers Vol.2W
影响因子：
0
作者：
千賀英敬;小寺山亘;今石大輔;Ken MOTOKURA;Shigenobu Okazawa et al.
通讯作者：
Shigenobu Okazawa et al.

Development of ISUM Plate Element Considering Lateral Pressure Effects and Its Application to Stiffened Plates

考虑侧压效应的ISUM板单元的研制及其在加筋板中的应用

DOI：
发表时间：
2005
期刊：
西部造船会会報 109
影响因子：
0
作者：
Ishihara;D. ; Wada;T. ; Onaka;T;; Matsuhara;H. ; Kataza;H. ; Ueno;M. ; Fujishiro;N. ; Kim;W. ; Watarai;H. ; Uemizu;K. ; Murakami;H. ; Matsumoto;T. ; Yamamura;I.;Masahiko Fujikubo
通讯作者：
Masahiko Fujikubo

理想化構造要素法による船体の縦曲げ逐次崩壊解析

理想化结构单元法船体垂直弯曲连续倒塌分析