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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

本文从理想结构单元法（ISUM）的推广和动态显式法在拟静力有限元分析（FEA）中的应用两方面探讨了一种有效的船舶结构构件和系统递进破坏分析方法。在ISUM中，结构被离散成可能的最大单元，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被理想化。因此，与有限元分析相比，求解的自由度大大降低，从而减少了计算工作量和时间。主要研究成果如下：(1)对ISUM矩形板单元进行了扩展，使其在考虑推力载荷的同时也考虑了侧向压力；这也使得考虑焊接残余应力对钢板和加强筋的影响成为可能。对某型船舶在纯弯曲条件下的横截面进行了逐级分析，结果表明该方法具有较高的精度和效率。ISUM所需的CPU时间约为FEA的1/70。(2)开发了用于双船体结构连续倒塌分析的ISUM梁单元。通过选择适当的积分点计算刚度矩阵，可以考虑楼板或梁上的切口的影响。对双底结构在均侧压力作用下的递进破坏进行了分析，验证了该模型的有效性和精确性。ISUM所需的CPU时间约为FEA的1/70-1/100。(3)讨论了采用动态显式方法进行准静态有限元分析所需的加载条件。结果表明，该条件是固有周期的函数，对应于类似屈曲模态的固有振动模态。(4)对箱梁试件进行了循环弯曲试验，研究了箱梁板屈曲后低周疲劳开裂的循环破坏行为。试验与ISUM分析的比较表明，ISUM分析的准确性令人满意。少

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