Development of Structural Design System of Large-Scale Offshore Structures by the Adaptive

大型海洋结构物自适应结构设计系统开发

• 批准号: 10555345
• 负责人: TOI Yutaka
• 金额: $ 7.49万
• 依托单位: University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 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/en/grant/KAKENHI-PROJECT-10555345/
• 关键词: Offshore Structure; Framed Structures; Nonlinear Dynamics; Adaptive Method; Structural Design; Ultimate Strengh; Plasticity; Buckling; 動的非線型解析

Offshore structures as frontal bases of ocean developments are designed as space framed structures, as they have advantages in structural strength against wave and wind forces. The use of computational systems for the analysis and design of space frames of structural integrity is inevitable in order to assure the safety of large-scale framed structures in severe environments including earthquakes and collisions. The finite element codes for frame analysis have been used, however, the computational efficiency for inelastic analysis is not high enough for a daily use for the initial design. The head researcher proposed a new computational method identified as the Adaptively Shifted Intenration Technique (abbreviated to the ASI technique) to considerably increase the computational efficiency of the nonlinear finite element analysis of framed structures. The ASI technique has been applied to the plastic collapse, elasto-plastic buckling and dynamic collapse analysis of various framed struc … More tures.The purpose of the present study is to develop the analysis and design system applicable to actual offshore structures, based on the results of the above-mentioned basic research. The main results are (1) the development of the method of finite element crash analysis of framed structures using the ASI technique and its validation, (2) the development of the method of mesh size-independent, elasto-plastic damage analysis of framed structures and its validation. In (1), the method of dynamic crash analysis has been proposed, using the LCL model composed of a cubic beam element based on Bernoulli-Euler hypothesis and two linear Timoshenko beam elements. In (2), the method of elasto-plastic damage analysis has been proposed, using a new damage evolution equation expressed in terms of a plastic rotational angle. Both are the advanced forms of the conventional ASI technique. Their computational efficiency and accuracy have been demonstrated through lots of numerical examples. They are expected to become powerful computational tools for the structural analysis and design of various large-scale framed structures including offshore structures. Less

作为海洋开发前沿基础的海洋结构物被设计为空间框架结构，因为它们在抵抗波浪和风力的结构强度方面具有优势。为了保证大型框架结构在地震和碰撞等恶劣环境下的安全性，空间框架结构的整体性分析和设计必须采用计算系统。框架分析的有限元程序已被使用，然而，非弹性分析的计算效率不够高，日常使用的初始设计。首席研究员提出了一种新的计算方法，称为自适应转移强度技术（简称ASI技术），大大提高了框架结构非线性有限元分析的计算效率。将ASI技术应用于各种框架结构的塑性倒塌、弹塑性屈曲和动力倒塌分析， ...更多信息 本研究的目的是在上述基础研究成果的基础上，开发适用于实际海洋结构物的分析和设计系统。本文的主要成果是：（1）建立了基于ASI技术的框架结构有限元碰撞分析方法，并对其进行了验证;（2）建立了与网格尺寸无关的框架结构弹塑性损伤分析方法，并对其进行了验证。在（1）中，提出了使用由基于Bernoulli-Euler假设的立方梁单元和两个线性Reynshenko梁单元组成的LCL模型进行动态碰撞分析的方法。在（2）中，提出了用塑性转角表示的损伤演化方程进行弹塑性损伤分析的方法。两者都是传统ASI技术的高级形式。大量的数值算例表明了它们的计算效率和精度。它们有望成为包括海洋结构物在内的各种大型框架结构的结构分析和设计的强有力的计算工具。少

项目成果

Yutaka Toi, Jeoung-Gwen Lee and Hiroshi Ioku: "Element-Size Independent, Elasto-Plastic Damage Analysis Framed Structures"Transactions of the Japan Society of Mechnical Engineers. Vol.67, No.653. 8-15 (2001)

Yutaka Toi、Jeoung-Gwen Lee 和 Hiroshi Ioku：“单元尺寸独立弹塑性损伤分析框架结构”日本机械工程师学会会刊。

Yutaka Toi and Jeoung-Gwen Lee: "Finite Element Crash Analysis of Framed Structures by the ASI Technique"Transactions of SMiRT-15. Vol.II. 217-224 (1999)

Yutaka Toi 和 Jeoung-Gwen Lee：“采用 ASI 技术对框架结构进行有限元碰撞分析”SMiRT-15 交易。

Daigoro Isobe,Yutaka Toi: "Analysis of Structurally Discontinuous Reinforced Concrete Building Frames Using the ASI Technique"Computers and Structures. Vol.76,No.4. 471-481 (2000)

Daigoro Isobe、Yutaka Toi：“使用 ASI 技术分析结构不连续的钢筋混凝土建筑框架”计算机和结构。

Ytaka Toi,Jeoung-Gwen Lee: "Finite Element Crash Analysis of Framed Structures by the Adaptively Shifted Integration Technique"JSME International Journal, Series A. Vol.43,No.3. 242-251 (2000)

Ytaka Toi、Jeoung-Gwen Lee：“采用自适应平移集成技术对框架结构进行有限元碰撞分析”JSME 国际期刊，A 系列，第 43 卷，第 3 期。

李廷権,都井裕: "ASI法による骨組構造体の衝撃破断挙動の有限要素解析"生産研究. 第52巻,第8号. 329-333 (2000)

Tingquan Lee、Yutaka Toi：“使用 ASI 方法对框架结构的冲击破裂行为进行有限元分析” Production Research，第 52 卷，第 8. 329-333 期（2000 年）。