A COMPREHENSIVE STUDY ON THE CONSTRUCTION OF MEGA-FLOATING ARTIFICIAL ISLANDS

大型人工浮岛建设的综合研究

• 批准号: 06302044
• 负责人: WATANABE Eiichi
• 金额: $ 5.76万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302044/
• 关键词: Very Large Floating Structure; Floating Airport; Wind Force; Wave Response Analysis; Earthquake Response Analysis; Elastic Deformation

This study aims at a comprehensive study on the construction of Mega-floating structure such as floating artificial islands. The size of the structure may be several kilo-meters, which may include floating airport.Prof. Nagao studied on the wind resistant design of such a floating structure. In order to clarify it, he performed some experiments on the flat box-sectional models. It has been obtained that the wind force will be significantly affected by the close wind characteristics.Prof. Kitahara analyzed the fluid-elastic foundation-porous ground system subjected to earthquake excitations. The method employed is the Boundary Element Method, and the three domains are separately modeled, and are combined at their boundaries. The numerical results have shown that the submergence of the foundation to the ground will be effective in terms of the reduction of ground stresses.Prof. Funaki studied on large offshore structures moored by catenary lines, and the effect of the weight and stiffness of the catenary lines were examined. The nonlinear effect of the catenary lines are linearized based on the results of transient analysis by ABAQUS.Prof.Ueda studied the floating structure consisting of rectangular and half-circular shapes, and the hydrodynamic forces (diffraction and radiation forces) were analyzed by the source distribution method. The floating bridges were also studied, and the effect of elasticity of the superstructure were examined.Prof.Watanabe and Dr.Utsunomiya studied on the wave response analysis of large floating structure considering elastic deformation of the structure. The fluid and structural domains were both modeled by Finite Element Method, and the direct frequency method has been applied to wave response analysis. The HOBEM (Higher Order Boundary Element Method) program has also been developed, and the VLFS (very Large Floating Structure) has also been analyzed.

本研究旨在对漂浮人工岛等巨型浮式结构物的建造进行综合研究。该结构的大小可能是几千米，其中可能包括浮动机场。长尾研究了这样一种浮式结构的抗风设计。为了阐明这一点，他在平板箱形截面模型上进行了一些实验。结果表明，近距离风特性对风力有很大的影响。北原分析了地震作用下的流体-弹性地基-多孔地基系统。所采用的方法是边界元方法，三个域分别建模，并在其边界处组合。数值结果表明，基础下沉到地面对降低地应力是有效的。Funaki对悬链线系泊的大型海洋结构物进行了研究，考察了悬链线的重量和刚度的影响。根据ABAQUS的暂态分析结果，将悬链线的非线性效应线性化。上田教授研究了由矩形和半圆形组成的浮体结构，并用源分布法分析了水动力(绕射力和辐射力)。渡边教授和宇都宫博士研究了考虑结构弹性变形的大型浮式结构的波浪响应分析。采用有限元方法对流体域和结构域进行了数值模拟，并将直接频率法应用于波浪响应分析。编制了HOBEM(高阶边界元)程序，并对超大型浮体进行了分析。

项目成果

Tomoaki Utsunomiya: "Development of Higher Order BEM Program for Wave Response Analysis of Very Large Floating Structures" Proc.of Civil Engineering in the Ocean. Vol.13. (1997)

Tomoaki Utsunomiya：“用于超大型浮动结构波浪响应分析的高阶 BEM 程序的开发”Proc.of Civil Engineering in the Ocean。

宇都宮智昭: "超大型箱形浮体の波浪応答解析のための高次要素BEMプログラムの開発" 海洋開発論文集. 13(印刷中). (1997)

Tomoaki Utsunomiya：“用于超大型箱形浮体波浪响应分析的高阶单元 BEM 程序的开发”海洋发展论文 13（出版中）。

Tomoaki Utsunomiya: "Wave Response Analysis of a Flexible Floating Structure by BE-FE Combination Method" Proc.of the Fifth Intemational Offshore and Polar Engineering Conference. 400-405 (1995)

Tomoaki Utsunomiya：“利用 BE-FE 组合方法对柔性浮动结构进行波响应分析”第五届国际近海和极地工程会议论文集。

上田茂: "Behavior of Floating Bridge under Wind and Wave Action" Proc.International Workshop on VLFS. (1996)

Shigeru Ueda：“风浪作用下浮桥的行为”Proc.International Workshop on VLFS（1996）。

宇都宮智昭: "弾性変形を考慮した大型ポンツーン浮体の波浪応答特性について" 海岸工学論文集. 42. 961-965 (1995)

Tomoaki Utsunomiya：“考虑弹性变形的大型浮桥浮体的波浪响应特性”海岸工程杂志 42. 961-965 (1995)。