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Development and Initial Planning of a New Type Structure for Ocean Space Utilization of Middle Water Professor

新型中水教授海洋空间利用结构的开发与初步规划

基本信息

批准号：
63850092
负责人：
YOSHIDA Koichiro
金额：
$ 17.28万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B).
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

Development and fundamental confirmation of structural engineering feasibility of ocean business city complex with population of 30,000 daytime people by using structures in middle waters of 30 to 70 m depth were aimed in this study. The site for construction of this business city complex is assumed to be laid off Tsu city in the Ise Bay. In order to produce the business space at this site, a semisubmersible type of ring-like structure with outer diameter of 1,000 m and inner diameter of 800 m was developed. This ring-like structure is fixed to the sea bed by using concrete supporting structures at the several points.First of all, the meteorological data of the Ise Bay were collected and the maximum expected values were estimated statistically. The wind tunnel tests with a small scale model were carried out to evaluate wind and current forces. A 3D source distrubution method taking wave interaction effects into account was developed for wave force evaluation. The time history of accele … More ration of the E1 Centro earthquake was adopted to evaluate the earthquake responses.The responses to wind and current forces were assumed to be stationary. On the other hand, the responses to wave forces and to earthquake waves were analyzed in the frequency domain and in the time domain, respectively. The results obtained from these response analysis were compared with the design criteria on stress and acceleration initially adopted and it was confirmed that the design proposed in this paper was feasible from the structural engineering view point.In this design, a special type of mechanical connection system between the semisubmersible type of ring-like structure and the concrete supporting structure is adopted, which has such a function that both structures are almost rigidly connected in usual condition, while the connection is released in the severe earthquake case.Finally, it was shown by optimization of the proposed structural system that the number of the supporting structures can be reduced to three. Less

本研究的目的是利用30至70 m深的中层水域结构开发和基本确认白天人口为30,000人的海洋商务城市综合体的结构工程可行性。这座商业城市综合体的建设地点预计位于伊势湾津市附近。为了在该地点生产商业空间，开发了外径1,000 m、内径800 m的半潜式环形结构。这个环状结构通过在几个点处使用混凝土支撑结构固定在海床上。首先，收集伊势湾的气象数据并统计估计最大期望值。使用小比例模型进行风洞试验以评估风力和水流力。开发了一种考虑波浪相互作用效应的 3D 源分布方法来评估波浪力。采用 E1 Centro 地震的加速度时程来评估地震响应。假设对风和水流的响应是平稳的。另一方面，分别在频域和时域中分析了对波浪力和地震波的响应。将这些响应分析得到的结果与最初采用的应力和加速度设计准则进行比较，证实了本文提出的设计从结构工程的角度来看是可行的。在本设计中，半潜式环状结构与混凝土支撑结构之间采用了一种特殊类型的机械连接系统，其作用是在正常情况下两个结构几乎刚性连接，而在工作状态下则释放连接。最后，通过对所提出的结构体系的优化表明，支撑结构的数量可以减少到三个。较少的