【作者】 徐宝；

【导师】 丁红岩；

【作者基本信息】 天津大学 ， 结构工程， 2007， 硕士

【摘要】 筒型基础结构产生于二十世纪九十年代的挪威,由挪威国家石油公司研制成功,并开始应用于工程实践。筒型基础具有减小工程量、节省投资、缩短施工时间、可重复使用等优点,在某些领域正在逐步替代桩基和重力式基础。目前国内对筒型基础附加质量系数的研究还不够成熟,完善其理论和计算方法具有重要的理论意义和工程实践价值,可为我国海洋平台筒型基础结构的应用提供理论依据和技术支持。本文的目的是分析筒型基础结构自由运动和拖航运动时的附加质量系数,主要采用模型试验的方法来进行研究。以常规浮体的浮态和稳性分析的方法和理论为基础,本文分析研究了筒型基础结构的气浮理论和附加质量理论。本次试验为国内首次进行的筒型基础结构模型拖航试验。本文根据试验过程中测出的结构运动的加速度和筒内压力等参数,求出了筒型基础结构自由运动和拖航运动中的附加质量系数,并进行了分析,得出了一些结论:筒型基础模型结构的入水深度越大,自由运动时的附加质量系数也越大;倾斜角和托航点不会对结构拖航运动时的附加质量系数造成影响;拖航方向、拖航速度、结构的入水深度以及波浪等因素对结构拖航运动时的附加质量系数造成影响。本文所取得的研究成果对于筒型基础结构的计算和设计具有重要的指导作用,同时为以后开展筒型基础结构原型拖航试验奠定了基础。更多还原

【Abstract】 Bucket foundation structure (BFS) was developed and used by Norway Statoil, which was born in Norway in nineties. BFS is replacing pile foundation and gravity foundation in some aspects because it has some advantages, such as reducing engineering work, saving investment, shortening construction time and iterative use. But until now, the study on the added mass coefficient of BFS is not enough, so it is significant to keep on the study to perfect the theory and design, which can provide the academic gist and technical support for the application of BFS.This article is to analyze the added mass coefficient of BFS. The model test way is mainly used in the article.This paper studies the air floating theory and added mass theory of BFS on the basis of the analytical method and theory of general float structure.This test was the first model BFS towing test in China. Based on the data measured in the test such as the acceleration of the BFS, the pressure in the buckets and so on, this paper figures out the added mass coefficient of BFS and does some analyze. The conclusions are as follows: the deeper of the depth of the bucket in the water, the larger of the added mass coefficient when the BFS is in free movement; the tilt angle and the towing position won’t affect the added mass coefficient when the BFS is towed; the towing direction, the towing velocity, the depth of the bucket in the water and the waves can influence the added mass coefficient.The fruit in this paper has great guidance on the computation and design of BFS, at the same time it has established a foundation of true BFS towing test for the future.更多还原