【作者】 杨俊超；

【导师】 何林；

【作者基本信息】 哈尔滨工业大学 ， 工程力学， 2008， 硕士

【摘要】 悬浮隧道是用于跨越深水域的交通结构,它利用管段自重、浮力和支撑系统形成平衡体系,并悬浮在水中一定深度。鉴于悬浮隧道所处深水环境,一旦破坏将产生灾难性后果,因此,本文在国家自然科学基金(50508012、50538030)和黑龙江省博士后科研启动基金(LBH-Q06065)的支持下,对悬浮隧道管段与支撑索的应力进行了详细分析,提出了管段健康监测的测点区域确定方法。本文利用DIANA软件的实体单元、壳和杆单元,分别模拟悬浮隧道的海底基础、管段和支撑结构,对悬浮隧道结构体系进行三维数值模拟,分析了结构内力、位移分布规律,获得了悬浮隧道管段监测测点区域的选择方法,为悬浮隧道维修、养护与管理提供决策和力学依据。论文完成的主要工作如下:1.详细综述了悬浮隧道国内外研究现状,归纳总结了悬浮隧道安全监测理论及可靠性研究所面临的挑战,提出了本文的主要研究内容。2.对悬浮隧道所受环境荷载进行简化,将定常流对悬浮隧道的作用简化为静荷载。3.利用DIANA计算工具,分析了悬浮隧道管段应力分析有限元模型关键参数的选择及其处理方法。4.对不同工况下悬浮隧道管段、锚索的力学性能进行了详细计算和分析,确定了管段健康监测的测点区域,并对监测方案进行了仿真设计。最后,对论文所作研究进行总结,并对今后的研究目标和任务提出了展望。更多还原

【Abstract】 Submerged floating tunnel (SFT) is a structure which is used in the traffic field of deep water areas, such as lake, strait, fjord and other appropriate waterways. It suspends in deep water by the balance of gravity, buoyancy and the aid of a supporting sub-system and forms a load balance system ultimately. Considering of the effect of deep water environmental loads, a small damage may result in disastrous accidents to SFT. Therefore, investigation and research, which sponsored by NSFC (Grant No. 50508012 and 50538030) and Heilongjiang Post-doctor Research Funding (Grant NO. LBH-Q06065), were fulfilled to analyze SFT pipe segment stress and strain status and their distribution in pipe segment of SFT. The research work also included the exploration of how to determine the appropriate areas of monitoring points and established the effective and available monitoring method.This paper utilizes solid element, shell element and truss element of DIANA to simulate respectively for anchor foundation at the sea bottom, the SFT pipe segment and the supporting system. By detailed analyzing the structural internal stress and displacement distribution law of SFT pipe segment, we obtains the method of measured points selection which implements in the process of SFT structure health monitoring system. This procedure is especially benefited for repairing, maintenance and managing for SFT. Finally, its monitoring scheme is proposed and analyzed, which will be useful in the design and calculation of SFT in the future.The main research work of this thesis can be described as following,(1) This paper summarizes the current research status and problems in SFT which have existed at home and abroad in the past two decades. It also concludes some key scientific problems about the safety and reliability of SFT. And finally, it puts forward the main studied contents.(2) Based on the characteristics of loads acted on the SFT, this paper analyzes and classifies the different loads of SFT. As the load of flow is the most active and important environmental loads for SFT, study especially focuses on the flow and simplifies it to static load. (3) This paper analyzes how to select key model parameters of FEM which is used in analyzing the stress of SFT pipe segment. And it also gives the theoretical basis while modeling.(4) With the established model, this paper performs elaborate calculation and analysis for SFT mechanical properties in different working conditions. And it determines the measuring areas of SFT health monitoring. Then it performed simulating design for the SFT monitoring scheme.At last, the studies of this paper are summarized and prospects are put forward for the future target and task.更多还原