月牙肋岔管的三维参数化设计与安全评估

发布时间：2018-05-25 01:37

本文选题：月牙肋岔管 + 三维参数化设计　；参考：《广西大学》2014年硕士论文

【摘要】：水电站引水系统采用集中供水和分组供水时,管道分流需要设置分岔管,其是管道体系的重要组成部位,被认为是管道系统的“咽喉”。分岔管有多种结构型式,月牙肋岔管是其中一种,因其具有受力明确、结构合理和制作安装难度较低等优点,在国内外大中型电站,尤其是抽水蓄能电站中得到了广泛的应用。然而,月牙肋岔管由空间薄壳和内加强月牙肋构成,其传力体系复杂,结构设计繁琐,现设计方法是在多个假设基础上推导得到的,难于准确地进行结构安全评估。同时,月牙肋岔管内压通常较高,靠近厂房,一旦发生事故将造成重大生命和财产损失。鉴于此,论文在课题组以往研究工作基础上,针对月牙肋岔管,开展了三维参数化设计与安全评估研究： (1)提出了月牙肋岔管三维参数化设计的方法。通过联合应用程序化语言、设计和分析软件,实现了月牙肋岔管的三维参数化设计,可以显著提高该结构的设计效率。 (2)提出了基于应力的月牙肋岔管安全评估方法。研究确定了月牙肋岔管结构分析模型的范围和边界条件,分析了结构响应的主要影响因素和工程规律,引入热点应力和承载比,提出了有效的基于应力的月牙肋岔管安全评估方法。 (3)提出了基于内力的月牙肋岔管安全评估方法。采用由结点力求解断面内力的方法,提出肋板结构的安全评估方法,同时引入板壳结构的广义屈服准则,提出基于内力的月牙肋岔管安全评估方法。
[Abstract]:When centralized water supply and grouped water supply are adopted in the diversion system of hydropower stations, bifurcation pipes are required for pipe diversion, which is an important part of the pipeline system and is considered to be the "throat" of the pipeline system. There are many structural types of bifurcation pipe, and crescent rib bifurcation pipe is one of them. Because of its advantages such as clear force, reasonable structure and low difficulty in fabrication and installation, it has been widely used in large and medium-sized power stations at home and abroad, especially in pumped storage power stations. However, the branch tube of crescent rib is composed of space thin shell and inner strengthened crescent rib, its transmission system is complex and the structure design is complicated. The present design method is derived on the basis of many hypotheses, and it is difficult to accurately evaluate the structural safety. At the same time, the inner pressure of the crescent rib bifurcation pipe is usually high and close to the factory building, which will cause great loss of life and property in the event of an accident. In view of this, based on the previous research work of the research group, the paper carried out the three-dimensional parametric design and safety evaluation research for the crescent rib bifurcation pipe. A three-dimensional parameterized design method of crescent rib bifurcation pipe is presented. The 3D parameterized design of the crescent rib bifurcation pipe is realized by combining the programming language with the design and analysis software, and the design efficiency of the structure can be improved significantly. A stress-based method for evaluating the safety of crescent rib bifurcation pipe is proposed. The range and boundary conditions of the structural analysis model of the crescent rib bifurcation pipe are determined, the main influencing factors and engineering rules of the structural response are analyzed, and the hot spot stress and load ratio are introduced. An effective method for evaluating the safety of crescent rib bifurcation pipe based on stress is presented. A method for evaluating the safety of crescent rib bifurcation pipe based on internal force is proposed. By using the method of seeking to solve the internal force of the cross section by the node, the safety assessment method of the ribbed structure is put forward. At the same time, the generalized yield criterion of the plate and shell structure is introduced, and the method of evaluating the safety of the crescent rib bifurcation pipe based on the internal force is put forward.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV732.43

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