基于ABAQUS的PCCP管道结构有限元分析

发布时间：2018-06-24 20:31

  本文选题：预应力钢筒混凝土管(PCCP) + ABAQUS仿真　； 参考：《南京航空航天大学》2014年硕士论文

【摘要】：随着国民经济的发展,缺水已成为制约我国各地发展的主要因素,由于我国水资源分布的不均匀性,长距离输水工程越来越多。PCCP作为一种大口径、高工压、长寿命的管道,在长距离引水工程、高压给水工程、城市给水管网改造以及电厂的补充水、循环水和水力输送系统等方面得到广泛应用,PCCP的应用大多为国家基础建设重大工程,关乎国计民生,其结构的安全性和运行的稳定性是值得重点关注的技术问题。本文结合南京水利科学研究院项目《在役超大PCCP管道结构安全评估技术研究》和南水北调中线PCCP建设项目,利用有限元软件ABAQUS,对超大口径PCCP管道的实际施工及运行阶段的安全性、稳定性进行了研究探讨。本文的主要工作如下:运用ABAQUS建立了预应力钢筒混凝土管与地基基础相互作用的有限元计算模型,对管体进行了有限元仿真分析,根据计算结果给出了管体的应力分布规律。通过在模型中施加不同的内水压力,分析管体在不同水压工况下的应力变化。得到结论:在内压0.6MPa下,PCCP各部件应力均小于其设计强度,满足PCCP的正常使用要求;在内水压从0.4MPa加载到1.4MPa过程中,预应力钢丝中应力增长均匀,钢筒中应力增长先快后慢,混凝土中拉应力增长先慢后快。加载到极限内压1.4MPa时,钢丝和钢筒中的应力小于材料的设计强度,且仍有较大富余,而在1.4MPa内水压力下管芯混凝土中最大拉应力超出其抗拉强度,拉应力最大处已开裂。运用ABAQUS模拟PCCP回填土施工过程,研究分析施工回填土过程中PCCP各部件应力分布规律及管道各部件的应力变化情况。得到结论:在回填土压作用下管道产生水平方向延伸垂直方向收缩的椭圆形变形;回填土过程中,位于管芯内侧的混凝土,管底、管顶受拉,管腰受压。位于管芯外侧的混凝土,管底、管顶受压,管腰受拉,管顶、管底位置的预应力钢丝中应力值减小,管腰位置的预应力钢丝中应力值增大,但其变化值很小。
[Abstract]:With the development of national economy, water shortage has become the main factor restricting the development of our country. Because of the uneven distribution of water resources in our country, more and more long-distance water conveyance projects are used as a large-caliber, high-pressure, long-life pipeline. The application of PCCP in long distance water diversion project, high pressure water supply project, urban water supply network reconstruction and power plant water supply, circulating water and hydraulic conveying system is widely used. Most of the application of PCCP is a major national infrastructure project, which is related to the national economy and people's livelihood. The safety of its structure and the stability of its operation are important technical problems. This paper combines the project of Nanjing Research Institute of Water Conservancy, "Research on structural Safety Assessment of Super-large PCCP Pipeline in Service" and PCCP Construction Project of Middle Route of South-to-North Water transfer Project, By using finite element software Abaqus, the safety and stability of the super-large diameter PCCP pipeline during construction and operation are studied and discussed. The main work of this paper is as follows: the finite element calculation model of interaction between prestressed steel cylinder concrete pipe and foundation is established by Abaqus, the finite element simulation analysis of pipe body is carried out, and the stress distribution law of pipe body is given according to the calculation results. By applying different internal water pressure to the model, the stress changes of the tube under different water pressure conditions are analyzed. It is concluded that the stress of each component of PCCP is less than its design strength under internal pressure of 0.6 MPA, which meets the requirements of normal use of PCCP, and the stress in prestressed steel wire increases uniformly during the loading of internal water pressure from 0.4 MPA to 1.4 MPA, and the stress growth in steel cylinder is first fast and then slow. The tensile stress in concrete grows slowly first and then quickly. When the ultimate internal pressure is 1.4 MPA, the stress in steel wire and steel cylinder is smaller than the design strength of the material, and there is still a large surplus. However, the maximum tensile stress in the pipe core concrete under 1.4 MPA water pressure exceeds its tensile strength, and the maximum tensile stress has been cracked. Abaqus is used to simulate the construction process of PCCP backfill soil. The stress distribution law of PCCP components and the stress variation of pipeline components during the construction backfill process are studied and analyzed. The conclusions are as follows: under the action of backfill earth pressure the pipe produces elliptical deformation of horizontal extension and vertical contraction and in the process of backfill concrete located in the inner side of the pipe core the bottom of the pipe the top of the pipe is pulled and the pipe waist is compressed. On the outside of the pipe core, the stress value in the prestressed steel wire at the outer side of the pipe core, the pressure on the bottom of the pipe, the tension on the waist of the pipe, the position of the top of the pipe and the bottom of the pipe decreases, but the stress value in the prestressed steel wire at the position of the pipe waist increases, but the change value is very small.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.36;TV672.2
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本文编号：2062826