市政埋地管道荷载作用下受力特性及减荷分析
发布时间：2018-10-07 19:49
【摘要】：随着自然灾害逐年频发,作为重要生命线方式的埋地管道安全性逐渐凸显出来,管道作为运输能量最为经济可靠的方法,其在城市建设中的重要性尤为重要。管道埋设在土体中,受到周围土体介质的约束,受力特性很大程度上受到限制。但是管线作为长度较长的线状结构,穿越条件复杂,因此对城市埋地管道应力和应变以及破坏减轻的研究分析势在必行。铸铁管道受力特性比较典型,国内外研究人员已经进行了大量埋地管道纵向和横向力学性质的研究,本文在前人研究基础上,使用有限元分析软件ANSYS建立铸铁管道不同管径的非线性土体摩擦模型,旨在建立更加合理的管道模拟形式,得到更加可靠的结果,分析管道不同荷载下变形特性和可靠性。具体来讲,本文进行的主要研究工作包括：(1)在不考虑地基不均匀沉降的情况下,给出管道分析模型关键参数,建立纵向管土相互耦合模型,进行管道内力分析,并计算管道的横向、纵向、环向应力。(2)进行管道受力变形和可靠性分析,提出管道受力情况下变形特征,以及失效判断步骤,判断管道结构危险点,以及管道结构可靠指标和失效概率。(3)使用有限元分析软件ANSYS建立管土接触非线性有限元模型,定量分析不同管道参数下,管道应力、应变、以及位移变化,并分析参数对管道的影响大小,分析不同工况下,管道应力的分布特征,判断其失效状态。(4)在计算和模拟基础上,得到埋地管道应力分布特性,并根据工程实际,提出合理的优化设计和减荷措施,并分析其可行性。
[Abstract]:With the frequent occurrence of natural disasters year by year, the safety of buried pipeline, which is an important lifeline, is becoming more and more important. As the most economical and reliable method of transportation energy, pipeline plays an important role in urban construction. Pipe buried in the soil is constrained by the surrounding soil media, and the mechanical characteristics are limited to a great extent. However, as a long linear structure, the crossing condition of pipeline is complex, so it is imperative to study and analyze the stress, strain and damage mitigation of buried pipeline. The mechanical properties of cast iron pipeline are typical. Researchers at home and abroad have done a lot of research on longitudinal and transverse mechanical properties of buried pipeline. The nonlinear soil friction model of cast iron pipe with different diameter is established by using finite element analysis software ANSYS. The purpose of this paper is to establish a more reasonable pipe simulation form, obtain more reliable results, and analyze the deformation characteristics and reliability of the pipeline under different loads. Specifically, the main research work in this paper includes: (1) without considering the uneven settlement of the foundation, the key parameters of the pipeline analysis model are given, the longitudinal pipe-soil coupling model is established, and the internal force of the pipeline is analyzed. At the same time, the transverse, longitudinal and circumferential stresses of the pipeline are calculated. (2) the deformation and reliability analysis of the pipeline are carried out, and the deformation characteristics under the stress of the pipeline, as well as the failure judgment steps, are put forward to judge the dangerous point of the pipeline structure. And the reliability index and failure probability of pipeline structure. (3) the nonlinear finite element model of pipe and soil contact is established by using finite element analysis software ANSYS to quantitatively analyze the variation of stress, strain and displacement of pipeline under different pipeline parameters. The influence of parameters on pipeline is analyzed, the distribution characteristics of pipeline stress under different working conditions are analyzed, and the failure state is judged. (4) on the basis of calculation and simulation, the stress distribution characteristics of buried pipeline are obtained, and according to the engineering practice, the stress distribution characteristics of buried pipeline are obtained. Reasonable optimization design and load reduction measures are put forward, and its feasibility is analyzed.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU990.3;TU312.1
[Abstract]:With the frequent occurrence of natural disasters year by year, the safety of buried pipeline, which is an important lifeline, is becoming more and more important. As the most economical and reliable method of transportation energy, pipeline plays an important role in urban construction. Pipe buried in the soil is constrained by the surrounding soil media, and the mechanical characteristics are limited to a great extent. However, as a long linear structure, the crossing condition of pipeline is complex, so it is imperative to study and analyze the stress, strain and damage mitigation of buried pipeline. The mechanical properties of cast iron pipeline are typical. Researchers at home and abroad have done a lot of research on longitudinal and transverse mechanical properties of buried pipeline. The nonlinear soil friction model of cast iron pipe with different diameter is established by using finite element analysis software ANSYS. The purpose of this paper is to establish a more reasonable pipe simulation form, obtain more reliable results, and analyze the deformation characteristics and reliability of the pipeline under different loads. Specifically, the main research work in this paper includes: (1) without considering the uneven settlement of the foundation, the key parameters of the pipeline analysis model are given, the longitudinal pipe-soil coupling model is established, and the internal force of the pipeline is analyzed. At the same time, the transverse, longitudinal and circumferential stresses of the pipeline are calculated. (2) the deformation and reliability analysis of the pipeline are carried out, and the deformation characteristics under the stress of the pipeline, as well as the failure judgment steps, are put forward to judge the dangerous point of the pipeline structure. And the reliability index and failure probability of pipeline structure. (3) the nonlinear finite element model of pipe and soil contact is established by using finite element analysis software ANSYS to quantitatively analyze the variation of stress, strain and displacement of pipeline under different pipeline parameters. The influence of parameters on pipeline is analyzed, the distribution characteristics of pipeline stress under different working conditions are analyzed, and the failure state is judged. (4) on the basis of calculation and simulation, the stress distribution characteristics of buried pipeline are obtained, and according to the engineering practice, the stress distribution characteristics of buried pipeline are obtained. Reasonable optimization design and load reduction measures are put forward, and its feasibility is analyzed.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU990.3;TU312.1
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