桁架式跨越管道的抗震性能分析
发布时间：2018-10-10 17:58
【摘要】：随着我国油气输送管道的建设,管线不可避免的要跨越各类河流、湖泊,跨越的结构种类非常多,其中桁架管道跨越式管线因其施工简单等诸多优点,更是得到广泛应用。由于大部分管道工程处于地震频发地区,因此,十分有必要研究地震作用下桁架管道跨越工程的动力特性。首先,本文应用ANSYS有限元分析软件,按照管道的跨越长度、跨越形式、桁架截面高度、桁架截面形式等分别建立了管道、桁架的有限元模型,研究了其固有频率、固有振型和在地震波瞬态分析下的受力性能,通过分析其应力、应变、位移等研究其抗震性能。结果表明:直管管道跨越抗震性能最优,其次为90度管道跨越、45度管道跨越;增加桁架结构的高度可以提高抗震性能;三角形截面的桁架抗震性能最优。其次,由于在涉及实际工程时,将充液管道等效为集中载荷作用在桁架节点上,忽略了管道与桁架的共同作用。因此本文建立了桁架管道跨越整体模型,研究其固有频率和固有振型以及在地震波瞬态分析下的受力性能,通过抗震性能的分析表明:当管道与桁架共同参与工作时,桁架的最大应力、最大应变全部变大,最大位移普遍增加。因此,在桁架设计时,忽略管道与桁架共同作用,存在一定的安全隐患,不利于结构的抗震性能。
[Abstract]:With the construction of oil and gas pipeline in our country, the pipeline will inevitably cross all kinds of rivers, lakes and structures. Among them, truss pipeline leapfrog pipeline is widely used because of its simple construction and many other advantages. As most pipeline projects are located in earthquake-prone areas, it is necessary to study the dynamic characteristics of truss pipeline crossing projects under earthquake. First of all, the finite element model of pipeline and truss is established according to the span length, span form, truss section height, truss section form and so on, and the natural frequency of pipeline and truss is studied by using ANSYS finite element analysis software. The seismic behavior of the natural mode and its stress, strain and displacement are studied by analyzing its stress, strain and displacement under the transient analysis of seismic wave. The results show that the seismic behavior of straight pipeline is the best, the second is 90 degree pipeline span and 45 degree pipeline span, the seismic performance can be improved by increasing the height of truss structure, and the seismic performance of triangular section truss is optimal. Secondly, because the liquid-filled pipeline is equivalent to the concentrated load acting on the truss joint, the interaction between the pipeline and the truss is neglected. Therefore, this paper establishes the integral model of truss pipeline span, studies its natural frequency and natural mode and its mechanical behavior under the transient analysis of seismic wave. The analysis of seismic behavior shows that: when the pipeline and truss work together, The maximum stress and strain of the truss are all increased, and the maximum displacement is generally increased. Therefore, in the design of truss, ignoring the interaction of pipeline and truss, there are some hidden dangers of safety, which is not conducive to the seismic performance of the structure.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973
，
本文编号：2262742
[Abstract]:With the construction of oil and gas pipeline in our country, the pipeline will inevitably cross all kinds of rivers, lakes and structures. Among them, truss pipeline leapfrog pipeline is widely used because of its simple construction and many other advantages. As most pipeline projects are located in earthquake-prone areas, it is necessary to study the dynamic characteristics of truss pipeline crossing projects under earthquake. First of all, the finite element model of pipeline and truss is established according to the span length, span form, truss section height, truss section form and so on, and the natural frequency of pipeline and truss is studied by using ANSYS finite element analysis software. The seismic behavior of the natural mode and its stress, strain and displacement are studied by analyzing its stress, strain and displacement under the transient analysis of seismic wave. The results show that the seismic behavior of straight pipeline is the best, the second is 90 degree pipeline span and 45 degree pipeline span, the seismic performance can be improved by increasing the height of truss structure, and the seismic performance of triangular section truss is optimal. Secondly, because the liquid-filled pipeline is equivalent to the concentrated load acting on the truss joint, the interaction between the pipeline and the truss is neglected. Therefore, this paper establishes the integral model of truss pipeline span, studies its natural frequency and natural mode and its mechanical behavior under the transient analysis of seismic wave. The analysis of seismic behavior shows that: when the pipeline and truss work together, The maximum stress and strain of the truss are all increased, and the maximum displacement is generally increased. Therefore, in the design of truss, ignoring the interaction of pipeline and truss, there are some hidden dangers of safety, which is not conducive to the seismic performance of the structure.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE973
，
本文编号：2262742
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