The Finite Element Analysis of the Influence of Arch Foot Displacement on Out⁃of⁃Plane Stability of Circular Arch Pipe

doi:10.3969/j.issn.1006-396X.2021.04.012

Abstract

Abstract:

Out?of?plane instability is one of the common instability forms of arc?shaped arched spanning pipelines. In this work, the ANSYS software was used to simulate the impact of wind and vertical distributed load on arc?shaped arch pipes under normal conditions. The influence of the arch foot displacement on the limit vertical distributed load is analyzed by finite element calculation. The analysis results show that the horizontal displacement of the arch foot has the greatest impact on the limiting vertical distributed load, which will rapidly decrease the displacement, the limiting vertical distributed load decreases linearly with the increase of wind load under the same horizontal arch foot displacement, and under different wind loads, the limiting arch plane displacement of the arch is concentrated within a certain range of the horizontal displacement of the arch toe, which can be used to monitor the arch tube deformation. Based on the above results, this work provides a certain reference basis for the design and safely operating of the crossing pipeline.

Key words: Arch foot displacement, Arch pipe, Wind load, Out?of?plane stability, Finite element

摘要：

平面外失稳为圆弧形拱式跨越管道常见的失稳形式之一，为了解多荷载下圆弧形拱管的稳定性，利用ANSYS软件对正常工况下的圆弧形拱管受风荷载和竖直分布荷载的工况进行模拟，对拱脚位移对极限竖直分布荷载的影响进行有限元计算分析。分析结果表明，拱脚水平位移对极限竖直分布荷载影响最大，且存在极限竖直分布荷载随拱脚水平位移增大而迅速下降；相同水平拱脚位移下，极限竖直分布荷载随风荷载的增大线性减小；不同风荷载下拱顶极限出拱平面位移在拱脚水平位移一定范围内分布集中，可结合水平拱脚位移对拱管变形情况进行监测。以上研究为跨越管道的设计和安全运行提供了一定的参考依据。

关键词: 拱脚位移, 拱管, 风荷载, 平面外稳定性, 有限元

CLC Number:

TQ547.8+1

Yulong Li, Xing Sun, Xiaoling Li, Yuguo Wu, Guofu Wang. The Finite Element Analysis of the Influence of Arch Foot Displacement on Out⁃of⁃Plane Stability of Circular Arch Pipe[J]. Journal of Petrochemical Universities, 2021, 34(4): 72-77.

李雨龙, 孙星, 李小玲, 吴玉国, 王国付. 拱脚位移对圆弧形拱管平面外稳定性影响的有限元分析[J]. 石油化工高等学校学报, 2021, 34(4): 72-77.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.3969/j.issn.1006-396X.2021.04.012

https://journal.lnpu.edu.cn/syhg/EN/Y2021/V34/I4/72

Figures/Tables 9

Fig.1 Schematic diagram of circular arch spanning pipeline

Fig.2 Schematic diagram of the direction of arch foot displacement

Fig.3 Schematic diagram of the stress analysis of micro unit in arch pipeline

Fig.4 Schematic diagram of circular arch spanning pipeline finite model and local model

Fig.5 Schematic diagram of pipeline load

Fig.6 Arch foot displacement direction?limit vertical distributed load and maximum Von Mises stress before loading curve

Fig.7 Arch foot displacement in x direction-limit vertical distribution load curve under different basic wind pressure

Fig.8 Arch foot displacement?arch top limit out of the arch plane displacement and the maximum Von Mises stress before loading curve

Fig.9 Displacement of arch foot?arch top limit out of the arch plane displacement in x direction under different basic wind pressure

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