水流作用下悬空穿越河流输油管道的动力分析
首发时间:2010-01-06
摘要:当长距离输油管道穿越河流段(简称穿越管道)受到第三方破坏时,易发生裸露或悬空,管道受到水流冲击等外载荷作用,将引起管道失效;当悬空穿越管道超过允许管跨长度时,将引起管道共振.为避免穿越管道发生疲劳破坏或断裂,将穿越管道悬空部分视为圆弧形状,非悬空部分视为与两端固定墩同步沉降的直线形状的力学模型,考虑水流冲击力、浮力、管道及其附件重力、弯曲变形及弯矩的影响,对受外载荷作用的悬空管道进行强度计算,对不同水流速度作用下的悬空管道进行振动分析.结果表明:在对穿越管道进行强度设计时,需要考虑水流冲击力、浮力、管道及其附件重力、弯曲变形及弯矩的影响,还要考虑悬空管道的涡激振动问题,这应该引起管道设计、施工和维护者的注意.
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Dynamic Analysis of Suspended River Crossing Pipeline
Abstract:When the long-distance oil pipeline under rivers (referred to as river-crossing pipelines) are damaged by the third-party, they are prone to nudity or left vacant, and the oil pipelines under the action of water flow will cause pipeline failure; and the distance of suspended pipeline is longer than the allowed length will cause the pipeline resonance. In order to avoid pipelines fatigue or broken, suspended pipelines are considered as part of the arc shape, and non- suspended pipelines are considered as the linear shape of the mechanical model with the two ends of the fixed pier synchronous. The study will consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, do the tense calculation for suspended pipelines with external load and the vibration analysis for suspended pipelines under different water flow speeds. The results showed that: the design of river-crossing suspended pipelines not only needs to consider the impact of water flow, buoyancy, the gravity of pipelines and its annexes, bending deformation and bending moment, but also to consider the floating vortex-induced vibration of the suspended pipeline, which should cause pipeline designers, constructors and maintainers’ attention.
Keywords: river-crossing pipeline dynamic analysis flow impact mechanical model
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