浅海竖L型悬空管道三维动力响应分析

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (20) : 47-54.

论文

浅海竖L型悬空管道三维动力响应分析

李效民1，郝兴龙1，李朋2

作者信息 +

Three-dimensional dynamic response analysis of a vertical L-shaped suspended pipeline in shallow sea

LI Xiaomin1，HAO Xinglong1，LI Peng2

Author information +

文章历史 +

摘要

海底管道不仅会在平直段出现悬空，膨胀弯管处也会出现悬空，此时水平悬空段与垂直立管段整体呈L型并长期处于波浪海流激励下，波流作用引起的动力响应及疲劳损伤不容忽视。本文基于向量式有限元(VFIFE)法，考虑三向管土接触作用，建立了考虑往复运动时侧向土抗力位移模型，采用非线性STOKES五阶波模拟了波流联合作用下埕岛水域某竖L型海底悬空管道的动力响应，并对考虑波流联合作用以及底端管卡松动的特殊情况下的动力响应进行了分析，评价其对疲劳寿命的影响。结果表明：对于两端固定的竖L型海底悬空管道，最不利点为管卡处，其次为管土分离点、弯头处以及跨中，共四个潜在危险点，其中，跨中的应力峰值较小；考虑波流联合作用与不考虑波流联合作用差别显著；只有横向约束的管卡在管道最小疲劳寿命方面优于固定管卡；考虑侧向往复运动土体作用理论对管道整体的应力以及疲劳影响较小，但对跨中及管土分离点处的位移影响较大。

Abstract

A submarine pipeline will not only be suspended in the straight section, but also in the expansion bend. In this case, the horizontal suspension section and the vertical riser section are L-shaped and under the excitation of wave currents. The dynamic response and fatigue damage caused by wave currents cannot be ignored. Based on the vector form intrinsic finite element (VFIFE) method and considering the three-dimensional pipe-soil contact effect, the dynamic response of a vertical L-shaped submarine suspended pipeline in Chengdao waters under the combined action of wave and current was simulated by using the fifth-order non-linear STOKES wave. The resistance displacement model of lateral soil considering reciprocating motion was established. The dynamic response under the special circumstances of combined action of wave and current and the loosening of bottom pipe clamp was analyzed, and its effect on fatigue life was evaluated. The results show that for the vertical L-shaped submarine suspended pipeline with fixed ends, the most disadvantageous point is the pipe clamp, followed by the pipe-soil separation point, elbow, and mid-span. There are four potential dangerous points, of which the peak stress in mid-span is smaller. There is a significant difference between considering wave-current interaction and not considering wave-current interaction. Only the transversely restrained pipe clamp is superior to the fixed pipe clamp in the minimum fatigue life of the pipe. Considering the lateral reciprocating soil action theory, the stress and fatigue of the whole pipeline are less affected, but the displacement at the mid-span and the separation point of the pipeline and soil is more affected.

导出引用

李效民1，郝兴龙1，李朋2. 浅海竖L型悬空管道三维动力响应分析[J]. 振动与冲击, 2020, 39(20): 47-54

LI Xiaomin1，HAO Xinglong1，LI Peng2. Three-dimensional dynamic response analysis of a vertical L-shaped suspended pipeline in shallow sea[J]. Journal of Vibration and Shock, 2020, 39(20): 47-54

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