海底管道临时管跨允许最大跨长的计算

Calculation of the allowable maximum span of temporarily-suspended submarine pipeline section

海底管道悬跨管段在波流联合作用下极易发生共振破坏和局部屈曲破坏,而悬跨管段跨长是其重要影响因素之一。针对海底管道临时管跨的极限强度问题,分别从管道屈曲强度、屈服强度及共振强度等方面,给出计算允许最大跨长的方法和流程,采用VBA语言开发了海底管道悬跨许用跨长计算分析软件,并进行实例计算,得到不同阶段海底管道允许最大跨长。相关方法和软件可以为现场工程人员解决临时管跨评估问题提供有效的支持,从而加快总体工程进度。

The suspended section of a submarine pipeline is vulnerable to resonant vibration and local deflection under the combined effect of wave and current. Length of span is one of the key influential factors. As to the ultimate strength of temporary pipeline span, this paper provides the approach and process to calculate the allowable maximum span in aspects of deflection strength, yield strength and resonance strength, and adopts VBA language to develop the calculating and analysis software for the allowable maximum span of suspended submarine pipeline section. Based on case study, the allowable maximum spans of submarine pipeline at different stages of service life are acquired. Relevant approach and software can provide effective support for field engineers to solve problems in assessment on temporary span, so as to accelerate the process of the whole project. （1 Figure, 3 Tables, 12 References）