埋设悬跨海底管道的屈曲分析

考虑海床刚度,研究了埋设悬跨海底管道在热膨胀引起的轴向压力下的屈曲问题。传统方法是将悬跨管道简化为两端简支或者两端固支梁来处理。基于欧拉-伯努利梁理论,考虑线弹性海床刚度和轴向压力,建立并求解了埋设段管道和悬跨段管道在自重作用下的四阶常微分方程,获得了两段管道的静挠度和内力的解析公式。通过对静挠度的特性分析,给出了埋设管道段和悬跨管道段的稳定性判断准则。

BUCKLING ANALYSIS OF BURIED SPANNING SUBMARINE PIPELINE

This paper presents a buckling analysis of buried spanning submarine pipelines under axial compressive force caused by thermal expansion, in which the seabed stiffness is taken into account. Traditional methods treat each span segment as a simply-supported beam or clamped-clamped beam in practice. A new approach is developed based on Euler-Bernoulli beam theory, taking into account the linear elastic stiffness of seabed and temperature-driving axial force. A fourth order ordinary differential equation governing buried segment in elastic seabed and spanning segment under self-weight and axial compressive force is established and solved. The static deflection and internal force function of both segments are obtained in closed form. Stability criteria of buried segment and spanning segment are established through analyzing the characteristics of static deflection.