深水管中管结构动态边界条件非线性时域分析

随着海洋油气开发工程作业水深的增加，管中管结构承受的波浪、海流深海环境载荷增大，可能会引发强度破坏以及疲劳损伤，造成重大损失，所以开展深水条件下管中管系统的力学行为分析研究是有必要的。本文考虑了顶部张紧力和动态边界，利用有限元模型来模拟管中管结构及其力学行为。并利用接触单元模拟内外管接触的约束条件。综合统计了管柱的接触碰撞位置和应力危险位置，提出了新型扶正器的布置方案，以达到减缓碰撞保护管柱的目的，并对比了等距离设置扶正器的方案。通过对比研究发现本文提出的扶正方案有效减缓了内外管的应力等级，对于实际工程和研究具有一定指导价值。

Deep Water Pipe-in-pipe Structural Response Analysis with Dynamic Boundary Conditions in Time Domain

In the field of offshore oil and gas industry, as the water depth increases, the environmental wave and ocean current loads borne by pipe structures increase, which may cause strength and fatigue damages. It is necessary to carry out the mechanical behavior analysis of the pipe systems. Top tension force and dynamic boundary conditions are considered, mechanical behaviors of the pipe-in-pipe structure are simulated by finite element model. The contact elements are used to simulate the constraint conditions of the inner and outer pipes contact. Both contact and high-stress positions of the pipes system are synopsized. A novel layout of centralizers is employed to reduce the collision and protect pipes, and the scheme of equidistant layout is compared. Through the comparative study, the scheme proposed in this paper is found to be effective in reducing stress level of the pipes, which provides guiding value for practical engineering and research.