中文摘要：

以惠州A海底管道为例,提出了双层海底管道垂向屈曲分析的新方法,并研究了高温双层海底管道跨越段的垂向屈曲特性。应用改进的Riks算法计算非单调载荷与位移的响应历程,得到的管道变形和应力状态可以充分描述高温载荷下双层管道跨越段的垂向屈曲过程。双层海底管道的跨越设计既需要考虑跨越构形引发的应力应变,也需要充分校核管道跨越段的垂向稳定性。

英文摘要：

For the submarine pipeline A of Huizhou oilfield,a new method has been presented for analyzing the upheaval buckling of submarine pipe-in-pipe system and the research has been carried out on the upheaval buckling characteristics of crossing section of high temperature submarine PIP system.In this method,the modified Riks algorithm is used to calculate the non-monotonic load and displacement response histories and the resulted pipeline deformation and stress can present a full description on the upheaval buckling process of the crossing section of high temperature pipe-in-pipe system.For the crossing section design of the pipe-in-pipe systems,it is necessary to consider the stress-strain initiated by crossing configuration and check the vertical stability of the crossing section.