摘要
以惠州25-3/1双层海底管道为例,提出高温荷载下刚性连接双层海底管道的侧向屈曲分析方法,并研究该类管道的侧向屈曲特性。将解析分析与有限元技术相结合,在提出刚性连接双层海底管道屈曲分析方法的同时,发展了Hobbs公式的应用范围,使其成为屈曲分析有限元建模指导工具。以分析不稳定平衡问题的改进Riks方法被证明为高温海底管道屈曲分析的有效算法,得到的弧长—载荷比例因子曲线能够充分地描述双层管道的屈曲失稳过程。惠州管道的分析结果表明,刚性连接双层海底管道的整体热稳定性较高,在海床上一般不容易发生侧向屈曲,但热荷载作用下内管的后屈曲将有可能引发较高的应力集中,对此需要充分校核;另外环空间隙的减小有利于提高内管的临界屈曲载荷,从而提升管道的整体性能。
Based on FE technology and Hobbs classical formulae, this paper develops a new approach of lateral buckling analysis of non-compliant PIP systems. By evaluating HZ25-3/1 PIP systems, Riks algorithm has been proved to be a valid technology for pipeline buckling analysis and the Arc Length vs. Load Proportionality Factor curve can entirely describe the buckling process of the PIP systems. In this method, the Hobbs formulae are used for selecting the initial buckle modes, pest-buckling process shall be analyzed by Riks algorithm. The analysis results indicate that non-compliant PIP systems have a high thermal stability on the seabed but the buckle of carrier pipe in the annular space may induce high stresses after being heated.
出处
《海洋工程》
CSCD
北大核心
2008年第3期65-69,共5页
The Ocean Engineering
