安装铺设的点荷载对大口径海底管道局部屈曲影响

海洋石油工程股份有限公司

海底管道;大口径;局部屈曲;点荷载;有限元分析

Impact of point load arising from installation and laying on local buckling of large diameter submarine pipeline
HUANG Yu, YANG Hu, LI Xu, LI Xiufeng

Offshore Oil Engineering Co. Ltd.

submarine pipeline, large diameter, local buckling, point load, finite element analysis

备注

大口径海底管道在安装过程中受到点荷载作用,比常规口径管道更易发生局部屈曲失稳。DNVGL-ST-F101-2017 规范虽然给出了海底管道局部屈曲校核中对于点荷载的修正方法,但未考虑混凝土配重层对管道的保护作用,不符合真实的大口径管道结构形式,而且计算结果偏于保守。应用有限元分析方法,对大口径海底管道安装过程中点荷载引起的局部屈曲进行系统研究,分析过程考虑了工程中真实的管道结构形式,并结合工程算例将有限元方法的计算结果与依据DNV 规范的计算结果进行对比,从分析方法上实现了对DNV 规范的补充,对于大口径海底管道的局部屈曲设计具有较好的推广价值。(图3表1,参[16]

The large diameter pipelines, compared to conventional diameter pipelines, are more likely to cause local buckling instability in case of point load subjected during its installation of submarine pipelines. In the local buckling check on submarine pipelines, the correction method, though, has been given in DNVGL-ST-F101-2017 for point load, the protection of concrete counterweight layer on the pipeline has been ignored, the method is therefore considered to be incompatible with the actual structure of large diameter pipelines, and the calculation results are conservative. With finite element analysis method, the local buckling, which is resulted from point load in the installation process of large diameter submarine pipelines, was systematically studied with actual engineering pipeline structure taken into consideration during analysis. Engineering examples were provided to compare the calculation results from finite element method with those from the DNV standard, allowing supplement to the DNV standard in terms of analysis method. This is of good popularization value for local buckling design of large diameter submarine pipelines. (3 Figures, 1 Table, 16 References)