含点蚀缺陷输油管道修复前后的抗震性能

Seismic performance of oil pipeline with individual corrosion defect before and after repair

针对输油管道工程中常见的架空管道因存在局部腐蚀,而在地震作用下极易破坏的问题,采用ADINA有限元软件,建立含腐蚀缺陷及腐蚀缺陷修复后的输油管道与内部液体的流固耦合模型,并以管道应力最大处单元的位移、轴向应力及环向应力为指标,研究修复前后管道的抗震性能。结果表明:由于腐蚀缺陷的存在,在管道缺陷处应力集中现象非常明显,导致管道的抗震性能降低;修复后腐蚀区段管道的环向应力有所降低,挠度及轴向应力有所增加,但仍在规范允许的范围内,因此所选的工程实际中常用的B型套筒修复技术对提高腐蚀区段管道的抗震性能有效。研究结论可为今后腐蚀管道的修复提供理论指导。

Usually, existence of localized corrosion in overhead crossing pipeline may make the pipeline susceptible to damage in earthquake. The ADINA finite element software is used to establish the fluid-solid coupling model of oil pipeline with corrosion defects and internal liquids after repair of defects. Taking the displacement, axial stress and circumferential stress of the unit at the maximum pipe stress as indicators, seismic performances of the pipe before and after repair are studied. The results show that, because of the existence of corrosion defects, the stress concentration in the corroded pipe section is very obvious, which leads to the lower seismic performance of pipelines. After repair, circumferential stress at the corrosion section decreases, while deflection and axial stress increase, but still within the range allowed by the specification. Therefore, the selected B-type sleeve repair technology commonly used in engineering practice cart effectively improve the seismic performance of the pipeline in corrosion section. The research results can provide the theoretical guidance for future repair of corroded pipeline.