摘要
Buried pipeline systems are vulnerable to joint damage in earthquakes.Previous studies have shown that bellows joints are effective in increasing deformation capacity and reducing the axial force of the main pipeline.However,the effectiveness of bellows joints in enhancing the deformation capacity of the pipelines is affected by the location of the crossing fault and the soil at the site.This paper constructs and validates a finite element model of a buried steel pipeline connected by a bellows joint using ABAQUS to investigate this issue.The effects of fault location,soil properties,and internal pressure on the bellows joint connected pipelines were analyzed using a finite element model.The results indicate that the bellows joints exhibit the best energy dissipation and deformation enhancement when the fault passes directly through the joints.Bellows joints in soft soil are better at dissipating energy,reducing pipe deformation,and mitigating pipe damage compared to those in hard soils.The internal pressure is helpful to increase the mechanical properties of the pipelines.The findings can provide some guidance for pipeline design and mitigation strategies for ensuring the reliability and safety of buried pipeline systems in earthquake-prone areas.
基金
funded by the National Natural Science Foundation of China(Grant Nos.52178295 and 52308519)
the Open Research Fund Program of Guangdong Key Laboratory of Earthquake Engineering and Application Technology(Guangzhou University)(Grant No.2020B1212060071)
the Natural Science Foundation of Tianjin(Grant No.23JCQNJC00910).
