Research status and progress of local buckling of directly buried high temperature hot water pipelines
This paper first introduces the current research status of local buckling of buried pipelines from three perspectives:theoretical research,experimental research and finite element analysis.Then,based on the theoretical review of local buckling of pipelines,the test of initial geometric defects of pipelines and finite element analysis,it focuses on the recent research progress of local buckling of directly buried high-temperature hot water pipelines.Finally,taking DN1400 pipeline as an example,elastoplastic finite element analysis of the working pipe wall thickness and Q235B material obtained by the local stability checking formula of CJJ/T 81-2013 is carried out under the design condition.The result shows that the pipeline enters the yield stage locally,but no structural instability occurs.According to the material fatigue curve,the pipeline can meet the safe operation conditions in the design life cycle.In the next research,the selection of pipe wall thickness should be further optimized on the basis of finite element analysis and full-scale test research for pipes of different materials on the basis of the above research,so as to improve the economy of the heating pipe network project.
directly buried hot water pipelinepipe local bucklinglow cycle fatigueelastoplastic finite element analysispipeline safety assessment
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