无缺陷管道屈服和破裂极限状态应用研究

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Abstract：Thisstudyfocusedonthelimitstateequationfordefect-freepipelines，identifyingeyparametersafectingpipelinesfety suchaspressure，pipestrength，ndaltknssAsensitivitynalysisofpipelinfureprobabilitwithespecttohepaete revealed the following ranking：mean pressure > standard deviation of pipe strength > mean pipe strength > mean wall thickness > standard deviation of pressure > standard deviation of wall thickness.Taking a natural gas pipeline （1219 mm，L555 steel grade，10 MPa） asanexample，thestudyfoundthatadoptingaO.5designfactorforwalthicknessinhigh-onsequenceareas （HCAs）acrossdierent regionalclasificationsensuredniformsafetylevelsunderdesignonditions.Howeverduringstrengthpressuretestingtheyield failureprobabilityincreasedbyovertimesomparedtodesignconditions，exceedingalowabletresholdsandposingruptursks. Tomitigatethisfilureprobabilitytosolutioswereproposd：firstusingaO.4dsignfctorforalthicknessaongtetielie， andsecond，increasingthemeanyieldstrengthfrom555MPato60OMPaandthetensilesrengthfrom625MPato688MPa，hile tightening manufacturing parameter tolerances to reduce variability.

Keywords：defect-free pipeline; yield; rupture; limit state; failure probability

近年来，随着全球能源结构向低碳化转型加速，长输管道作为油气、氢能等能源输送的核心载体，其建设和运营规模持续扩大。（剩余7958字）