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                         Damageanalysisofhydraulicconcretebasedonmodifieddissipatedenergy

                                                                               3
                                                      1
                                                                   2
                                          RENQingwen,YINYajuan,GUJiafeng
                                (1.DepartmentofEngineeringMechanics,HohaiUniversity,Nanjing 211100,China;
                             2.CollegeofCivilandTransportationEngineering,HohaiUniversity,Nanjing 210098,China;
                        3.CollegeofHydraulicConservationandHydropowerEngineering,HohaiUniversity,Nanjing 210098,China)

                  Abstract:Energydissipationistheessentialpropertyofconcretedeformationandfailure.Itisafeasiblewayto
                  studythefailureofquasi - brittlematerialssuchasrockmassandconcretefromtheperspectiveofenergy.However,
                  theexistingdamageanalysisresultsbasedonthedefinitionofdamagevariablebyenergyarenotconsistentwiththe
                  actualdamageevolutionprocessofconcrete.Inthisstudy ,anewrelationbetweenthedamagevariableandthedis
                  sipatedenergyisestablished ,anditisconsideredthatthedamageofconcreteisnotallcausedbythedissipated
                  energy ,butbyapartofit.Therefore,thedissipativeenergyisdividedintotwoparts,oneisthedissipativeener
                  gyU thatcausestheconcretedamage,andtheotherisotherdissipativeenergyU intheprocessofconcretework
                     d 1
                                                                               d 2
                  andenergyconversionunderloads.Byintroducingthedamageenergydissipationcorrectioncoefficient λ ,thedam
                  agevariableisdefined.The λvalueisdeterminedaccordingtothemeasuredtestcurve,andthedamageevolution
                  equationisestablished.Thedamageanalysisresultsofthemeasuredtestcurveshowthatthedamageevolution
                  processcalculatedbythismethodismoreconsistentwiththetestcurvethanbythetraditionalmethod.Themethod
                  isappliedtothestress - straincurvegiveninthehydraulicconcretespecification ,andthevariationlawofdamage
                  variableandequivalentplasticstraininthedamageevolutionprocessofhydraulicconcretearerevealed ,whichpro
                  videsafeasiblewaytocarryoutdamageanalysisofhydraulicconcrete.
                  Keywords:damagevariable;dissipatedenergy;damageenergydissipationcorrectioncoefficient;hydrauliccon
                  crete ;damageanalysis

                                                                                    (责任编辑:韩 昆)

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