Page 167 - 《水资源与水工程学报》2023年第2期
P. 167
!34 " ! 2 # & ' ( ) & * + , - Vol.34No.2
2023 $ 4 % JournalofWaterResources&WaterEngineering Apr.,2023
DOI:10.11705/j.issn.1672-643X.2023.02.21
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GHIJK:TV315 LMNOP:A LQRK:1672643X(2023)02016308
Inversionanalysisofmesomechanicalparametersofhydraulic
concretebasedonmeasuredcreepchange
2
1
1
1
1
HEYiyang,HUANGYaoying,XIETong,LIZepeng,DINGShengyong
(1.CollegeofHydraulic&EnvironmentalEngineering,ChinaThreeGorgesUniversity,Yichang443002,China;
2.ThreeGorgesNewEnergyYangjiangPowerGenerationCo.,Ltd.,Yangjiang529599,China)
Abstract:Theexistinginversionanalysisofthemesoscopicmechanicalparametersofconcreteisgeneral
lybasedonthemeasuredaxialstrain ;however,concretespecimensusuallyshowobviousPoissoneffect
underloads.So ,themechanicalparametersoptimizedbythecombinationofmeasuredlongitudinaland
transversestraininversioncanbetterreflecttherealperformanceofthematerial.Here ,theuniaxialcom
pressioncreepPoisson ’sratiotestofhydraulicconcretewithdifferentloadingageswasconducted,and
thentheelasticparametersofaggregateandmortarwereinvertedusingthecombinedmethodof “orthogo
naldesign-neuralnetwork-mesoscopicfiniteelementmodel ”,basedonthemeasuredlongitudinaland
transversestrainsoftheloadingandloadholdingstages.Then,themeasuredcreepvariabilityofconcrete
wastakenastheinitialvalueofthemortar ,andthecreepvariabilityandthecreepPoisson’sratioofthe
mortarattheloadholdingstagewereobtainedbyinversion.Finally,thecreepvariabilityofmortarand
thecreepvariabilityofconcreteobtainedbyinversionwerecomparedandanalyzed.Theresultsshowthat
thereisadifferencebetweenthemechanicalparametersofaggregate&mortarandconcrete,theelastic
Poisson’sratioofaggregateandmortarobtainedfrom measuredstraininversionisbetween0.13and
0.20 ,andthecreepPoisson’sratioofmortarisabout0.125;underthesameloadingage,thecreep
characteristicsofmortararesimilartothatofconcreteandthecreepvariabilityofmortarislargerthan
thatofconcrete,whichisabout2.5timesgreateraccordingtothisresearch.
Keywords:hydraulicconcrete;mesomechanicalparameter;parameterinversion;creepvariability;
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