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                             ResearchonimprovedMLPmodelforseismicfragilityanalysisof
                               rockfilldam byembeddingspatialfeaturesoftime - frequency

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                    WANGXiaoling,LIQingmeng,LIUZongxian,YUJia,YUHongling,WANGHaodong
                 (1.StateKeyLaboratoryofHydraulicEngineeringIntelligentConstructionandOperation,TianjinUniversity,Tianjin 300072,China;
                                 2.YalongRiverHydropowerDevelopmentCompany,Ltd,Chengdu 610051,China))
                  Abstract:Inviewofthefactthatthepresentgroundmotionindexessuchaspeakaccelerationandpeakvelocity
                  usedinseismicfragilityanalysisdonotfullyreflectthecomplexspatialfeaturesoftime - frequencyofgroundmo
                  tion,andthecurrentseismicdemandmodelbasedontheassumptionoflinearfunctioninlogarithmicspaceisdiffi
                  culttorevealthecomplexnonlinearrelationshipbetweengroundmotionindexandseismicresponse,animproved
                  multilayerperceptron(MLP)modelforseismicfragilityofearth - rockfilldamsbyembeddingspatialfeaturesoftime -
                  frequencyisproposed.Themodelmakesuseoftheadvantagethatcapsulenetwork (CapsNet)canfullycaptureand
                  characterizethespatiallocationdistributionoftargetfeatures , extractthedeepfeaturesreflectingthespatial
                  featuresoftime - frequencydistributionofgroundmotionfrom theWavelettime - frequencydiagram ofgroundmo
                  tion ,andmergethemwithtraditionalfeaturesinthewayoffeaturesplicingtoconstructthegroundmotionfusion
                  index.Furthermore,thesuperparameterssuchasthenumberofneuronsandlearningrateofMLPareoptimizedby
                  TreestructuredParzenEstimator(TPE),andtheseismicdemandmodelofearth - rockfilldambasedonTPE - MLP
                  isproposedtoreflectthecomplexnonlinearrelationshipbetweengroundmotionfusionindexandseismicresponse ,
                  soastorealizethereliableanalysisofseismicfragilityofearth - rockfilldam.Thecasestudyshowsthat,compared
                  withthetraditionalgroundmotionindex ,theMAEoftheearth - rockfilldam seismicdemandmodelbasedonthe
                  groundmotionspatialfeaturesoftime - frequencyfusionindexisreducedby40.5%,indicatingthereliabilityand
                  superiorityoftheproposedmodel.
                  Keywords:earth - rockfilldam;seismicfragility;spatialfeaturesoftime - frequencyofgroundmotion;seismic
                  demandmodel ;CapsNet;MLP;wavelettransform


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