Damage Detection of Picea asperata Sawn Timber Beams Using Modal Flexibility Curvature-中国期刊网

摘要 Thelocaldamagessuchasknots,decay,andcrackscanbetranslatedintoareductionofservicelifeduetomechanicalandenvironmentalloadings.Inwoodconstruction,itisveryimportanttoevaluatetheweakestlocationanddetectdamageattheearliestpossiblestagetoavoidthefuturecatastrophicfailure.Inthisstudy,themodaltestingwasoperatedonwoodbeamstogeneratethefirsttwomodeshapes.Anovelstatisticalalgorithmwasproposedtoextractthedamageindicatorbycomputingthemodalflexibilitycurvaturebeforeandafterdamageintimbers.Thedifferentdamageseverities,damagelocations,anddamagecountsweresimulatedbyremovingmassfromintactbeamstoverifythealgorithm.Theresultsshowedthattheproposedstatisticalalgorithmwaseffectiveandsuitabletothedesigneddamagescenarios.Itwasreliabletodetectandlocatelocaldamagesunderdifferentseverities,locations,andcounts.Thepeakvaluesofthedamageindicatorscomputedfromthefirsttwomodeshapesweresensitivetodifferentdamageseveritiesandlocations.Theywerealsoreliabletodetectthemultipledamages.

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Damage Detection of Picea asperata Sawn Timber Beams Using Modal Flexibility Curvature

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Damage Detection of Picea asperata Sawn Timber Beams Using Modal Flexibility Curvature

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