爆炸荷载作用下轻型木框架墙的动力行为分析

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中图分类号：0383 国标学科代码：13035 文献标志码：A

Abstract：Compared toconcreteandsteel structures，researchonthe blastresistanceof timber structures isrelativelyscarce. Althoughexperimental studiesontheblastperformanceof light-frame wood walls havebeenconducted，relevant numerical studiesremain limited.This studyaddresses the numerical modelingoflight-frame wood walsunder blast loads，witha focus onthe determinationof thedynamic increase factor（DIF）fornailconnectionsandthefailurecriteria for wood studs.Basedon thepartialcompositeactiontheoryananalytical expresionwas derivedtodescribetherelationshipbetwe theDFfornail conections andother mechanical propertiesof light-frame wood walls，including thestifnessof studs，the stifessof sheathing panels，and the stiffessof nail connections.Areasonablevalue for the DIFof nail connections was provided by introducing experimentally measured DIFs for wood studsand wood-frame wals.On this basis，a finite element （FE）model forblastresistance analysis oflight-frame wood wals was developed.Inthis model，the woodstuds，sheathing panels，andnail conections wererepresentedusingbeamelements，shellelements，anddiscretebeamelements，respectively.Theorthotropic characteristicsof wood-basedstructuralpanels，thenonlineardynamicbehaviorofnailconnections，andthedynamicelasticplastic features of wood studs were also appropriately modeled. Verificationof the developed model against experimental data indicates thatitcanaccurately predict the dynamicresponseoflight-frame wood wallsunderblastloads，aswellas the time andcorresponding peak displacement when wood studs fracture.FEanalysesalso show that if the variationofthestuds material properties isreasonably accounted for， thepredictions of thedynamicresponse and failure mode after thefracture of studsare in goodagreement with theexperimentalresults.Thedeveloped model paves theway forasssing theblast vulnerabilityof light-framewood structuresin future research.

Keywords：blastloads;timberstructures;ight-framewoodwals;FEmodeling;nailconections;dnamicicreasingfactor

轻型木框架结构因其成本低、建造方便、材料利用率高等优点，已成为北美最主要的住宅结构形式[1]。（剩余19299字）