摘要:
为了探讨钢筋混凝土板在爆炸载荷作用下的抗爆性能,对方形钢筋混凝土板在单向支撑条件下进
行了近场爆炸加载实验,实验中采取TNT装药对钢筋混凝土板进行加载。并利用AUTODYN 软件采用流
固耦合算法,建立了混凝土和钢筋三维分离式实体模型,对钢筋混凝土板的动态响应过程进行数值模拟,且考
虑应变率对钢筋和混凝土材料的动态本构特性的影响。模拟得到的钢筋混凝土板破坏现象与实验结果吻合
较好。在此基础上,分析了不同质量的装药作用下钢筋混凝土板的损伤和破坏特征,合理展现了钢筋混凝土
板从混凝土开裂、底部层裂碎片形成、钢筋屈服到混凝土板局部震塌的动态演变过程。研究结果表明,随着装
药质量的增加,方形钢筋混凝土板的破坏模式逐渐由整体弯曲破坏转变为局部冲切破坏。
Abstract:
Toidentifytheanti-explosionperformancesofreinforcedconcrete(RC)slabs,close-inexplosionexperimentswereconductedforsquareRCslabssupportedunidirectionally,
inwhichtheRC
slabswereloadedbyTNTcharges.BasedonthecommercialhydrocodeAUTODYN,athree-dimensionalsolidmodelincludingexplosive,
airandRCslabwithconcreteandreinforcingbarsbeingseparatedwasdevelopedbyusingthegas-
solidcoupledtechniquetosimulatethedynamicresponseofthe
RCslabs.Inthenumericalsimulation,thestrainrateeffectsweretakenintoaccountonthedynamicalconstitutivebehaviorsofthesophisticatedconcreteandreinforcingbarmaterial
.Sequentially,the
correspondingdamagemechanismsandfailuremodesoftheRCslabswereanalyzedunderdifferent
TNTchargeweights.ThedynamicalevolutionprocessofRCslabswasobservedrealisticallyfrom
crackingandbreaking-upoftheconcrete,yieldingandrupturingofreinforcingbarstolocalperforation.
ThedamageoftheRCslabsbythenumericalsimulationisingoodagreementwiththeexperimentalresults.
AndwiththeincreaseoftheTNTchargeweights,thefailuremodeofRCslabsgraduallychangesfromoverallflexurefailuretolocalpunchingfailure
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