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摘要: 在水下爆炸冲击荷载作用下,结构动力响应较之静态荷载和地震荷载作用下要复杂得多。通过大 量的数值模拟,探讨了混凝土重力坝在水下爆炸冲击荷载作用下,大坝高度、库前水位对大坝抗爆性能的影 响,为大坝抗爆性能评估和防护设计提供基础。数值计算中,构建了重力坝水下爆炸全耦合数值模型,并考虑 爆炸冲击作用下混凝土的高应变率效应。研究结果表明:对于混凝土重力坝,随着大坝高度的增加,大坝的抗 爆性能增强;库前水位对大坝的抗爆性能影响较大,通过降低库前水位可有效提高大坝的抗爆性能。Abstract: Thedynamicresponsesofstructuresunderblastloadingaremuchmorecomplicatedthan thoseunderotherloadingssuchasstaticandearthquakeloadings.Inordertofullyrealizetheblastresistancesofconcretegravitydams, agreatmanynumericalsimulationswereimplementedbyusing three-dimensionalnonlinearfiniteelementmodels.Theinfluencesofdamheightandwaterlevelbeforethedamsontheblastresistanceofthedamswereanalyzed, andatheoreticalbasiswasprovided forantiknockperformanceevaluationandprotectiondesign.Strainrateeffectsofconcretedamswere takenintoconsiderationintheestablishmentofthefully-coupledmodelforthegravitydams.Forthis kindofconcretegravitydams,numericalresultsindicatethattheblastresistanceofthelowdamsis weakerthanthatofthehighdams,thatthewaterlevelbeforethedamsplaysanimportantroleonthe antiknockperformancesofthedams,andthattheantiknockperformancesofthedamscanbeeffectivelyimprovedbyreducingthewaterlevel.
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Key words:
- mechanicsofexplosion /
- concretegravitydam /
- antiknockperformance /
- underwaterexplosion /
- failuremode /
- dynamicresponse
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