混凝土的动力特性与拱坝的非线性地震响应
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摘要
总结分析了混凝土材料的动力特性及其在大坝抗震设计中应用的发展现状及其存在的问题。应用一致黏塑性模型研究了混凝土的应变速率相关特性对结构动力响应的影响。发现动荷载作用过程应变速率变化对结构的变形、应力大小与应力分布均发生影响。最后 ,研究了地震作用下高拱坝应变率沿坝体的分布 ,计算了考虑应变速率相关特性后高拱坝地震应力的分布及其开裂情况
The state of the art of experimental research on dynamic behavior of concrete and its application to aseismic design of dams are briefly reviewed and critically assessed.By employing the viscoplastic consistency model,the strain rate effect of concrete on dyanamic response of structures is studied.It was found that the magnitude and distribution of displacement and stress of the structures are affected greatly.As an example,the strain rate distribution of a high arch dam subjected to earthquke excitation is calculated and the nonlinear stress response and crack development of the dam are also calculated and examined.It is concluded that the strain rate effect has important significance in aseismic safety evaluation of high concrete dams.
The state of the art of experimental research on dynamic behavior of concrete and its application to aseismic design of dams are briefly reviewed and critically assessed.By employing the viscoplastic consistency model,the strain rate effect of concrete on dyanamic response of structures is studied.It was found that the magnitude and distribution of displacement and stress of the structures are affected greatly.As an example,the strain rate distribution of a high arch dam subjected to earthquke excitation is calculated and the nonlinear stress response and crack development of the dam are also calculated and examined.It is concluded that the strain rate effect has important significance in aseismic safety evaluation of high concrete dams.
引文
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[8] 肖诗云,林皋,逮静洲,王哲.应变率对混凝土抗拉特性的影响[J].大连理工大学学报,2001,41:721-725.
[9] 逮静洲,林皋,肖诗云,王哲.混凝土材料经历三向受压荷载历史后抗拉强度劣化研究[J].水利学报,2001,():68-75.
[10] 林皋,王哲.可以考虑应力球量历史影响的混凝土强度准则[J].土木工程学报2002,35(5):1-6
[11] 肖诗云,林皋,王哲.WillianWarnke三参数率相关动态本构模型[J].(待刊出)
[12] 陈健云,林皋.考虑速率型混凝土弹塑性损伤模型的高拱坝地震响应分析[J].土木工程学报(待刊出)
[13] ValliappanS ,YazdchiM ,KhaliliN .Seismicanalysisofarchdams acontinuumdamagemechanicsapproach[J].InternationalJournalforNumericalMethodsinEngineering,1999,45:1695-1724.
[2] RaphaelJM .TensileStrengthofConcrete[J].ACIJournal,1984,81:158-165.
[3] KollgaardEB .CriteriaforSeismicSafetyApproachesforEvaluationofAnalyticalResults[A],ProceedingsofChinaUSWorkshoponEarthquakeBehaviourofArchDams[C].Beijing,China,1987:329-348.
[4] JapanNationalCommitteeonLargeDams.EarthquakeResistantDesignFeaturesofDamsinJapan[R].inEarthquakeResistantDesignforCivilEngineeringStructuresinJapan,1996,1-30.
[5] HarrisDW ,MohorovicCE ,DolenTP .DynamicPropertiesofMassConcreteObtainedfromDamCores[J].ACIMaterialsJournal,2000,97:290-296
[6] BischoffPH ,PerrySH .CompressiveBehaviourofConcreteatHighStrainRates[J].MaterialsandStructures,1991,24:425-450.
[7] MalvarLJ ,RossCA .ReviewofStrainRateEffectsforConcteteinTension[J].ACIMaterialsJournal,1998,95:735-739.
[8] 肖诗云,林皋,逮静洲,王哲.应变率对混凝土抗拉特性的影响[J].大连理工大学学报,2001,41:721-725.
[9] 逮静洲,林皋,肖诗云,王哲.混凝土材料经历三向受压荷载历史后抗拉强度劣化研究[J].水利学报,2001,():68-75.
[10] 林皋,王哲.可以考虑应力球量历史影响的混凝土强度准则[J].土木工程学报2002,35(5):1-6
[11] 肖诗云,林皋,王哲.WillianWarnke三参数率相关动态本构模型[J].(待刊出)
[12] 陈健云,林皋.考虑速率型混凝土弹塑性损伤模型的高拱坝地震响应分析[J].土木工程学报(待刊出)
[13] ValliappanS ,YazdchiM ,KhaliliN .Seismicanalysisofarchdams acontinuumdamagemechanicsapproach[J].InternationalJournalforNumericalMethodsinEngineering,1999,45:1695-1724.
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