地下爆炸冲击波引起的基底滑移隔震建筑的动力响应
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摘要
对埋置在土体中的圆形衬砌内发生意外爆炸引起的附近地表的滑移隔震建筑 (考虑了土 结构相互作用 )的动力响应进行了研究。在土 结构相互作用分析中 ,分别采用有限元、无穷元和集中质点体系建立了衬砌周围的有限土区、四周的无限土区以及基底滑移隔震建筑的计算模型 ;在基底滑移隔震分析中 ,提出了用连续摩擦力模型取代传统的库仑摩擦力模型 ,避免跟踪啮合滑移的过渡边界并可减小计算误差。通过数值模拟 6层基底滑移隔震建筑在遭受地下爆炸冲击波作用且考虑土 结构相互作用所产生的动力响应 ,分析了基底滑移隔震效果以及不同隔震参数对隔震效果的影响 ,为相关的理论研究和工程实践提供了依据
In this paper, the dynamic responses, caused by the accidental explosion inside the circular liners buried in soil, of sliding base isolated buildings located on the surface of ground, are investigated by considering the interaction between soil and structures. In the analysis for the interaction between soil and structures, the calculated models for the finite soil, the semi infinite soil and the sliding base isolated building are established using a method considering with the finite element, the infinite element and the lumped mass system. In the analysis for sliding base isolation, instead of the traditional Coulomb friction model the continuous friction model is proposed in order to avoid to trace the transient boundary between meshing and sliding and to reduce the calculated error. Finally, the dynamic responses of a 6 story building with sliding base isolation, excited by the shock wave of underground explosion, is numerically simulated to investigate the effect of sliding base isolation and the influence of different isolation parameters on the effect, which provides a helpful reference for either related academic research or practices in engineering.
In this paper, the dynamic responses, caused by the accidental explosion inside the circular liners buried in soil, of sliding base isolated buildings located on the surface of ground, are investigated by considering the interaction between soil and structures. In the analysis for the interaction between soil and structures, the calculated models for the finite soil, the semi infinite soil and the sliding base isolated building are established using a method considering with the finite element, the infinite element and the lumped mass system. In the analysis for sliding base isolation, instead of the traditional Coulomb friction model the continuous friction model is proposed in order to avoid to trace the transient boundary between meshing and sliding and to reduce the calculated error. Finally, the dynamic responses of a 6 story building with sliding base isolation, excited by the shock wave of underground explosion, is numerically simulated to investigate the effect of sliding base isolation and the influence of different isolation parameters on the effect, which provides a helpful reference for either related academic research or practices in engineering.
引文
[1] 俞茂宏,马国伟,王一兵,等.砖混建筑结构基础隔震分析[J].建筑结构学报,1996,17(4):52-59.YUMao hong,MAGuo wei,WANGYi bing,etal.Analysisofbaseisolationofbrickmasonrybuildingstructure[J].JournalofBuildingStructures,1996,17(4):52-59.
[2] 樊剑,唐家祥.带限位装置的摩擦隔震结构动力特性及地震反应分析[J].建筑结构学报,2001,22(1):20-25.FANJian,TANGJia xiang.Dynamiccharacteristicsandearthquakeresponseanalysisofstructuressupportedonslidelimitedfrictionbaseisolationsystem[J \〗.JournalofBuildingStructures,2001,22(1):20-25.
[3] MostaghelN ,DavisT .Representationsofcoulombfrictionfordynamicanalysis[J].EarthquakeEngineeringandStruc turalDynamics,1997,26(5):541-548.
[4] BakerWE ,CoxPA ,WestinePS ,etal.Explosionhazardsandevaluation(fundamentalstudiesinengineering5)[M ].Amsterdam,Netherlands:ElsevierScientificPublishingCompany,1983:238-243.
[5] SmithPD ,MaysGC ,RoseTA ,etal.Smallscalemodelofcomplexgeometryforblastoverpressureassessment[J].InternationalJournalofImpactEngineering,1992,12(3):345-360.
[6] 王勖成,邵敏.有限单元法基本原理和数值方法[M ].第2版.北京:清华大学出版社,1997:117-140.
[7] 龚晓南.土塑性力学[M ].杭州:浙江大学出版社,1990:79-82.
[8] 赵崇斌,张楚汉,张光斗.用无穷元模拟半无限平面弹性地基[J].清华大学学报,1986,26(3):51-64.ZHAOChong bin,ZHANGChu han,ZHANGGuang dou.Simulationofsemi infiniteplaneelasticfoundationusinginfi niteelements[J].JournalofTsinghuaUniversity,1986,26(3):51-64.
[2] 樊剑,唐家祥.带限位装置的摩擦隔震结构动力特性及地震反应分析[J].建筑结构学报,2001,22(1):20-25.FANJian,TANGJia xiang.Dynamiccharacteristicsandearthquakeresponseanalysisofstructuressupportedonslidelimitedfrictionbaseisolationsystem[J \〗.JournalofBuildingStructures,2001,22(1):20-25.
[3] MostaghelN ,DavisT .Representationsofcoulombfrictionfordynamicanalysis[J].EarthquakeEngineeringandStruc turalDynamics,1997,26(5):541-548.
[4] BakerWE ,CoxPA ,WestinePS ,etal.Explosionhazardsandevaluation(fundamentalstudiesinengineering5)[M ].Amsterdam,Netherlands:ElsevierScientificPublishingCompany,1983:238-243.
[5] SmithPD ,MaysGC ,RoseTA ,etal.Smallscalemodelofcomplexgeometryforblastoverpressureassessment[J].InternationalJournalofImpactEngineering,1992,12(3):345-360.
[6] 王勖成,邵敏.有限单元法基本原理和数值方法[M ].第2版.北京:清华大学出版社,1997:117-140.
[7] 龚晓南.土塑性力学[M ].杭州:浙江大学出版社,1990:79-82.
[8] 赵崇斌,张楚汉,张光斗.用无穷元模拟半无限平面弹性地基[J].清华大学学报,1986,26(3):51-64.ZHAOChong bin,ZHANGChu han,ZHANGGuang dou.Simulationofsemi infiniteplaneelasticfoundationusinginfi niteelements[J].JournalofTsinghuaUniversity,1986,26(3):51-64.