结构地震反应Pushover位移形状向量的选取
|
摘要
对结构静力弹塑性分析方法的物理意义进行了探讨,指出了该方法存在的一些局限,提出由结构前三阶振型的线性加权组合确定结构位移形状向量或将前三阶振型分别确定为前三个位移形状向量,并在把MDOF体系转换为等效SDOF体系和进行等效SDOF体系的动力时程分析时,将结构区分为屈服前和屈服后两种不同的状态.数值结果表明:采用改进的方法以后,目标位移计算精度明显提高,对结构的损伤评估结果与试验观测结果吻合.
Some limitations of the structural static Pushover analysis method were pointed out after investigations of its physical significance. Weighted linear combination of the first, second and third modes was proposed to compute displacement shape vector, or the first three modes were selected as the first three displacement shape vectors. Moreover, the structure was considered as two different structures when transforming MDOF system into equivalent SDOF system and processing SDOF system′s time history analysis before and after it was yielded. Numerical examples demonstrated that the accuracy of the target displacement improved significantly, and the calculated structural damages agreed well with those from experiments when our proposed methods were adopted.
Some limitations of the structural static Pushover analysis method were pointed out after investigations of its physical significance. Weighted linear combination of the first, second and third modes was proposed to compute displacement shape vector, or the first three modes were selected as the first three displacement shape vectors. Moreover, the structure was considered as two different structures when transforming MDOF system into equivalent SDOF system and processing SDOF system′s time history analysis before and after it was yielded. Numerical examples demonstrated that the accuracy of the target displacement improved significantly, and the calculated structural damages agreed well with those from experiments when our proposed methods were adopted.
引文
[1] FEALLAG.EvaluationofTheR/CStructuresSeismicResponsebyMeansofNonlinearStaticPushoverAnalyses[A].11thWorldConferenceonEarthquakeEngineering[C].Acapulco,Mexico,1996,1146.
[2] KILARV,FAJFARP.SimplifiedPushoverAnalysisofBuildingStructures[A].11thWorldConferenceonEarthquakeEngineering[C].Acapulco,Mexico,1996,1011.
[3] 杨溥,李英民,王亚勇,等.结构静力弹塑性分析方法的改进[J].建筑结构学报,2000,21(1):44-51.
[4] FAJFARP.CapacitySpectrummethodBasedonInelasticDemandSpectrum[J].Earthquakeengineeringandstructuraldynamics,1999,28(4):979-993.
[5] FAJFARP,GA PER I P.TheN2MethodfortheSeismicDamageAnalysisofRCBuildings[J].EarthquakeEngineeringandStructuralDynamics,1996,25(1):31-46.
[6] KRAWINKLERH,SENEVIRATNAGDPK.ProsandConsofPushoverAnalysisofSeismicPerformanceEvaluation[J].EngineeringStructures,1998,20:452-464.
[7] TAKIZAWAH.NotesonSomeBasicProblemsinInelasticAnalysisofPlanarRCStructuresPartⅠ[J].TransactionofthearchitecturalInstituteofJapan,1976,240:51-62.
[8] TAKIZAWAH.NotesonSomeBasicProblemsinInelasticAnalysisofPlanarRCStructuresPartⅡ[J].TransactionofthearchitecturalInstituteofJapan,1976,241:65-77.
[2] KILARV,FAJFARP.SimplifiedPushoverAnalysisofBuildingStructures[A].11thWorldConferenceonEarthquakeEngineering[C].Acapulco,Mexico,1996,1011.
[3] 杨溥,李英民,王亚勇,等.结构静力弹塑性分析方法的改进[J].建筑结构学报,2000,21(1):44-51.
[4] FAJFARP.CapacitySpectrummethodBasedonInelasticDemandSpectrum[J].Earthquakeengineeringandstructuraldynamics,1999,28(4):979-993.
[5] FAJFARP,GA PER I P.TheN2MethodfortheSeismicDamageAnalysisofRCBuildings[J].EarthquakeEngineeringandStructuralDynamics,1996,25(1):31-46.
[6] KRAWINKLERH,SENEVIRATNAGDPK.ProsandConsofPushoverAnalysisofSeismicPerformanceEvaluation[J].EngineeringStructures,1998,20:452-464.
[7] TAKIZAWAH.NotesonSomeBasicProblemsinInelasticAnalysisofPlanarRCStructuresPartⅠ[J].TransactionofthearchitecturalInstituteofJapan,1976,240:51-62.
[8] TAKIZAWAH.NotesonSomeBasicProblemsinInelasticAnalysisofPlanarRCStructuresPartⅡ[J].TransactionofthearchitecturalInstituteofJapan,1976,241:65-77.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心