多龄期钢框架的地震易损性分析
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摘要
钢材锈蚀会引起结构的抗震性能与刚度的退化,为保证结构在设计期限内完成预定功能,有必要对其抗震性能进行评估。基于ABAQUS数值模拟,结合酸性大气环境下不同锈蚀程度的钢材材性试验研究成果,建立了4个不同龄期(0年、15年、30年、45年)钢框架结构有限元模型,以PGA作为地震动强度指标,以结构最大层间位移角和结构整体损伤为地震需求指标,对模型进行了增量动力时程分析,并在增量动力时程分析结果的基础上对结构进行了多龄期钢框架结构地震易损性分析。研究成果可为钢结构的全寿命设计、既有钢结构的运营以及地震风险评估等提供理论依据。
Since steel corrosion caused the deterioration of seismic performance and stiffness of structure,it is necessary to make an assessment of seismic performance to ensure the structure is in use in the design reference period. Based on the numerical simulation of ABAQUS,combined with the experimental achievement of material performance of different corrosive steel in acidic atmosphere,4 different finite element models( 0-year,15-year,30-year and 45-year) of steel frame structures were built. The seismic vulnerability analysis of multi-age steel frame structure was conducted on the basis of the incremental dynamic analysis that the PGA and structural maximum lateral displacement angle & damage index were taken as the ground motion intensity index and seismic demand index. The result of this research provides theoretical foundation for whole-life design of steel structure,application of current steel structure and seismic risk evaluation.
Since steel corrosion caused the deterioration of seismic performance and stiffness of structure,it is necessary to make an assessment of seismic performance to ensure the structure is in use in the design reference period. Based on the numerical simulation of ABAQUS,combined with the experimental achievement of material performance of different corrosive steel in acidic atmosphere,4 different finite element models( 0-year,15-year,30-year and 45-year) of steel frame structures were built. The seismic vulnerability analysis of multi-age steel frame structure was conducted on the basis of the incremental dynamic analysis that the PGA and structural maximum lateral displacement angle & damage index were taken as the ground motion intensity index and seismic demand index. The result of this research provides theoretical foundation for whole-life design of steel structure,application of current steel structure and seismic risk evaluation.
引文
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[2]Choe D E,Uardoni P,Rosowsky D,etal.Probabilistic capacity models and seismic fragility estimates for RC columns subject to corrosion[J].Reliability Engineering System Safty,2008,93(3):383.
[3]Simon J,Bracci J M,Uardoni P.Seismic response and fragility of deteriorated reinforced concrete bridges[J].Journal of Structure Engineering,2010,136(10):1273.
[4]Berto L,Vitaliani R,Saetta A,etal.Seismic assessment of existing RC structures affected by degradation phenomena[J].Structural Safety,2009,4(31):284-297.
[5]孙国华,顾强,何若全,等.基于能量反应谱的抗弯钢框架结构能量计算[J].土木工程学报,2012,45(5):43-46.SUN Guohua,GU Qiang,HE Ruoquan,et al.Evaluation of seismic energy of steel frames based on energy spectrums[J].China Civil Engineering Journal,2012,45(5):43-46.
[6]Vamvatsikos D,Cornell C A.Incremental dynamic analysis[J].Earthquake Engineering and Structural Dynamics,2002,31(3):491-514.
[7]欧进萍,牛荻涛,王光远.多层非线性抗震钢结构的模糊动力可靠性分析与设计[J].地震工程与工程振动,1990,4(10):28-32.OU Jinping,NIU Ditao,WANG Guangyuan.Fuzzy dynamical reliability analysis and design of multi-story nonlinear seismic steel structures[J].Earthquake Engineering and Engineering Vibration,1990,4(10):28-32.(in Chinese)
[8]Park Y J,Ang H S.Mechanistic seismic damage modal for reinforced concrete[J].Journal of Structural Engineering,1985,111(4):722-739.
[9]万正东.RC框架结构基于概率损伤模型的地震易损性与风险分析[D].哈尔滨:哈尔滨工业大学,2009.WAN Zhengdong.Sesmic fragility and risk analysis of RC frame structures based on probabilistic damage models[D].Harbin:Harbin Institute of Technology,2009.(in Chinese)
[10]韩淼,那国坤.基于增量动力法的剪力墙结构地震易损性分析[J].世界地震工程,2011,27(3):110-112.HAN Miao,NA Guokun.Seismic fragility analysis of shear wall structure by using incremental dynamic method[J].World Earthquake Engineering,2011,27(3):110-112.(in Chinese)
[11]龚思礼.建筑结构设计系列手册-建筑抗震设计手册[M].2版.北京:中国建筑工业出版社,2003:45.GONG Sili.Code for seismic design of buildings(version 2)[M].2nd ed.Beijing:China Architecture and Building Press,2003.(in Chinese)
[12]王丹.钢框架结构的地震易损性及概率风险分析[D].哈尔滨:哈尔滨工业大学,2006.WANG Dan.Seismic fragility analysis and probabilistic risk analysis of steel frame structures[D].Harbin:Harbin Institute of Technology,2006.(in Chinese)
[13]李刚,程耿东.基于性能的抗震设计-理论、方法与应用[M].北京:科学出版社,2004:73-74.LI Gang,CHENG Gengdong.Performance-based seismic design-theory,method and application[M].Beijing:Science Press,2004.(in Chinese)
[14]Ellingwood BR,Kinali K.Quantifying and communicating uncertainty in seismic risk assessment[J].Structural Safety,2009,31(2):179-187.
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