高层建筑的改进Modal Pushover分析方法
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摘要
目前,静力弹塑性分析方法以其实用性较强的优点受到越来越多的关注,已经被列入《建筑结构抗震设计规范》作为结构弹塑性变形验算之一。
本文首先概述了建筑结构的抗震设计思想、抗震分析、设计方法,接着介绍了静力弹塑性Pushover分析方法的国内外现状,对目前比较流行的几种Pushover方法进行了研究,指出其不足之处:这种方法很大程度上依赖于水平荷载分布模式,只考虑了对应基本振型的地震作用,忽略了高阶振型的影响。
在实际的高层建筑结构中,结构的位移向量是由多阶振型共同决定的。尤其对于长周期结构,高阶振型对结构的地震作用效应是不可忽略的。其考虑与否直接影响Pushover分析结果的准确程度。鉴于此情况,本文采用了模态Pushover分析方法(MPA),并结合能力谱法对其进行改进。在本方法中,考虑了合理振型数的选择,采用了振型分解方法的基本原理,考虑强度折减的弹塑性反应谱,使分析结果更接近结构在大震作用下的实际性能。
利用有限元分析软件SAP2000和ETABS针对二幢高层钢筋混凝土框架分别进行时程分析和Pushover分析及改进的MPA分析,算例表明由于改进的MPA方法考虑了高阶振型的影响,从而使其结果更准确。
Nonlinear static procedure (NSP) has attracted the attention of more and more researchers for its merits of practicality. It has become one of checking computations tools for nonlinear distortion.
Design procedure and analysis method of structure in earthquake are firstly introduced in this thesis. Then introduced the nonlinear static analysis of the research and development status, and introduced several kinds of static elastic-plasticity analysis method which was representative, This paper also introduced several kinds of static elastic-plasticity analysis method which was representative, and point out their disadvantages: this approach to a large extent ,dependent on the level of load distribution, but was considered the mode correspond to the role of the earthquake,ignored the high mode.
In practice, the high-rise building,the structure of the displacement vector is a multistage mode of co-decision. In particular, the long-period strcture, the hige mode of the structure of the seismic effect can not be ignored.The high model is very important to the static pushover analysis. Especially in the high-rise structure .The option of the high model will effect the result of static Pushover analysis directly. This thesis introduces and improves the modal pushover analysis method. In the method, the consideration of the appropriate selects of reasonable numbers of modes and adoption of the basic principles of the type modal decomposition method and the elastic-plastic response spectra considering strength reduce coefficient make the analysis results even near the actual performances of structures in big earthquake.
By making use of the finite element analysis program SAP2000 and ETABS, makes dynamic time history analysis ,Pushover analysis and Modal Pushover analysis on two high-rise RC building .The research results revealed that the adoption of static-plastic analysis method in this paper to conduct a Pushover analysis on structures can possesses high-accuracy calculation.
本文首先概述了建筑结构的抗震设计思想、抗震分析、设计方法,接着介绍了静力弹塑性Pushover分析方法的国内外现状,对目前比较流行的几种Pushover方法进行了研究,指出其不足之处:这种方法很大程度上依赖于水平荷载分布模式,只考虑了对应基本振型的地震作用,忽略了高阶振型的影响。
在实际的高层建筑结构中,结构的位移向量是由多阶振型共同决定的。尤其对于长周期结构,高阶振型对结构的地震作用效应是不可忽略的。其考虑与否直接影响Pushover分析结果的准确程度。鉴于此情况,本文采用了模态Pushover分析方法(MPA),并结合能力谱法对其进行改进。在本方法中,考虑了合理振型数的选择,采用了振型分解方法的基本原理,考虑强度折减的弹塑性反应谱,使分析结果更接近结构在大震作用下的实际性能。
利用有限元分析软件SAP2000和ETABS针对二幢高层钢筋混凝土框架分别进行时程分析和Pushover分析及改进的MPA分析,算例表明由于改进的MPA方法考虑了高阶振型的影响,从而使其结果更准确。
Nonlinear static procedure (NSP) has attracted the attention of more and more researchers for its merits of practicality. It has become one of checking computations tools for nonlinear distortion.
Design procedure and analysis method of structure in earthquake are firstly introduced in this thesis. Then introduced the nonlinear static analysis of the research and development status, and introduced several kinds of static elastic-plasticity analysis method which was representative, This paper also introduced several kinds of static elastic-plasticity analysis method which was representative, and point out their disadvantages: this approach to a large extent ,dependent on the level of load distribution, but was considered the mode correspond to the role of the earthquake,ignored the high mode.
In practice, the high-rise building,the structure of the displacement vector is a multistage mode of co-decision. In particular, the long-period strcture, the hige mode of the structure of the seismic effect can not be ignored.The high model is very important to the static pushover analysis. Especially in the high-rise structure .The option of the high model will effect the result of static Pushover analysis directly. This thesis introduces and improves the modal pushover analysis method. In the method, the consideration of the appropriate selects of reasonable numbers of modes and adoption of the basic principles of the type modal decomposition method and the elastic-plastic response spectra considering strength reduce coefficient make the analysis results even near the actual performances of structures in big earthquake.
By making use of the finite element analysis program SAP2000 and ETABS, makes dynamic time history analysis ,Pushover analysis and Modal Pushover analysis on two high-rise RC building .The research results revealed that the adoption of static-plastic analysis method in this paper to conduct a Pushover analysis on structures can possesses high-accuracy calculation.
引文
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[2]Peter Fajfar,Peter Gaspersic.The N2 method for the seimic damage analysis of RC buildings[J].Earthquake Engineering and Structural Dynamics,1996,25(1):31-46.
[3]Helmut Krawinkler,G.D.P.K.Senerviratna.Pros and cons of a pushover analysis of seismic performance evaluation[J].Engineering Structures,1998,20(4):452-464.
[4]Chintanapakdee C and Chopra A K,Evaluation of modal pushover analysis using generic frames,Earthquake Engng Struct.Dyn.2003,32:417-442.
[5]Jan T S,Liu M W,Kao Y C,An upper-bound pushover analysis procedure for estimating the seismic demands of high-rise buildings.Engineering Structure.2004,26
[6]叶燎原,潘文.结构静力弹塑性分析(Pushover)的原理和计算实例.建筑结构学报.2000,21(1)
[7]钱稼茹,罗文斌.静力弹塑性分析——基于性能/位移抗震设计的分析具.建筑结构.2000,30(6)
[8]欧进萍,侯纲领,吴斌.概率Pushover分析方法及在结构体系抗震可靠度评估中的应用[J].建筑结构学报.2001,28(6)
[9]魏巍,冯启民.几种Pushover分析方法对比研究[J].地震工程与工程振动.2002,22(4)
[10]朱杰江,吕西林,容柏生.复杂体型高层结构的推覆分析方法和应用[J].地震工程与工程振动.2003,23(2)
[11]汪梦甫,周锡元.高层建筑结构抗震弹塑性分析方法及抗震性能评估的研究[J].土木工程学报.2003,36(11)0
[12]Chandle A M,Lam N T.Performance-Based Design in Earthquake Engineering:A Multi-disciplinary Review.Engingneering Structure.2001,23(12)
[13]Javed A.Munshi,Satyendra K.Ghosh.Analyses of Seismic Performance of a Code Designed Reinforced Concrete Building.Engineering Structure,1998,20(7)
[14]Ahmed Ghobarah.Performance-Based Design in Earthquake Engineering:State of Development.Eingneering Structures,2001,23(8)
[15]A M Chandler,P A Mendis.Performance of Reinforced Concrete Frames Using Force and Displacement-Based Seismic Assessment Methods Engineering Structures,2000,22(4)
[16]Yehuda E.Kalay.Performance-Based Design.Automation in Construction,1999,8(4)
[17]Smith K G.Innovation in Earthquake Resistant Concrete Structure Design Philosophies:A Century of Progress Since Hennebique's Patent.Engineering Structure,2003,23(1)
[18]李国强,沈祖炎.高层建筑抗震设计的发展趋势.建筑结构学报,1992,13(4)
[19]魏琏,等主编.高层及多层钢筋混凝土建筑抗震设计手册.北京:地震工业出版社.1985.
[20]王锐.基于性能的多高层混凝土建筑结构非线性地震反应分析方法的研究.湖南大学硕士学位论文.2005.10
[21]李应斌.钢筋混凝土结构基于性能的抗震设计理论与应用研究[D].合肥工业大学硕士学位论文.2001
[22]种迅.基于性能抗震设计种建筑结构弹塑性反应简化分析方法研究[D].西安建筑科技大学博士学位论文.2003
[23]高层建筑混凝土结构技术规范(JGJ3-2002).中华人民共和国建设部.2002
[24]郭辉.基于性能的高层建筑结构抗震设计理论和应用方法研究.西安建筑科技大学.2007.6
[25]叶献国,周锡元.建筑结构地震反应简化分析方法的进一步改进.合肥工业大学学报(自然科学版),2000,23(2):149-153.
[26]李应斌,刘伯权,史庆轩.基于结构性能的抗震设计理论研究与展望[J].地震工程与工程震动.2001,21(4)
[27]ATC.Seismic Evaluation and Petrofit of Concrete Buildings[R].Applied Technology Council,RedwoodCity,California,1996.
[28]Chopra A.K.,Goel R.K.Capacity-Demand-Diagram Methods for Estimating Seismic Deformation of Inelastic Structure:SDF Systems Report No.PEER-1999/02[R].Pacific Earthquake Engineering Research Center,University of California Berkely,1999
[29]R.S.Lawson,V.Vance,H.Krawinkler.Nonlinear static Pushover analysis-Why,When and how?[C]Proc.5th U.S.Conference on Earthquake Engineering,Chicago,1994
[30]A.S.Maoghadam,W.K.Tso.Damage assessment of eccentric multistory Buildings using 3-D Pushover analysis[C],11th World Conference on Earthquake Engineering.Mexico,1996
[31]Skokan M J,Hart G C,Reliability of nonlinear static methods for the seismic performance performance prediction of steel frame buildings,Proceedings of the 12th World Conference of Earthquake Engineering.Paper No.1972,Auckland,New Zealand,2000.
[32]Krawinkler H,Seneviratna G D P K,Pros and cons of a pushover analysis of seismic performance evaluation,Engineering Structures.1998,20(4-6)
[33]曲卓杰,吴胜兴.关于结构弹塑性分析(Pushover)的探讨[J].现代地震工程进展.2002.10(3)
[34]李康宁,洪亮.结构三维弹塑性分析方法及其在建筑物抗震害研究中的应用[J].建筑结构,2001,15(3)
[35]熊向阳,戚振华.侧向荷载分布方式对静力弹塑性分析结果的影响[J].建筑科学,2001,17(5)
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