大型汽轮发电机框架式基础静力弹塑性分析
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摘要
阐述了能力谱pushover分析方法的基本原理和过程,以宁夏大坝大型汽轮发电机框架式基础为例,采用静力弹塑性分析方法对其进行抗震性能评估.研究结果表明:大型汽轮发电机框架式基础振型参与质量集中分布在前两阶振型,结构动力行为类似于单自由度体系(SDOF);罕遇地震作用下,汽轮发电机框架式基础最大位移小于其限值;基础结构的塑性铰主要出现在梁柱节点及柱脚,屈服程度较轻;平台层主梁尚未出现塑性铰.对静力和动力弹塑性分析两种方法的结果进行了比较,探讨静力弹塑性分析在大型汽轮发电机框架式基础抗震性能评估的适用性,为汽机基础的抗震性能分析提供了参考.
The basic principle and procedure of capacity spectrum pushover analysis method were introduced.A case study of aseismic evaluation of Ningxia Daba large-framed foundation of steam turbine generator was performed by static elastoplastic analysis method.Results show that:the main modal participation mass concentrates in the first two modes;and the dynamic behavior of structure is similar to a single degree of freedom;the maximum displacement of foundation of steam turbine generator is much less than the limit value under severe earthquake;few members of the main structure yield slightly;a few plastic hinges are formed in the joints and feet of columns.The applicability of pushover analysis is discussed by comparing dynamic elastoplastic analysis results and static elastoplastic analysis results,which may be a reference for future aseismic performance study of large-framed foundation of steam turbine generator.
The basic principle and procedure of capacity spectrum pushover analysis method were introduced.A case study of aseismic evaluation of Ningxia Daba large-framed foundation of steam turbine generator was performed by static elastoplastic analysis method.Results show that:the main modal participation mass concentrates in the first two modes;and the dynamic behavior of structure is similar to a single degree of freedom;the maximum displacement of foundation of steam turbine generator is much less than the limit value under severe earthquake;few members of the main structure yield slightly;a few plastic hinges are formed in the joints and feet of columns.The applicability of pushover analysis is discussed by comparing dynamic elastoplastic analysis results and static elastoplastic analysis results,which may be a reference for future aseismic performance study of large-framed foundation of steam turbine generator.
引文
[1]中华人民共和国国家标准.建筑抗震设计规范(GB50011-2001)[S].北京:中国建筑工业出版社,2008.
[2]北京工业大学,国网北京电力建设研究院,北京国电华北电力工程有限公司.宁夏大坝电厂三期扩建工程2×600 MW机组汽机基础数模及物模试验研究(四)抗震性能试验[R].北京:2008.
[3]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005.
[4]Fema.Nehrp guidelines for the seismic rehabilitationof buildings[R].FEMA-356,Washington D.C.,2000.
[5]ATC.Seismic Evaluation and retrofit of concretebuildings[R].Report No.ATC-40.Applied Tech-nology Council,Redwood City,California,1996.
[6]Fajfar P.Capacity spectrum method based on inelas-tic demand spectra[J].Earthquake Engineering&Structural Dynamics,1999,28(9):979-993.
[7]Krawinkler H,Seneviratna G.Pros and cons of apushover analysis of seismic performance evaluation[J].Engineering Structures,1998,20(4-6):452-464.
[8]Chopra A K,Goel R K.A modal pushover analysisprocedure to estimate seismic demands for unsymmet-ric-plan buildings[J].Earthquake Engineering&Structural Dynamics,2004,33(15):1429.
[2]北京工业大学,国网北京电力建设研究院,北京国电华北电力工程有限公司.宁夏大坝电厂三期扩建工程2×600 MW机组汽机基础数模及物模试验研究(四)抗震性能试验[R].北京:2008.
[3]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005.
[4]Fema.Nehrp guidelines for the seismic rehabilitationof buildings[R].FEMA-356,Washington D.C.,2000.
[5]ATC.Seismic Evaluation and retrofit of concretebuildings[R].Report No.ATC-40.Applied Tech-nology Council,Redwood City,California,1996.
[6]Fajfar P.Capacity spectrum method based on inelas-tic demand spectra[J].Earthquake Engineering&Structural Dynamics,1999,28(9):979-993.
[7]Krawinkler H,Seneviratna G.Pros and cons of apushover analysis of seismic performance evaluation[J].Engineering Structures,1998,20(4-6):452-464.
[8]Chopra A K,Goel R K.A modal pushover analysisprocedure to estimate seismic demands for unsymmet-ric-plan buildings[J].Earthquake Engineering&Structural Dynamics,2004,33(15):1429.
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