地震动非相干效应对核电站厂房地震响应的影响
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摘要
地震动的空间变化可能引起结构物特殊的地震响应,因此大尺寸结构物或核电站厂房等重要构筑物的抗震分析中应考虑地震动的空间变化。以国内某核电站反应堆厂房为例,分别进行考虑地震动非相干效应和不考虑该效应的结构抗震分析,并选取主要标高处地震响应谱进行对比,研究5种地基条件下地震动非相干效应对结构响应的影响。研究结果表明,非相干效应对结构水平向和竖向地震响应均有显著影响,表现为考虑非相干效应后,结构水平向和竖向地震响应在高频区域均明显降低;在较软地基条件下,非相干效应对结构高标高处水平地震响应的影响程度大于低标高处,对竖向响应的影响则随着标高增加而减小;在高频区域,考虑地震动非相干效应后,结构水平向和竖向响应的降幅随着地基刚度增加而增加。
The seismic analysis for large-dimensional structures or important structures like nuclear power plant buildings should consider the spatial variation of the input ground motion.Taking the reactor building of a nuclear power plant as example,the seismic analysis with or without considering the incoherence effect of seismic motion respectively were performed in this paper under five site conditions.In the analysis,the floor response spectra of two key elevations in the building were chosen for studying the effect of incoherency on structural seismic response.The results show that incoherence effect has a significant effect on both horizontal and vertical responses.Due to the seismic motion incoherency,both the horizontal and vertical responses in high frequency region decrease.For softer foundation,the effect of incoherency on the horizontal response at higher elevation is larger than that at lower elevation,and the effect of incoherency on the vertical response decreases with the increase of elevation.Considering the incoherence effect in analysis,the decreasing amplitude of the seismic response in high frequency region becomes larger as the foundation stiffness increases.
The seismic analysis for large-dimensional structures or important structures like nuclear power plant buildings should consider the spatial variation of the input ground motion.Taking the reactor building of a nuclear power plant as example,the seismic analysis with or without considering the incoherence effect of seismic motion respectively were performed in this paper under five site conditions.In the analysis,the floor response spectra of two key elevations in the building were chosen for studying the effect of incoherency on structural seismic response.The results show that incoherence effect has a significant effect on both horizontal and vertical responses.Due to the seismic motion incoherency,both the horizontal and vertical responses in high frequency region decrease.For softer foundation,the effect of incoherency on the horizontal response at higher elevation is larger than that at lower elevation,and the effect of incoherency on the vertical response decreases with the increase of elevation.Considering the incoherence effect in analysis,the decreasing amplitude of the seismic response in high frequency region becomes larger as the foundation stiffness increases.
引文
[1]胡聿贤.地震工程学[M].第二版.北京:地震出版社,2006(Hu Yuxian.Earthquake Engineering[M].2ndEdition.Beijing:Seismological Press,2006(in Chinese))
[2]屈铁军,王前信.多点输入地震反应分析研究的进展[J].世界地震工程,1993,9(1):30-36
[3]朱镜清.结构抗震分析原理[M].北京:地震出版社,2002
[4]Ghiocel D M,Short S,Hardy G.Seismic motionincoherency effects on ssi response of nuclear islands withsignificant mass eccentricities and different embedmentlevels[C]//20th International Conference on StructuralMechanics in Reactor Technology(SMiRT 20).Espoo,Finland,2009
[5]Ghiocel D M.Seismic motion incoherency effects on soil-structure interaction(SSI)response of nuclear power plantbuildings[C]//The 10th International Conference inStructural Safety and Reliability,ICOSSAR 2009.Osaka,Japan,2009
[6]Ghiocel D M,Li D,Cooglerb K,et al.Seismic motionincoherency effects for AP1000 nuclear island complex[C]//20th International Conference on StructuralMechanics in Reactor Technology,SMiRT 20.Espoo,Finland,2009
[7]GB 50267—97核电厂抗震设计规范[S].北京:中国计划出版社,1998(GB 50267—97 Code for seismic designof nuclear power plants[S].Beijing:China PlanningPress,1998(in Chinese))
[8]Abrahamson N A,Schneider J F,Step PJ C.Empiricalspatial coherency functions for application to soil-structureinteraction analyses[J].Earthquake Spectra,1991,7(1):1-27
[9]陈原.工程场地地震动相干函数研究[D].上海:同济大学,2005
[10]Ghiocel D M.ACS SASSI NQA(Version 2.3.0)UserManuals Revision 3.0[M].USA:Ghiocel PredictiveTechnologies,Inc.,2010
[2]屈铁军,王前信.多点输入地震反应分析研究的进展[J].世界地震工程,1993,9(1):30-36
[3]朱镜清.结构抗震分析原理[M].北京:地震出版社,2002
[4]Ghiocel D M,Short S,Hardy G.Seismic motionincoherency effects on ssi response of nuclear islands withsignificant mass eccentricities and different embedmentlevels[C]//20th International Conference on StructuralMechanics in Reactor Technology(SMiRT 20).Espoo,Finland,2009
[5]Ghiocel D M.Seismic motion incoherency effects on soil-structure interaction(SSI)response of nuclear power plantbuildings[C]//The 10th International Conference inStructural Safety and Reliability,ICOSSAR 2009.Osaka,Japan,2009
[6]Ghiocel D M,Li D,Cooglerb K,et al.Seismic motionincoherency effects for AP1000 nuclear island complex[C]//20th International Conference on StructuralMechanics in Reactor Technology,SMiRT 20.Espoo,Finland,2009
[7]GB 50267—97核电厂抗震设计规范[S].北京:中国计划出版社,1998(GB 50267—97 Code for seismic designof nuclear power plants[S].Beijing:China PlanningPress,1998(in Chinese))
[8]Abrahamson N A,Schneider J F,Step PJ C.Empiricalspatial coherency functions for application to soil-structureinteraction analyses[J].Earthquake Spectra,1991,7(1):1-27
[9]陈原.工程场地地震动相干函数研究[D].上海:同济大学,2005
[10]Ghiocel D M.ACS SASSI NQA(Version 2.3.0)UserManuals Revision 3.0[M].USA:Ghiocel PredictiveTechnologies,Inc.,2010
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