基于目标反应谱的超高层结构随机地震反应分析
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摘要
目前有关超高层结构的地震反应研究大多限于确定性问题。分别选用上海抗震设计反应谱和软土场地拟合反应谱作为目标反应谱,用迭代方法求取与目标反应谱相对应的功率谱密度函数,按Clough-Penzien平稳随机地震动模型拟合并给出相应谱参数,采用Ansys软件建立上海某超高层建筑结构的三维有限元分析模型,以文中拟合的平稳随机地震动功率谱密度作为输入,对超高层结构进行了随机地震反应分析,探讨了不同类型的随机地震作用下超高层建筑结构地震反应的差异、以及结构的功率谱反应随层高的变化情况,得到了有工程参考价值的结果。
At present,due to the lack of long-period ground motion records,the research results on seismic response characteristics of high-rise structures under random seismic input get quite few.The Shanghai earthquake design response spectrum and the fitting long-period response spectrum of soft soil site were chosen as target response spectrum,and the iterating method was used to compute the relative power spectral density functions.Then,the Clough-Penzien model was selected to fit the power spectral density functions,and corresponding spectral parameters were given.Based on this,the Ansys software was used to establish the three-dimensional finite element model of a super high-rise building located in Shanghai,and the random seismic response of the super high-rise structure was analyzed.the random seismic response characteristic of the super high-rise structure under different power spectral density and the response variation of floor power spectral density were discussed,and some valuable conclusions for engineering were acquired.
At present,due to the lack of long-period ground motion records,the research results on seismic response characteristics of high-rise structures under random seismic input get quite few.The Shanghai earthquake design response spectrum and the fitting long-period response spectrum of soft soil site were chosen as target response spectrum,and the iterating method was used to compute the relative power spectral density functions.Then,the Clough-Penzien model was selected to fit the power spectral density functions,and corresponding spectral parameters were given.Based on this,the Ansys software was used to establish the three-dimensional finite element model of a super high-rise building located in Shanghai,and the random seismic response of the super high-rise structure was analyzed.the random seismic response characteristic of the super high-rise structure under different power spectral density and the response variation of floor power spectral density were discussed,and some valuable conclusions for engineering were acquired.
引文
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[3]张振炫,长周期地震动特性与超高层建筑结构的地震响应研究[D].同济大学硕士学位论文,2010.
[4]ZHANG Z X,CHEN Q J.Long-period response spectrum and earthquake response analysis of super high-rise building[C].Advanced Ma-terials Research,2011,163-167:3964-3971.
[5]上海建筑抗震设计规程(DGJ0892003)[S].上海:上海市建设和管理委员会,2003
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[7]KAUL M.Stochastic characterization of earthquakes through their response spectrum[J].Earthquake Engineering and Structural Dy-namics,1978,6(5):497-509.
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[10]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].New York:McGraw-Hill,1975.
[11]王君杰,江近仁.关于地震动平稳自功率谱模型的注记[J].世界地震工程,1997,13(2):37-40.
[2]李春锋,张旸.长周期地震动衰减关系研究的迫切性[J].地震地磁观测与研究,2006,27(3):1-8.
[3]张振炫,长周期地震动特性与超高层建筑结构的地震响应研究[D].同济大学硕士学位论文,2010.
[4]ZHANG Z X,CHEN Q J.Long-period response spectrum and earthquake response analysis of super high-rise building[C].Advanced Ma-terials Research,2011,163-167:3964-3971.
[5]上海建筑抗震设计规程(DGJ0892003)[S].上海:上海市建设和管理委员会,2003
[6]孙景江,江近仁.与规范反应谱相对应的金井清谱的谱参数[J].世界地震工程,1990,8(1):42-48.
[7]KAUL M.Stochastic characterization of earthquakes through their response spectrum[J].Earthquake Engineering and Structural Dy-namics,1978,6(5):497-509.
[8]ARMEN,DER K.Structural response to stationary excitation[J].Journal of the Engineering Mechanics Division,1980,EM6:203-235.
[9]李国强,陈素文,李杰等.上海金茂大厦结构动力特性测试[J].土木工程学报,2000,33(2):35-39.
[10]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].New York:McGraw-Hill,1975.
[11]王君杰,江近仁.关于地震动平稳自功率谱模型的注记[J].世界地震工程,1997,13(2):37-40.
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