脉冲型地震动的潜在破坏能分析
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摘要
为研究预估脉冲型地震动破坏性的方法,选取Northridge地震的3条脉冲型和3条非脉冲型地震记录(峰值加速度统一调整到200gal),对比了它们的V2时-频反应谱(V2TFRS)。根据V2TFRS定义"累计动能曲线",然后结合结构振型质量参与系数,提出了地震动"潜在破坏能(PDE)"的概念。通过PDE定量地预测所选地震记录对一12层RC框架结构的潜在破坏性,并通过弹塑性时程分析结果进行了验证。结果表明,V2时-频反应谱(V2TFRS)和累计动能曲线均可用来研究脉冲型地震动的动力特性。潜在破坏能(PDE)将所选地震动特性与所分析的结构特性结合起来,有效地反应地震动的工程特性,能够定量地预测地震动潜在破坏性大小。
In order to study the method of predicting the destructiveness of pulse-like ground motions,three records of pulse-like ground motions and another three records of non-pulse-like ground motions( with the peak acceleration adjusted to 200gal) from Northridge earthquake were selected for the comparison of their V2 Time-Frequency Response Spectrum( V2 TFRS). Based on the V2 TFRS,the concept of accumulative kinetic energy curve was defined. By incorporating with the modal participating mass ratio,the concept of potential damage energy( PDE) was put forward.The potential destructiveness from the selected ground motions to a 12-storey RC frame structure was quantitatively predicted based on the PDE,and furthermore,the predictions were verified by the elasto-plastic time-history analysis.The results show that both V2 TFRS and the accumulative kinetic energy curves can be used to study the dynamic characteristics of pulse-like ground motions. By combining the characteristics of selected ground motions and the characteristics of analyzed structure,PDE can effectively reflect the engineering characteristics of seismic ground motions and quantitatively predict the degree of potential destructiveness from the seismic ground motions.
In order to study the method of predicting the destructiveness of pulse-like ground motions,three records of pulse-like ground motions and another three records of non-pulse-like ground motions( with the peak acceleration adjusted to 200gal) from Northridge earthquake were selected for the comparison of their V2 Time-Frequency Response Spectrum( V2 TFRS). Based on the V2 TFRS,the concept of accumulative kinetic energy curve was defined. By incorporating with the modal participating mass ratio,the concept of potential damage energy( PDE) was put forward.The potential destructiveness from the selected ground motions to a 12-storey RC frame structure was quantitatively predicted based on the PDE,and furthermore,the predictions were verified by the elasto-plastic time-history analysis.The results show that both V2 TFRS and the accumulative kinetic energy curves can be used to study the dynamic characteristics of pulse-like ground motions. By combining the characteristics of selected ground motions and the characteristics of analyzed structure,PDE can effectively reflect the engineering characteristics of seismic ground motions and quantitatively predict the degree of potential destructiveness from the seismic ground motions.
引文
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[2]Bertero V V,Mahin S A,Herrera R A.Aseismic design implications of near-fault San Fernando earthquake records[J].Earthquake Engineering&Structural Dynamics,1978,6(1):31-42
[3]Anderson J C,Bertero V V.Uncertainties in establishing design earthquakes[J].Journal of Structural Engineering,1987,113(8):1709-1724
[4]Hall J F,Heaton T H,Halling M W,et al.Near-source ground motion and its effects on flexible buildings[J].Earthquake Spectra,1995,11(4):569-605
[5]Iwan W D.Drift spectrum:measure of demand for earthquake ground motions[J].Journal of Structural Engineering,1997,123(4):397-404
[6]Malhotra P K.Response of buildings to near-field pulselike ground motions[J].Earthquake Engineering&Structural Dynamics,1999,28(11):1309-1326
[7]Mavroeidis G P,Dong G,Papageorgiou A S.Near-fault ground motions,and the response of elastic and inelastic single-degree-of-freedom(SDOF)systems[J].Earthquake Engineering&Structural Dynamics,2004,33(9):1023-1049
[8]Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of the Seismological Society of America,2007,97(5):1486-1501
[9]Mazza F,Vulcano A.Effects of near-fault ground motions on the nonlinear dynamic response of base-isolated RC framed buildings[J].Earthquake Engineering&Structural Dynamics,2012,41(2):211-232
[10]Champion C,Liel A.The effect of near-fault directivity on building seismic collapse risk[J].Earthquake Engineering&Structural Dynamics,2012,41(10):1391-1409
[11]Calugaru V,Panagiotou M.Response of tall cantilever wall buildings to strong pulse type seismic excitation[J].Earthquake Engineering&Structural Dynamics,2012,41(9):1301-1318
[12]Luo Q F,Li S D.Time-frequency response spectrum analysis of seismic wave[C]//Proceedings of the 13th World Conference on Earthquake Engineering.Vancouver B.C.,Canada,2004:1479
[13]邱志刚,罗奇峰.地震波的归一化时-频反应谱[J].振动工程学报,2014,27(1):91-95(Qiu Zhigang,Luo Qifeng.Normalized time-frequency response spectrum of seismic waves[J].Journal of Vibration Engineering,2014,27(1):91-95(in Chinese))
[14]GB 50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010(GB 50011—2010 Code for seismic design of buildings[S].Beijing:China Architecture&Building Press,2010(in Chinese))
[15]邱志刚,罗奇峰.归一化时-频反应谱与结构损伤曲线的应用[J].东南大学学报:自然科学版,2013,43(1):165-168(Qiu Zhigang,Luo Qifeng.Application of normalized time-frequency response spectrum and structural damage curve[J].Journal of Southeast University:Natural Science Edition,2013,43(1):165-168(in Chinese))
[16]邱志刚.归一化时-频反应谱及其应用[D].上海:同济大学,2014(Qiu Zhigang.Normalized time-frequency response spectrum and its applications[D].Shanghai:Tongji University,2014(in Chinese))
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