基于分解方法的近断层区结构地震反应分析
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摘要
近断层长周期地震动是一类较特殊的破坏性地震动,对长周期结构的破坏尤为显著。为深入分析近断层地震动的工程特性,基于小波分析中的多尺度分析方法对近期12次典型破坏性地震的53条近断层地震动进行了分解,得到266条地震动分量。通过研究地震动分量的幅值、周期和双规准谱的特征,提出了一种评估近断层区建筑结构地震反应的方法。这种方法能够给出单自由度弹性体系在周期为0.3~20s地震动分量作用下的最大绝对加速度反应,并综合考虑了场地和断层距的影响,给出了简洁的函数表达式,为近断层区建筑结构尤其是长周期结构的设计提供了参考依据。
The near-fault ground motion with long period is one special kind of destructive ground motions and has significant damage to long period structures particularly.For further research on the effects of near-fault ground motion to structures,53 typical near-fault ground motions that selected from 12 recent major earthquakes were decomposed based on multi-scale analysis method in wavelet theory,and a total of 266 ground motion components were obtained.A method to estimate seismic response of buildings that constructed in near-fault region was proposed by research on the characteristics of ground motion components,including amplitude,period and bi-normalized response spectra.This method is able to give the maximum absolute acceleration response of single degree freedom elastic system under the effect of ground motion components with period range from 0.3sto20 s.The impact of site and rupture distance was considered,and a simple function was given.This method can provide detailed reference for the design of near-fault region structures,especially for long period structures.
The near-fault ground motion with long period is one special kind of destructive ground motions and has significant damage to long period structures particularly.For further research on the effects of near-fault ground motion to structures,53 typical near-fault ground motions that selected from 12 recent major earthquakes were decomposed based on multi-scale analysis method in wavelet theory,and a total of 266 ground motion components were obtained.A method to estimate seismic response of buildings that constructed in near-fault region was proposed by research on the characteristics of ground motion components,including amplitude,period and bi-normalized response spectra.This method is able to give the maximum absolute acceleration response of single degree freedom elastic system under the effect of ground motion components with period range from 0.3sto20 s.The impact of site and rupture distance was considered,and a simple function was given.This method can provide detailed reference for the design of near-fault region structures,especially for long period structures.
引文
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[25]Irwansyah E,Winarko E,Rasjid Z E,et al.Earthquake hazard zonation using peak ground acceleration(PGA)approach[J].Journal of Physics:Conference Series.IOP Publishing,2013,423(1):012067.
[26]Xu L J,Xie L L.Bi-normalized response spectral characteristics of the 1999Chi-Chi earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147—155.
[2]Luco N,Cornell C A.Structure-specific scalar intensity measures for near-source and ordinary earthquake ground motions[J].Earthquake Spectra,2007,23(2):357—392.
[3]Akkar S,Yazgan U,Gülkan P.Drift estimates in frame buildings subjected to near-fault ground motions[J].Journal of Structural Engineering,2005,131(7):1 014—1 024.
[4]Xu L J,Rodriguez-Marek A,Xie L L.Design spectra including effect of rupture directivity in near-fault region[J].Earthquake Engineering and Engineering Vibration,2006,5(2):159—170.
[5]Zamora M,Riddell R.Elastic and inelastic response spectra considering near-fault effects[J].Journal of Earthquake Engineering,2011,15(5):775—808.
[6]Adanur S,Altunisik A C,Bayraktar A,et al.Comparison of near-fault and far-fault ground motion effects on geometrically nonlinear earthquake behavior of suspension bridges[J].Natural Hazards,2012,64(1):593—614.
[7]Cavdar■.Probabilistic sensitivity analysis of two suspension bridges in Istanbul,Turkey to near-and far-fault ground motion[J].Natural Hazards and Earth System Sciences,2012,12(2):459—473.
[8]王君杰,王前信,江近仁.大跨拱桥在空间变化地震动下的响应[J].振动工程学报,1995,8(2):119—126.Wang J J,Wang Q X,Jiang J R.Random response of long-span arch bridge under spatially variable seismic excitations[J].Journal of Vibration Engineering,1995,8(2):119—126.
[9]谢礼立,周雍年,胡成祥,等.地震动反应谱的长周期特性[J].地震工程与工程振动,1990,10(1):1—20.Xie L L,Zhou Y N,Hu C X,et al.Ground motion response spectral characteristics of long-period[J].Earthquake Engineering and Engineering Vibration,1990,10(1):1—20.
[10]马长飞,谭平,张亚辉,等.近场地震作用下考虑P-Δ效应的首层柱顶隔震结构地震反应分析[J].振动工程学报,2012,25(4):339—445.Ma C F,Tan P,Zhang Y H,et al.Seismic analysis of first-floor column top isolation structures subjected to near-field ground motions considering P-Δeffects[J].Journal of Vibration Engineering,2012,25(4):339—445.
[11]Xie L L,Xu L J,Rodriguez-Marek A.Representation of near-fault pulse-type ground motion[J].Earthquake Engineering and Engineering Vibration,2005,4(2):191—199.
[12]Makris N.Rigidity-plasticity-viscosity:can electrorheological dampers protect base-isolated structures from near-source ground motions?[J].Earthquake Engineering and Structural Dynamics,1997,26(5):571—591.
[13]Alavi B,Krawinkler H.Effects of near-fault ground motions on frame structures[A].Blume Center Report138[C].California,Stanford University,2001:68—85.
[14]Bozorgnia Y,Mahin S A.Ductility and strength demands of near-fault ground motions of the Northridge earthquake[A].Proceedings of the 6th US National Conference on Earthquake Engineering[C].Earthquake Engineering Research Institute,Seattle,1998.
[15]Baker J W.Quantitative classification of near-fault ground motions using wavelet analysis[J].Bulletin of Seismological Society of America,2007,97(5):1 486—1 501.
[16]Yaghmaei-Sabegh S.Detection of pulse-like ground motions based on continues wavelet transform[J].Journal of Seismology,2010,14(4):715—726.
[17]Mollaioli F,Bosi A.Wavelet analysis for the characterization of forward-directivity pulse-like ground motions on energy basis[J].Meccanica,2012,47(1):203—219.
[18]Iervolino I,Chioccarelli E,Baltzopoulos G.Inelastic displacement ratio of near-source pulse-like ground motions[J].Earthquake Engineering and Structural Dynamics,2012,41(15):2 351—2 357.
[19]Maniatakis C A,Spyrakos C C.A new methodology to determine elastic displacement spectra in the nearfault region[J].Soil Dynamics and Earthquake Engineering,2012,35:41—58.
[20]Rupakhety R,Sigurdsson S U,Papageorgiou A S,et al.Quantification of ground-motion parameters and response spectra in the near-fault region[J].Bulletin of Earthquake Engineering,2011,9(4):893—930.
[21]徐龙军.统一抗震设计谱理论及其应用[D].哈尔滨:哈尔滨工业大学,2006.Xu L J.Theory and applications of uniform seismic design spectrum[D].Harbin:Harbin Institute of Technology,2006.
[22]Meyer Y.Wavelets:Algorithms and Applications[M].Philadelphia:SIAM,1993.
[23]Mallat S G.A theory of multiresolution signal decomposition:the wavelet representation[J].IEEE Transactions on Pattern Analysis and Machine Intelligence,1989,11(7):674—693.
[24]Yuen K V,Mu H Q.Peak ground acceleration estimation by linear and nonlinear models with reduced order Monte Carlo simulation[J].Computer-Aided Civil and Infrastructure Engineering,2011,26(1):30—47.
[25]Irwansyah E,Winarko E,Rasjid Z E,et al.Earthquake hazard zonation using peak ground acceleration(PGA)approach[J].Journal of Physics:Conference Series.IOP Publishing,2013,423(1):012067.
[26]Xu L J,Xie L L.Bi-normalized response spectral characteristics of the 1999Chi-Chi earthquake[J].Earthquake Engineering and Engineering Vibration,2004,3(2):147—155.
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