一种考虑局部场地收敛性的多点地震动合成方法
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摘要
提出一种符合实际地震动传播特点的多点地震动合成方法。目前的非平稳空间相关多点地震动合成方法在局部场地上不具备收敛性,与实际的地震波传播机制相矛盾。通过修正随机相位角,使生成的多点地震动在局部场地上具备收敛性,给出了未知和已知相位差谱统计规律两种情况下非平稳多点地震动的合成方法,进一步提出了基于实际地震记录的空间相关多点地震动合成方法。采用本文方法进行了基于美国Northridge地震和我国集集地震的多点地震动模拟研究,结果表明方法具有良好的局部收敛性,可用于大尺度结构的多点输入分析。
A novel method to simulate non-stationary spatial correlative time histories of multi-point earthquake ground motion is presented.The currently used method is non-convergent in local fields,which contradicts the propagating mechanism of the real earthquake wave.By modifying random phase angle,a local convergent approach is proposed to simulate non-stationary multi-point earthquake ground motion.Two cases of the known phase-difference spectrum and the unknown phase-difference spectrum are studied herein.A new method to simulate time histories of multi-point ground motion using actual earthquake records is then developed.The proposed method is applied to the real ground motion records of the American Northridge earthquake and the Chinese ChiChi earthquake.The results indicate that the proposed method has the local convergence of the simulated ground motions,it can be used for multi-support excitation analysis of large scale structures.
A novel method to simulate non-stationary spatial correlative time histories of multi-point earthquake ground motion is presented.The currently used method is non-convergent in local fields,which contradicts the propagating mechanism of the real earthquake wave.By modifying random phase angle,a local convergent approach is proposed to simulate non-stationary multi-point earthquake ground motion.Two cases of the known phase-difference spectrum and the unknown phase-difference spectrum are studied herein.A new method to simulate time histories of multi-point ground motion using actual earthquake records is then developed.The proposed method is applied to the real ground motion records of the American Northridge earthquake and the Chinese ChiChi earthquake.The results indicate that the proposed method has the local convergence of the simulated ground motions,it can be used for multi-support excitation analysis of large scale structures.
引文
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[2]Hao H,Oliveira C S,Penzien J.Multiple-station groundmotion processing and simulation based on SMART-1 arraydata[J].Nuclear Engineering and Design,1989,111(3):293—310.
[3]屈铁军,王前信.空间相关的多点地震动合成(I)基本公式[J].地震工程与工程振动,1998,18(1):8—15.
[4]屈铁军,王前信.空间相关的多点地震动合成(Ⅱ)──合成实例[J].地震工程与工程振动,1998,18(2):25—32.
[5]姜海鹏,王航,杨庆山.空间变异地震作用下大型连续钢构桥的延性性能研究[J].铁道工程学报,2001,(2):37—45.
[6]倪永军,朱.考虑时间-空间变化的人工随机场模拟[J].地震学报,2002,24(4):407—412.
[7]夏友柏,王年桥,张尚根.一种合成多点地震动时程的方法[J].世界地震工程,2002,18(1):119—122.
[8]刘先明,叶继红,李爱群.空间相关多点地震动合成的简化方法[J].工程抗震,2003,(1):30—36.
[9]屈铁军.地面运动的空间变化特征研究及地线管线地震反应分析[D].哈尔滨:国家地震局工程力学研究所,1995.
[10]田景元等.土石坝二维多点输入地震反应分析[J].岩土力学,2004,25(1):99—104.
[11]Saragoni G R and Hart G C.Simulation of artificial earth-quakes[J],Earthquake Engineering and Structure Dynam-ics,1974,2(3):249—267.
[12]Donald J.Berndt,James Clifford.Finding patterns in timeseries:a dynamic programming approach[M],Advances inKnowledge Discovery and Data Mining,AAAI Press,1996:229—248.
[13]赵凤新,胡聿贤,李小军.地震动相位差谱的统计规律[J].自然灾害学报,1995,4:49—56.
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