地震波基线漂移的处理方法
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摘要
由于受到采集仪器低频噪声、环境背景信号、人为处理误差及初始加速度等的影响,由地震加速度记录积分得到的地震波位移时程曲线会出现严重的零线漂移现象.因此,在结构地震响应的时程分析中,加速度记录需要进行校正.作者在Wilson校正处理方法基础上,提出了一种新的地震波基线漂移的处理方法,改善了加速度记录的积分性质,保证了由加速度积分得到的速度和位移时程终点均为零,并保持了地震波加速度的峰值、持时、频谱等特性.通过在实际工程的应用,验证了该校正方法的合理性.
The displacement curve integrated from the acceleration curve will present a serious problem of baseline drift due to the influence of low-frequency noise signal error from the seismic acquisition equipments,environmental background signal error,human error and the initial acceleration.Therefore,the acceleration record needs to be corrected so that it can be applied accurately in time history seismic analysis of the structure.Based on the evaluation of the Wilson's correction method,a new correction method is proposed to improve the integral performance of acceleration record.This new method can remove the baseline drifts of velocity and displacement curves.Moreover,the characteristics of seismic acceleration record are retained,including the acceleration peak,duration,and frequency features.Finally,a practical application is given to verify the effectiveness of the proposed method.
The displacement curve integrated from the acceleration curve will present a serious problem of baseline drift due to the influence of low-frequency noise signal error from the seismic acquisition equipments,environmental background signal error,human error and the initial acceleration.Therefore,the acceleration record needs to be corrected so that it can be applied accurately in time history seismic analysis of the structure.Based on the evaluation of the Wilson's correction method,a new correction method is proposed to improve the integral performance of acceleration record.This new method can remove the baseline drifts of velocity and displacement curves.Moreover,the characteristics of seismic acceleration record are retained,including the acceleration peak,duration,and frequency features.Finally,a practical application is given to verify the effectiveness of the proposed method.
引文
[1]Hung-Chie Chiu.Stable Baseline Correction of DigitalStrong-Motion Data[J].Bulletin of the Seismological So-ciety of America,1997,87(4):932-944.
[2]David M Boore,Christopher D Stephens,William B Joyn-er.Comments on Baseline Correction of Digital Strong-Motion Data Examples from the 1999 Hector Mine Califor-nia Earthquake[J].Bulletin of the Seismological Society ofAmerica,2002,92(4):1543-1560.
[3]范留明,李宁,黄润秋.人造地震动合成中的位移误差分析[J].工程地质学报,2003,11(1):79-84.FAN Liuming,LI Ning,HUANG Ruqiu.Analysis ofComputation Errors in Synthesizing Artificial Ground Mo-tion[J].Journal of Engineering Geology,2003,11(1):79-84.(in Chinese)
[4]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170-174.TIAN Yuji,YANG Qingshan.Analysis of Models andMethods for Structural Seismic Responses[J].Journal ofEngineering Mechanics,2005,22(6):170-174.(in Chi-nese)
[5]周雍年,章文波,于海英.数字强震仪的长周期误差分析[J].地震工程与工程振动,1997,12(2):1-9.ZHOU Yongnian,ZHANG Wenbo,YU Haiying.Analysisof Long-Period Error for Accelerograms Recorded by Dig-ital Seismographs[J].Earthquake Engineering and Engi-neering Vibration,1997,12(1):1-9.(in Chinese)
[6]李建波,陈健云,林皋.相互作用分析中地震动输入长周期校正研究[J].大连理工大学学报,2004,44(4):550-555.LI Jianbo,CHEN Jianyun,LIN Gao.Study of Long-Pe-riond Correction of Seismic Accelerogram for Dynamic In-teraction Analysis[J].Journal of Dalian University ofTechnology,2004,44(4):550-555.(in Chinese)
[7]Edward L Wilson.Three Dimensional Static&DynamicAnalysis of Structure[M].3rd ed.California:Computersand Structures,Inc.,2002:392-399.
[2]David M Boore,Christopher D Stephens,William B Joyn-er.Comments on Baseline Correction of Digital Strong-Motion Data Examples from the 1999 Hector Mine Califor-nia Earthquake[J].Bulletin of the Seismological Society ofAmerica,2002,92(4):1543-1560.
[3]范留明,李宁,黄润秋.人造地震动合成中的位移误差分析[J].工程地质学报,2003,11(1):79-84.FAN Liuming,LI Ning,HUANG Ruqiu.Analysis ofComputation Errors in Synthesizing Artificial Ground Mo-tion[J].Journal of Engineering Geology,2003,11(1):79-84.(in Chinese)
[4]田玉基,杨庆山.地震地面运动作用下结构反应的分析模型[J].工程力学,2005,22(6):170-174.TIAN Yuji,YANG Qingshan.Analysis of Models andMethods for Structural Seismic Responses[J].Journal ofEngineering Mechanics,2005,22(6):170-174.(in Chi-nese)
[5]周雍年,章文波,于海英.数字强震仪的长周期误差分析[J].地震工程与工程振动,1997,12(2):1-9.ZHOU Yongnian,ZHANG Wenbo,YU Haiying.Analysisof Long-Period Error for Accelerograms Recorded by Dig-ital Seismographs[J].Earthquake Engineering and Engi-neering Vibration,1997,12(1):1-9.(in Chinese)
[6]李建波,陈健云,林皋.相互作用分析中地震动输入长周期校正研究[J].大连理工大学学报,2004,44(4):550-555.LI Jianbo,CHEN Jianyun,LIN Gao.Study of Long-Pe-riond Correction of Seismic Accelerogram for Dynamic In-teraction Analysis[J].Journal of Dalian University ofTechnology,2004,44(4):550-555.(in Chinese)
[7]Edward L Wilson.Three Dimensional Static&DynamicAnalysis of Structure[M].3rd ed.California:Computersand Structures,Inc.,2002:392-399.
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