用Matlab软件内部函数校正强震记录的探讨
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摘要
在标准化结构反应谱时,需要准确地确定地面地震动峰值。而在地震期间,测量地面运动时采集到的地震动加速度时程数据由于种种原因存在基线漂移问题,导致所测数据不能真实反映地面运动,由此难以确定真实地面运动峰值。通过对地震动加速度数据拟合,根据拟合后的数据计算地震速度及位移,并将计算结果分别与利用已有基线修正方法求得的速度及位移进行对比,从而确定最佳拟合次数,消除基线漂移造成影响。研究结果表明,经12次拟合修正地震动加速度求得的地震动位移峰值可用于相对位移反应谱标准化。
Standardizing response spectra of structures needs accurate peak values of ground motions.For some reasons,baseline drift exists in the time histories of earthquake acceleration records.This phenomenon results in those records cannot reflect the real ground motions.As a result,it is difficult to determine the accurate peak ground motion values.In this paper,the original acceleration records of strong ground motions are fitted and the PGVs and PGDs are calculated based on the fitted acceleration data,and then they are compared with the recorded PGVs and PGVs.Finally,the optimal fitting number is determined to eliminate the influence caused by the baseline drift.The results show that when the fitting number is 12,the resulted PGD values can be used in the standardization of relative displacement response spectra.
Standardizing response spectra of structures needs accurate peak values of ground motions.For some reasons,baseline drift exists in the time histories of earthquake acceleration records.This phenomenon results in those records cannot reflect the real ground motions.As a result,it is difficult to determine the accurate peak ground motion values.In this paper,the original acceleration records of strong ground motions are fitted and the PGVs and PGDs are calculated based on the fitted acceleration data,and then they are compared with the recorded PGVs and PGVs.Finally,the optimal fitting number is determined to eliminate the influence caused by the baseline drift.The results show that when the fitting number is 12,the resulted PGD values can be used in the standardization of relative displacement response spectra.
引文
[1]杨松涛,叶列平,钱稼茹.地震位移反应谱特性的研究[J].建筑结构,2002,32(5):47-50.
[2]施卫星,李正升,汪大绥.基础隔震位移反应谱及其应用[J].同济大学学报(自然科学版),2000,28(01):29-32.
[3]谢礼立,于双久.强震观测与分析原理[M].北京:地震出版社,1982.
[4]李大华,刘芳.力平衡加速度计强震记录仪器误差的校正[J].地震学报,1998,20(05):555-557.
[5]王国权,周锡元.921台湾集集地震近断层强震记录的基线校正[J].地震地质,2004,26(01):1-14.
[6]胡聿贤.地震工程学[M].北京:地震出版社,2006.
[2]施卫星,李正升,汪大绥.基础隔震位移反应谱及其应用[J].同济大学学报(自然科学版),2000,28(01):29-32.
[3]谢礼立,于双久.强震观测与分析原理[M].北京:地震出版社,1982.
[4]李大华,刘芳.力平衡加速度计强震记录仪器误差的校正[J].地震学报,1998,20(05):555-557.
[5]王国权,周锡元.921台湾集集地震近断层强震记录的基线校正[J].地震地质,2004,26(01):1-14.
[6]胡聿贤.地震工程学[M].北京:地震出版社,2006.
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