相互作用分析中地震动输入长周期校正研究
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摘要
由于长周期误差信号的影响,仅通过直流分量滤波处理地震加速度记录,积分获得的地震波位移时程曲线仍存在很严重的零线飘移现象.通过利用最小二乘法构建原始加速度均值的二次多项式拟合曲线,提出了简便的加速度记录长周期误差时域校正法,在几乎不改变地震加速度频谱主要性质的前提下,很好地改善了加速度记录的积分性质.具体的工程应用验证了其有效性,并显示在大跨度结构-地基动力相互作用时域分析中,地震波输入位移时程对结构总体响应有着明显影响.
Due to long-period errors, the baseline offsets of the integrated displacement data, by the double integral of acceleration history, are still very large, though the baseline of the seismic accelerogram has already been corrected. New simple time-domain measures for long-period correction of seismograms are presented based on the least-square curve fitting method, which can effectively improve the integral property of acceleration data with little change in the content of the spectrum characteristics and engineering dynamic properties for dynamic interaction analysis. Practical applications reveal its efficiency and show that seismic wave input mechanism has great effects on the total response analysis of large-scale structure-foundation dynamic interaction system subjected to multi-input or traveling seismic excitations.
Due to long-period errors, the baseline offsets of the integrated displacement data, by the double integral of acceleration history, are still very large, though the baseline of the seismic accelerogram has already been corrected. New simple time-domain measures for long-period correction of seismograms are presented based on the least-square curve fitting method, which can effectively improve the integral property of acceleration data with little change in the content of the spectrum characteristics and engineering dynamic properties for dynamic interaction analysis. Practical applications reveal its efficiency and show that seismic wave input mechanism has great effects on the total response analysis of large-scale structure-foundation dynamic interaction system subjected to multi-input or traveling seismic excitations.
引文
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[4]谢礼立.中国强震记录汇报[R].北京:地震出版社,1993.
[5]陈厚群.中国水工结构重要强震数据及分析[M].北京:地震出版社,2000.
[6]陈健云,李静,周晶.高拱坝的时频非平稳随机地震响应分析[J].工程力学,2002(增刊 ):418-422.
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