Rotational components of ground motion based on wavelet analysis

被引：0
|
作者：
Hubei Key Lab. of Road Bridge and Structure Engineering, Wuhan University of Technology, Wuhan [1 ]
430070, China
机构：
[1] Hubei Key Lab. of Road Bridge and Structure Engineering, Wuhan University of Technology, Wuhan
来源：
Yantu Gongcheng Xuebao | / 7卷 / 1241-1248期
关键词：
Fourier analysis; Ground motion; Residual tilt; Rotational component; Shaking table test; Threshold processing; Wavelet analysis;
D O I：
10.11779/CJGE201507010
中图分类号：
学科分类号：
摘要：
The rotational components of strong ground motion near faults have differences in the response to the horizontal and vertical pendulums of seismograph, and according to this principle, a method for obtaining the rotational components of ground motion is established using the wavelet analysis. The local time-frequency characteristics of uncorrected horizontal and vertical earthquake accelerograms using the discrete wavelet transform are discussed. Then a new threshold method, which processes the wavelet coefficients for horizontal earthquake accelerograms, is established to obtain the rotational components of ground motion. Finally, the correctness and precision of the method for obtaining the rotational components using the wavelet analysis is verified through shaking table tests. The results show that the calculated residual tilt displacement of rotational components of ground motion is consistent with the actual one. And the low-frequency part of the horizontal Fourier spectra of ground motion with the rotational component being filtered out is similar to the vertical ones. The correctness of the proposed method is verified through shaking table tests. Compared with the results processed by the Fourier analysis, the wavelet analysis can achieve more accurate results, and it is consistent with the actual situation. ©, 2015, Chinese Society of Civil Engineering. All right reserved.
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页码：1241 / 1248
页数：7
相关论文
共 13 条
  • [1] Graizer V.M., Kalkan E., Prediction of spectral acceleration response ordinates based on PGA attenuation, Earthquake Spectra, 25, 1, pp. 39-69, (2009)
  • [2] Graizer V.M., Tilts in strong ground motion, Bulletin of the Seismological Society of American, 96, pp. 2090-2102, (2006)
  • [3] Che W., Luo Q.-F., Time-frequency response spectrum of rotational ground motion and its application, Earthquake Science, 23, 1, pp. 71-77, (2010)
  • [4] Lee V.W., Trifunac M.D., Torsional accelerograms, Soil Dynamics and Earthquake Engineering, 4, pp. 132-142, (1985)
  • [5] Li H.-N., Sun L.-Y., Wang S.-Y., Improved approach for obtaining rotational components of seismic motion, Nuclear Engineering and Design, 232, 2, pp. 131-137, (2004)
  • [6] Graizer V.M., Effect of tilt on strong motion data processing, Soil Dynamics and Earthquake Engineering, 25, pp. 197-204, (2005)
  • [7] Trifunac M.D., Todorovska M.I., Duration of strong motion during Northridge, California, earthquake of January 17,1994, Soil Dynamics and Earthquake Engineering, 38, pp. 119-127, (2012)
  • [8] Dongelo D., Simeone V., Geomorphometric analysis based on discrete wavelet transform, Environmental Earth Science, 71, 7, pp. 3095-3108, (2014)
  • [9] Naga P., Eatherton M.R., Analyzing the effect of moving response on seismic response of structures using wavelet transform, Earthquake Engineering & Structural Dynamics, 43, 5, pp. 759-768, (2014)
  • [10] Ansari A., Noorzad A., Zafarani H., Et al., Correction of highly noisy strong motion records using a modified wavelet de-nosing method, Soil Dynamics and Earthquake Engineering, 30, 11, pp. 1168-1181, (2011)
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