Quantitative Evaluation of Near-Fault Records Generated via Wavelet Transform

Document Type : Seismology and Engineering Seismology

Authors

University of Mohaghegh Ardabili

Abstract

Nonlinear time-history analysis is becoming more common in seismic analysis and design of structures. The key issue in performing this kind of analysis is the appropriate input ground motion. Many engineers select recorded motions from locations other than the project site and modify them by scaling or spectrum matching. A wavelet-based procedure has been used to generate ground motions that are design spectrum compatible. Near-fault ground motions containing strong velocity pulses are of interest in the fields of seismology and earthquake engineering. Sites located in the vicinity of seismic faults may experience ground motions with the effect of forward directivity, causing most of the seismic energy in a single pulse registered early in the velocity history. Baker introduced a quantitative way to distinguish and classify this kind of records. The principle purpose of this article is to survey generating spectrum-compatible time-histories for near-fault via wavelet transform by Baker’s method.

Keywords


  1. Ebrahimian, B. and Graves, R. (2008) Simulation of near field strong ground motions at Tombak site in Iran using hybrid method. The 14th World Conference on Earthquake Engineering, October 12-17, 2008, Beijing, China.
  2. Tsai, N.C. (1972) Spectrum-Compatible Motions for Design Purposes. J. Eng. Mech. Div., ASCE, 98, 345-356.
  3. Lilhanand, K. and Tseng, W.S. (1988) Development and application of realistic earthquake time histories compatible with multiple damping design spectra. Proceedings of the 9th WCEE, 2, Tokyo-Kyoto, Japan, 819-824.
  4. Hancock, J., Watson-Lamprey, J., Abrahamson, N.A., Bommer, J.J., Markatis, A., McCoy, E., and Mendis, R. (2006) An improved method of matching response spectra of recorded earthquake ground motion using wavelets. J. Earthq. Eng., 10 (Special Issue 1), 67-89.
  5. Mukherjee, S. and Gupta, V.K. (2002) Wavelet-Based generation of spectrum compatible time-histories. Soil Dyn. Earthq. Eng., 22(9-12), 799-804.
  6. Gaupillaud, P., Grossmann, A., and Morlet, J. (1984) Cycle-octave and related transforms in seismic signal analysis. Geoexploration, 23, 85-102.
  7. Newland, D.E. (1993) An Introduction to Random Vibrations, Spectral and Wavelet Analysis. UK: Longman.
  8. Gurley, K. and Kareem, A. (1999) Applications of wavelet transforms in earthquake wind and ocean engineering. Engineering Structures, 21, 149-167.
  9. Krawinkler, H., Alavi, B., and Zareian, F. (2005) 'Impact of Near-Fault Pulses on Engineering Design.' In: Directions in Strong Motion Instrumentation, Springer Netherlands, 83-106.
  10. Somerville, P.G. (2002) Characterizing near fault ground motion for the design and evaluation of bridges. Proceedings of the Third National Seismic Conference and Workshop on Bridges and Highways.
  11. Bray, J.D. and Rodriguez-Marek, A. (2004) Characterization of forward-directivity ground motions in the near-fault region. Soil Dynamics and Earthquake Engineering, 24(11), 815–828.
  12. Baker, J. (2007) Quantitative classification of near-field ground motion using wavelet analysis. Bulletin of the Seismological Society of America, 97(5), 1486–1501.
  13. Iyama, J. and Kuwamura, H. (1999) Application of wavelet to analysis and simulation of earthquake motions. Earthquake Engineering and Structure Dynamics, 28(3), 255-272.
  14. Refooei, F.R., Mobarake, A., and Ahmadi, G. (2001) Generation of Artificial Earthquake Records with a Nonstationary Kanai-Tajimi Model. Engineering Structures, 23(7), 827–37.
  15. Ghodrati Amiri, G., Ashtrai, P., and Rahami, H. (2006) New development of artificial record generation by wavelet theory. Structural Engineering and Mechanics, 22(2), 185-195.
  16. Suarez, L.E. and Montejo, L.A. (2005) Generation of artificial earthquakes via the wavelet transform. Int. J. Solids Struct., 42, 5905–5919.
  17. Building and Housing Research Center of Iran (2012) Iranian Code of Practice for Seismic Resistant Design of Buildings, Standard No. 2800. 4th Ed.
  18. PEER Strong Motion Database: http://peer.berkeley.edu/nga.