BI-NORMALIZED RESPONSE SPECTRAL CHARACTERISTICS OF THE 1999 CHI-CHI EARTHQUAKE

Soil conditions and epicentral distance are two primary source parameters that influence ground motion during an earthquake. To develop uniform and seismic environment-dependent design spectrum, common acceleration response spectral characteristics need to be identified. This article reports on the development of a bi-normalized response spectrum (BNRS). The BNRS is defined as a spectrum of peak response acceleration normalized with respect to peak acceleration of the excitation plotted vs. the natural period of the system normalized with respect to the spectrum predominant period (Tp). The authors undertook a statistical analysis of records from the 1999 Chi-Chi earthquake, and examined the conventionally normalized response spectrum(NRS) and the BNRS to account for the effects of soil conditions, epicentral distance, hanging wall and damping. The results showed that, compared to the NRS, the BNRS is much less dependent on these factors. This feature makes the BNRS very meaningful to process the response spectra of all the records in a uniform manner (by not being dependent on these effects). The authors provide some simple relationships between the BNRS for a specified damping ratio and that for a damping ratio of 5%, and between the spectra predominant period and epicentral distance for different soil types. The authors conclude that site conditions have a minor effect on BNRS, and the effect of the epicentral distance is even less pronounced.

  • Availability:
  • Corporate Authors:

    Science Press

    Beijing 100707,   China 
  • Authors:
    • Longun, X
    • Lili, X
  • Publication Date: 2004-12

Language

  • English

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Filing Info

  • Accession Number: 00989049
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 2 2005 12:00AM