Analysis of Characteristics of Vertical Response Spectrum of Ground Motions from Domestic Earthquakes

국내 관측자료를 이용한 수직 응답스펙트럼 특성 분석

  • Kim, Jun-Kyoung (Department of Fire & Disaster Prevention, Semyung University) ;
  • Hong, Seung-Min (Department of Fire & Disaster Prevention, Semyung University) ;
  • Park, Ki-Jong (Department of Fire & Disaster Prevention, Semyung University)
  • 김준경 (세명대학교 소방방재학과) ;
  • 홍승민 (세명대학교 소방방재학과) ;
  • 박기종 (세명대학교 소방방재학과)
  • Received : 2010.08.02
  • Accepted : 2010.08.25
  • Published : 2010.08.31

Abstract

The vertical response spectra using the observed ground motions from the recent more than 30 macro earthquakes were analysed and then were compared both to the seismic design response spectra (Reg Guide 1.60), applied to the domestic nuclear power plants, and to the Korean Standard Design Response Spectrum for general structures and buildings (1997). 176 vertical ground motions, without considering soil types, were used for normalization with respect to the peak acceleration value of each ground motion. The results showed that response spectrum had strong dependency on epicentral distance. The results also showed that the vertical response spectra revealed much higher values for frequency bands above 5~7 Hz than Reg. Guide (1.60). The results were also compared to the Korean Standard Response Spectrum for the 3 different soil types and showed that the vertical response spectra revealed much higher values for the frequency bands below 0.2 second (5 Hz) than the Korean Standard Response Spectrum (SD soil condition). These frequency-dependent spectral values could be related to the characteristics of the domestic crustal attenuation and the effect of each site amplification. However, through the qualitative improvements and quantitative enhancement of the observed ground motions, the conservation of vertical seismic design response spectrum should be considered more significantly for the frequency bands above 5 Hz.

Acknowledgement

Supported by : 기상지진개발사업단

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