Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Conversion of Recorded Ground Motion to Virtual Ground Motion Compatible to Design Response Spectra

계측 기록의 설계스펙트럼 부합 가상 지진 변환 방법

  • Ji, Hae Yeon (Department of Civil Engineering, Pusan National University) ;
  • Choi, Da Seul (Department of Civil Engineering, Pusan National University) ;
  • Kim, Jung Han (Department of Civil Engineering, Pusan National University)
  • 지혜연 (부산대학교 토목공학과) ;
  • 최다슬 (부산대학교 토목공학과) ;
  • 김정한 (부산대학교 토목공학과)
  • Received : 2020.09.29
  • Accepted : 2020.12.07
  • Published : 2021.01.01
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Abstract

The design response spectrum presented in the seismic design standard reflects the characteristics of the tectonic environment at a site. However, since the design response spectrum does not represent the ground motion with a specific earthquake magnitude or distance, input ground motions for response history analysis need to be selected reasonably. It is appropriate to use observed ground motions recorded in Korea for the seismic design. However, recently recorded ground motions in the Gyeongju (2016) or Pohang (2017) earthquakes are not compatible with the design response spectrum. Therefore, it is necessary to convert the recorded ground motion in Korea to a model similar to the design response spectrum. In this study, several approaches to adjust the spectral acceleration level at each period range were tested. These are the intrinsic and scattering attenuation considering the earthquake environment, magnitude, distance change by the green function method, and a rupture propagation direction's directivity effect. Using these variables, the amplification ratio for the representative natural period was regressed. Finally, the optimum condition compatible with the design response spectrum was suggested, and the validation was performed by converting the recorded ground motion.

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References

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