Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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A Study on the Damping Correction Factors for the Korean Standard Design Spectrum

한국 표준설계스펙트럼의 감쇠보정계수에 대한 연구

  • Heo, Tae Min (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Kim, Jung Han (School of Urban, Architecture and Civil Engineering, Pusan National University) ;
  • Lee, Jin Ho (Department of Ocean Engineering, Pukyong National University) ;
  • Kim, Jae Kwan (Department of Civil and Environmental Engineering, Seoul National University)
  • 허태민 (서울대학교 건설환경공학부) ;
  • 김정한 (부산대학교 건설융합학부) ;
  • 이진호 (부경대학교 해양공학과) ;
  • 김재관 (서울대학교 건설환경공학부)
  • Received : 2017.10.25
  • Accepted : 2017.12.08
  • Published : 2018.01.01
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Abstract

In this study, we develop and propose damping correction factors for the Korean standard design spectra. The newly proposed Korean standard design spectra has been given only for 5% damping ratio. But in practice, engineers need design spectra for damping values other than 5%. To obtain design spectra for various damping values from the standard spectra, damping correction factors are derived. These factors modify the shape of design spectra in accordance with the damping ratio. Response spectra for various damping values are calculated from the earthquake records that had been used to calculate standard design spectra. They consist of 55 records from 18 earthquakes occurred in overseas intraplate regions and Korea. The regressed spectra for the damping values ranging from 0.5% to 50 % are compared with standard spectra at three regions acceleration, velocity and displacement sensitive regions. The regression analysis of these data rendered formula for damping correction factors. Finally, a single formula for damping correction factors is recommended that is valid for both horizontal and vertical design spectra and that is applicable to the entire range of periods. One thing to note that recommended damping correction factors is valid for the design spectrum of the rock grounds because the design spectra was developed based on the earthquake records of the rock ground.

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References

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  1. Amplification Characteristics of Domestic and Overseas Intraplate Earthquake Ground Motions in Korean Soil and Standard Horizontal Design Spectrum for Soil Sites vol.22, pp.7, 2018, https://doi.org/10.5000/EESK.2018.22.7.391