Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Effect of Loading Frequency Dependent Soil Behavior on Seismic Site Effect

하중의 주파수에 의하여 지배받은 흙의 동적 거동이 부지증폭현상에 미치는 영향

  • Park Du-Hee (Dept. of Civil Engrg., Hanyang Univ.) ;
  • Hashash Y.M.A (Dept. of Civil & Environmental Engrg., Univ. of Illinois at Urbana-Champaign) ;
  • Lee Hyun-Woo (Graduate Student., Dept. of Civil Engrg., Hanyang Univ.) ;
  • Kim Jae-Yoen (Graduate Student., Dept. of Civil Engrg., Hanyang Univ.)
  • Published : 2006.03.01
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Abstract

Equivalent linear analysis is widely used in estimating local seismic site effects. The soil behavior in the analysis is often assumed to be rate-independent and is not influenced by the seismic loading frequency. Laboratory results, however, indicate that cohesive soil behavior is greatly influenced by the loading frequency. A new equivalent linear analysis method that accounts for the loading frequency dependent soil behavior is developed and used to perform a series of one dimensional site response analyses. Results indicate that while frequency dependent shear modulus has limited influence on computed site response, frequency dependent soil damping greatly filters out high frequency components of the ground motion and thus results in lower response.

등가선형해석은 지반증폭현상을 모사하기 위하여 널리 사용되고 있으며, 해석 시 흙의 거동은 하중의 주파수의 영향을 받지 않는다고 가정되어왔다. 반면, 실내시험은 점성토의 경우 하중의 주파수의 영향을 크게 받는다는 것을 보여주고 있다. 본 연구에서는 하중의 주파수가 흙의 동적 거동에 미치는 영향을 고려하는 새로운 등가선형해석기법이 개발되었으며 주파수의 영향을 규명하기 위하여 지반응답해석을 수행하였다. 해석 결과, 하중의 주파수에 따라서 변화하는 전단탄성계수가 지반응답에 미치는 영향은 작은 반면 감쇠비는 큰 영향을 끼치는 것으로 판명되었다. 이는 하중의 주파수가 높아질수록 흙의 감쇠비도 같이 증가하며 이로 인하여 지진파의 고주파수 요소가 필터링 되기 때문이다. 따라서, 하중의 주파수에 지배 받는 흙의 거동은 특히 고주파수 요소가 풍부한 지진파 전파 모사 시 특히 중요하다고 판단된다.

Keywords

References

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