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2017 Vol.33, Issue 12 Preview Page
Case Study on Influential Factors of Nonlinear Response History Analysis - Focused on 1989 Loma Prieta Earthquake -

비선형 응답이력해석의 영향인자에 대한 사례연구 - 1989 Loma Prieta 지진 계측기록을 중심으로 -

Qihang Liu1
,
Jin-Sun Lee2*
유 계항1
,
이 진선2*
1MS. Student, Dept. of Civil and Environmental Eng., Wonkwang Univ.
2Associate Prof., Dept. of Civil and Environmental Eng., Wonkwang Univ.
1원광대학교 토목환경공학과 석사과정
2원광대학교 토목환경공학과 부교수
*교신저자. *Corresponding Author. 
31 December 2017. pp. 45-58
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Abstract

As many seismic codes for various facilities are changed into a performance based design code, demand for a reliable nonlinear response-history analysis (RHA) arises. However, the equivalent linear analysis has been used as a standard approach since 1970 in the field of site response analysis. So, the reliability of nonlinear RHA should be provided to be adopted in replace of equivalent linear analysis. In this paper, the reliability of nonlinear RHA is reviewed for a layered soil layer using Loma Prieta earthquake records in 1989. For this purpose, the appropriate way for selecting nonlinear soil models and the effect of base boundary condition for 3D analysis are evaluated. As a result, there is no significant differences between equivalent linear and nonlinear RHA. In case of 3D analysis, absorbing boundary condition should be applied at base to prevent rocking motion of the whole model.

Keywords
Site response analysis
Site amplification
Equivalent linear analysis
Response history analysis
Performance-based design
Nonlinear analysis

최근 들어 시설물별 내진설계기준이 성능기반 내진설계로 전환됨에 따라, 신뢰성있는 비선형 응답이력해석(Response- history analysis, RHA)에 대한 요구가 높아지고 있다. 그러나, 부지응답해석 분야에 있어서는 1970년대 이후 등가선형해석이 표준절차로 자리잡고 있음에 따라, 이를 대체하기 위해서는 비선형 응답이력해석의 신뢰성이 확보되어야 한다. 본 논문에서는 1989년 미국 Loma Prieta 지진기록을 바탕으로 다층지반에 대해서 비선형 RHA를 이용한 부지응답해석결과의 신뢰성을 검증하였다. 이를 위하여, 비선형 RHA를 위한 비선형 지반모델의 선정방법과 3차원 해석시 요구되는 기반암 경계조건의 영향을 평가 하였다. 평가 결과, 제한된 조건하에서 가장 정확한 비선형 지반모델과 경계조건을 적용 시 비선형 RHA의 결과는 등가선형 해석결과와 유의미한 차이는 발생하지 않음을 알 수 있었다. 또한, 3차원 해석을 시행하는 경우, 전체 모델의 회전운동을 제어하기 위하여 최 하단부 흡수 경계조건을 적용해야 함을 알 수 있었다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 33
  • No :12
  • Pages :45-58
  • Received Date : 2017-10-10
  • Revised Date : 2017-11-02
  • Accepted Date : 2017-11-09
  • DOI :https://doi.org/10.7843/kgs.2017.33.12.45
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