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NTIS 바로가기韓國地盤工學會論文集 = Journal of the Korean geotechnical society, v.32 no.6, 2016년, pp.49 - 59
만도카일 사이둘라 (한양대학교 대학원 건설환경공학과) , 박두희 (한양대학교 건설환경공학과) , 김한섭 (한양대학교 건설환경공학과) , 박기천 (한양대학교 대학원 건설환경공학과)
We develop liquefaction resistance curves, which represent the correlation between cyclic resistance ratio (CRR) and number of cycles (N) to estimate the build-up of residual excess pore pressure from simple shear tests performed for this study and also from published literature. The liquefaction cu...
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핵심어 | 질문 | 논문에서 추출한 답변 |
---|---|---|
반복저항응력이란? | 반복하중은 일반 적으로 유효상재하중(단순전단시험의 경우 유효수직응력, 삼축시험의 경우 유효평균응력)으로 정규화되며 이를 반복전단응력비(cyclic stress ratio, CSR)라 한다. 액상화를 유발하는 재하횟수 N에서의 CSR을 반복강도 (cyclic strength), 반복저항강도, 또는 반복저항응력비 (cyclic resistance ratio, CRR)라 한다. 다양한 CRR과 재하횟수 N 간의 관계를 곡선 형태로 나타낸 것을 반복저항곡선(Ishihara, 1996; Kramer, 1996), 액상화 저항 곡선 (Towhata, 2008), 또는 액상화 저항 응력비 곡선이라 한다. | |
MOF(1999)에서는 액상화에 대한 안전 율을 어떻게 산정하는가? | 액상화 저항 곡선은 실무에서 내진설계에 널리 사용 되고 있다. MOF(1999)에서는 진동삼축시험으로부터 도출된 액상화 저항 곡선을 이용하여 액상화에 대한 안전 율을 산정한다. 하지만 진동삼축시험의 응력장(stress field) 은 지진 시 실제 지반에 발생하는 응력장과 상이하여 진동삼축시험의 결과를 그대로 사용하는 것은 부적절하다고 알려져 있다(Kramer, 1996). | |
다양한 반복저항응력과 재하횟수 N 간의 관계를 곡선 형태로 나타낸 것을 뭐라 부르는가? | 액상화를 유발하는 재하횟수 N에서의 CSR을 반복강도 (cyclic strength), 반복저항강도, 또는 반복저항응력비 (cyclic resistance ratio, CRR)라 한다. 다양한 CRR과 재하횟수 N 간의 관계를 곡선 형태로 나타낸 것을 반복저항곡선(Ishihara, 1996; Kramer, 1996), 액상화 저항 곡선 (Towhata, 2008), 또는 액상화 저항 응력비 곡선이라 한다. |
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