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간편법을 이용한 액상화 평가 기준에 대한 고찰 KCI 등재
Overview on Standards for Liquefaction Triggering Evaluation using the Simplified Method
- 언어KOR
- URLhttps://db.koreascholar.com/Article/Detail/398209
Evidence of liquefaction during the 2017 Pohang earthquake has highlighted the urgent need to evaluate the current seismic design standard for liquefaction in Korea, particularly the liquefaction triggering standard. With the simplified method, which is the most popular method for evaluating liquefaction triggering, the factor of safety for liquefaction triggering is calculated via the cyclic stress ratio (CSR) and the cyclic resistance ratio (CRR). The parameters in the CSR and CRR have undergone changes over time based on new research findings and lessons learned from liquefaction case-histories. Hence, the current design standard for liquefaction triggering evaluation in Korea should also reflect these changes to achieve seismic safety during future earthquakes. In this study, liquefaction susceptibility criteria were discussed initially and this was followed by a review of the current liquefaction triggering codes/guidelines in other countries and Korea. Next, the parameters associated with the CSR such as the maximum ground acceleration, stress reduction factor, magnitude scaling factor, and overburden correction factor were discussed in detail. Then, the evaluation of the CRR using the SPT N-value and CPT qc-value was elaborated along with overburden and clean-sand correction factors. Based on this review of liquefaction triggering evaluation standards, recommendations are made for improving the current seismic design standard related to liquefaction triggering in Korea.
1. 서 론
2. 국내외 액상화 평가 기준
2.1 액상화 평가 과정
2.2 국내외 설계기준 및 지침서
3. 진동전단응력비(CSR)에 대한 고찰
3.1 응력감소계수(Stress reduction factor, rd)
3.2 규모보정계수(Magnitude scaling factor, MSF)
3.3 수직응력보정계수(Overburden correction factor)
4. 진동전단저항비(CRR)에 대한 고찰
4.1 등가 순모래 보정(Clean sand correction)
4.2 SPT 기반 액상화 평가
4.3 CPT 기반 액상화 평가
5. 결 론
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