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장연수,Jang, Yeon Soo Korean Society of Civil Engeneers 1992 대한토목학회논문집 Vol.12 No.2
본 논문에서는 일계(一階) 및 이계(二階) 신뢰해석법(信賴解析法)을 이용 흙속으로의 오염물 이동을 해석할 수 있는 모델을 개발하였으며 오염이동 모델은 1차원 차분법과 2차원 유한요소법을 이용하였다. 일계(一階) 및 이계(二階) 신뢰성 해석법은 흙의 특성을 제한하는 가정사항이 필요치 않은 확률모델이며 본 해석으로부터 얻어지는 예민도(sensitivity)는 확률해에 큰 영향을 미치는 입력 매개변수에 대한 정보를 제공한다. 1차원 오염물 이동 신뢰성 해석으로 신뢰성해석 프로그램의 유용성과 정밀성을 검증하였으며, 연속 오염원의 2차원 해석과 농도 극한상태 함수를 이용하여 오염물 이동 경로상 지점의 입력변수가 신뢰성해석의 확률해(解)에 미치는 영향을 검토하였다. The first and second-order reliability method(FORM and SORM) is presented using one dimensional finite difference and two dimensional finite element transport models. FORM and SORM can be used without any restrictive assumptions about the properties of the media, and the sensitivity information obtained as part of these analyses is used to identify the parameters which have major influence on the estimate of probability. The reliability analysis of transport in a one-dimensional domain is used to test the robustness of the reliability code and to evaluate the accuracy of the reliability method. A continuous source 2-D example with a concentration threshold limit state function is used to evaluate the influence of the parameters in the location of interest on the reliability solution.
장연수(Yeon-Soo Jang),박준모(Joon-Mo Park) 한국지반신소재학회 2013 한국토목섬유학회 학술발표회 Vol.2013 No.4
The necessity of developing the load and resistance factor design(LRFD) for soft ground improvement method has been raised recently, since the limit state design is requested as international technical standard for the foundation of structures. In this study, LRFD method is suggested for the foundation on the single aggregate pier improved cohesive soils. The database of the static load tests on the aggregate pier ares made by collecting the data from domestic and international and total 65 data is collected. The quality assessment method for the database have been proposed to obtained reliability resistance bias factor. The resistance bias factors are calculated from the statistical analysis of the static load test database. Target reliability index of the aggregate pier improved cohesive soils was suggested and validated by comparing with the target reliability level of other structural foundations. Resistance factors were calibrated based on the reliability theory was compared also with those obtained by fitting to safety factors in ASD for the bulging failure of aggregate pier improve cohesive soils.