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보수/보강된 구조물의 건전도 평가기술 - CFS로 휨보강된 철근콘크리트 보의 보강성능 및 음향방출 특성 평가 : 보수/보강된 구조물의 건전도 평가기술
최기봉(Choi Gi-Bong),최창식(Choi Chang-Sik),서수연(Seo Soo-Yeon),윤현도(Yun Hyun-Do) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
As time goes up, structural capacity of members decreases in R/C structures. The deterioration of the capacity is mainly due to the corrosion of materials, environmental pollution, etc. Thus it is necessary to develop the method for repair and retrofit of structures in order to ensure structural safety of members. Recently, a method using Carbon Fiber Sheet (CFS) has been widely recognized as good one for strengthening members. Several flexural tests for beam strengthened with CFS show that CFS of the beam is ripped by tension or separated from the concrete face at failure. The ultimate strength of the beam, also, depends on those failure patterns. The flexible capacity of RC members retrofitted with CFS depends on bond capacity between concrete and CFS. Experimental and analytical works are performed to develop an integrity Evaluation of repaired/strengthened RC structure. From a test, damage information for strengthened structure with CFS investigated and the estimation method structural capacity by using the damage information is developed. And an analysis is carried out to predict nonlinear behavior of RC member retrofitted by CFS and analysis result is compared with test result to verify the usefulness of it.
보수/보강된 구조물의 건전도 평가기술(CFS로 휨보강된 철근콘크리트 보의 보강성능 및 음향방출 특성 평가)
최기봉 ( Choi Gi-bong ),최창식 ( Choi Chang-sik ),서수연 ( Seo Soo-yeon ),윤현도 ( Yun Hyun-do ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
As time goes up, structural capacity of members decreases in R/C structures. The deterioration of the capacity is mainly due to the corrosion of materials, environmental pollution, etc. Thus it is necessary to develop the method for repair and retrofit of structures in order to ensure structural safety of members. Recently, a method using Carbon Fiber Sheet (CFS) has been widely recognized as good one for strengthening members. Several flexural tests for beam strengthened with CFS show that CFS of the beam is ripped by tension or separated from the concrete face at failure. The ultimate strength of the beam, also, depends on those failure patterns. The flexible capacity of RC members retrofitted with CFS depends on bond capacity between concrete and CFS. Experimental and analytical works are performed to develop an integrity Evaluation of repaired/strengthened RC structure. From a test, damage information for strengthened structure with CFS investigated and the estimation method structural capacity by using the damage information is developed. And an analysis is carried out to predict nonlinear behavior of RC member retrofitted by CFS and analysis result is compared with test result to verify the usefulness of it.
모래로 축조(築造)한 제체(堤體)의 사면안정(斜面安定) 해석(解析)
신방웅,최기봉,Shin, Bang Woong,Choi, Gi Bong 대한토목학회 1985 대한토목학회논문집 Vol.5 No.4
본(本) 연구(硏究)는 제체(堤體)에 있어서, 수위(水位)가 급상승(急上昇)함에 따라 제체내부(堤體內部)의 공극수압(空隙水壓)이 변화(變化)하는 제체경사면(堤體傾斜面)의 파괴현상(破壞現象)을 연구(硏究)한 것이다. 그리고 이미 발표(發表)된 근사이론식(近似理論式)을 토대로 국부(局部) 파괴현상(破壞現象)을 실험(實驗)을 통(通)하여 고찰(考察)했다. 본(本) 실험(實驗)에서 연구(硏究)된 내용(內容)은 다음과 같다. 1) 침윤선(浸潤線)에 따른 유출점(流出點)의 위치 결정(決定) 2) 유출점(流出點) 부근(部近)에서 발생(發生)되는 국부(局部) 파괴현상(破壞現象)에 대한 고찰(考察) 3) 침투수압(浸透水壓)이 제체(堤體)에 미치는 영향(影響) The author has studied the collapse of a slope with seepage occuring in sand model with a trapezodial cross section. The primary objective of this study was to examine the failure phenomenon of embankment with respect to change in void pressure at embankment slope. The contents of this experiments are as follows; 1) Determination of exit point by seepage line. 2) Evaluation of partial failure at exit point. 3) The effects of seepage force at embankment.
개구부 설치에 따른 철근콘크리트 전단벽의 강도에 관한 해석적 연구
한민기(Han Min-Ki),김선우(Kim Sun-Woo),김효진(Kim Hyo-Jin),윤현도(Yun Hyun-Do),최창식(Choi Chang-Sik),최기봉(Choi Gi-Bong) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
This paper discusses that the reduction of wall strength and stiffness has been investigated by a nonlinear finite element analysis (FEA) using ABAQUS that reinforced concrete shear wall artificially-introduced opening for remodeling. The FEA models account for the effects of material inelasticity, concrete cracking, geometric nonlinearity and bond-slip of steel and concrete. In order to verify the proposed FEA model, a parametric study has been carried out using parameters that the vertical and horizontal percentage and position of reinforced concrete shear wall opening. The analytical results were validated through comparisons with the experimental results and the theory that ACl 318-05 and AU. The analysis showed good agreement between the experimental results and the theory.