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CFS로 휨 보강된 RC부재의 보강겹수에 따른 구조성능 변화
서수연(Seo Soo-Yeon),김경태(Kim Kyong-Tae),윤승조(Yoon Seung-Joe),윤현도(Yun Hyun-Do),최기봉(Choi Gi-Bong) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.2
Strengthening method using carbon fiber sheets have been developed for the rehabilitation of structures and applied to the concrete member. However, it is still questionable whether their structural capacity has been well kept without any deterioration as time goes. According to a few inspection results about RC buildings with retrofitted members by CFS, there have been found loss of strengthening using CFS because of the detachment of CFS from the concrete face, which causes the bond failure of CFS. The appearance of this loss may be initiated at just after retrofit construction. And it will be more serious when the layer number of CFS increases. In order to minimize above mistake in retrofit design using CFS, more exact evaluation process to predict the bond loss of CFS is required. The final objective of this research is to propose the guideline and method for estimating resistance capacity of strengthened structure as time goes by. In this paper, as a first step, previous equations to predict flexural strength of member retrofitted by CFS are analyzed and evaluated through a test work. And a nonlinear sectional analysis is performed using a commercial analysis program. In experimental work, specimens with the amounts of carbon fiber and strengthening method as test parameter are tested and their behavior is discussed. From the test, the flexural capacity was not linearly increased even if the layer number of CFS increased when it was more than two. The overall nonlinear behavior of RC member retrofitted with CFS could be suitably predicted by the analytical process in this paper by considering the bond loss.
화재손상된 철근콘크리트 깊은 보의 전단경간비에 따른 구조성능 변화
서수연(Seo Soo-Yeon),윤승조(Yoon Seung-Jo),김영만(Kim Yeong-Man),최기봉(Choi Ki-Bong) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.11
This paper presents experimental result of reinforced concrete deep beams with various shear span-to-depth ratios damaged by fire. Main parameters in the test were fire exposure duration and shear span-to-depth ratio. Nine RC deep beam specimens were made and six of those were exposed to fire by following standard fire loading curve. And then beam test was performed for those under simple support condition. Strength variation of materials by the exposure time and temperature of fire was evaluated through material test for concrete and reinforcements damaged by fire. In order to predict the specimen's structural capacity, analysis was performed using nonlinear sectional analysis and truss analogy. From the research, it was found that the strength of RC deep beam damaged by fire was more seriously affected by level of temperature than exposure time during fire loading. However, concrete tended to be dry as the exposure time increased so that the overall behavior of member changed to brittle failure mode. In order to suitably predict the strength of deep beam damaged by fire, the change of properties of concrete and reinforcements at each location should be well defined and appropriately reflected in analysis model.
서수연 ( Seo Soo-yeon ),조태섭 ( Cho Tae-seup ),윤승조 ( Yoon Seung-joe ),최기봉 ( Choi Ki-bong ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
This paper presents thermal analysis on the RC column under constant axial force simulating low part of medium height frame building. Material property of concrete and reinforcement for the thermal loading is reviewed from various papers. 2D nonlinear model for example column with 30mm of cover thickness is established in ADINA progam and several analyses are performed. Main parameters in the analysis are the variation of concrete strength and direction of thermal loading. 24MPa, 45MPa and 60MPa are prepared for concrete strength. Uniformally distributed loading and reversed triangle loading for both sides are considered. And analysis for the case of thermal loading only for one side is also dealt with. Analysis result showed that the required fire resisting time of the example column closer to 60 minute which is calculated from the axial deformation due to the thermal loading. The reinforcement reaches to the it's yield strength at 40 minute while concrete didn't arrive to it’s compressive strength until 110 minute.
서수연 ( Seo Soo-yeon ),윤승조 ( Yoon Seung-joe ),하기주 ( Ha Gi-joo ),윤용대 ( Yoon Yong-dae ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Recently, the construction demand for large underground space has been in creased so that the excavation technology for underground construction of building has been being developed. The construction of sheeting pile is for resisting the lateral pressure of soil during the excavation. In general, conventional sheeting H-pile is often used as a temporary member installed upon construction of outer retaining wall at basement floor. In CBW (Composite Basement Wall), R/C basement wall is combined with H-Pile and resists lateral soil pressure together. In this study, a total of five specimens with simple-ends were tested. Main parameters were the depth of basement wall and arrangement of shear connectors. The purpose of this experiment is to evaluate the flexural capacity to offer the raw-data of composite basement wall.
콘크리트 내에 매립된 헤드철근의 인장거동에 대한 유한요소해석
서수연 ( Seo Soo-yeon ),윤승조 ( Yoon Seung-joe ),하기주 ( Ha Gee-joo ),윤용대 ( Yoon Yong-dae ),권영근 ( Kwon Young-geun ),신금종 ( Shin Geum-jong ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
The objective of this paper is to verify the effect of embedded depth and width of head to the tensile capacity of head reinforcement embedded in concrete. FEM(Finite Element Method) analysis is conducted by using ADINA program (version 8.4) for the embedded reinforcement. Main variables in the analysis are embedded depth and width of head. Analysis result showed that the stiffness and strength depended on the embedded depth of head reinforcement. However, the increment of stiffness and strength were not high even if the width of head increased. On the other hand, flexural deformation occurred at the head when the width of head was increased.