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탄소섬유메쉬와 모르터로 전단 보강된 RC보의 거동에 관한 연구
서수연 ( Seo Soo-yeon ),윤승조 ( Yoon Seung-joe ),이우진 ( Lee Woo-jin ),이종규 ( Lee Jong-kyu ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 논문집 Vol.8 No.2
본 연구의 목적은 CFM으로 전단 보강된 보의 실험으로 CFM의 전단 보강 효과를 평가하는 것으로서, 실험 변수는 메쉬의 배치 방향, 정착 클립의 개수, 전단 스팬비이다. 실험에서, 전체적으로 모르터와 RC보에서의 부착 파괴는 가력 초기부터 발생하여 최대 내력의 약 60% 정도에서 완전히 파괴되었으며, 전단 내력에 대한 CFM의 기여도는 CFM 최대 인장 강도의 약 19.6%인 것으로 나타났다. 또한 전단 스팬비가 1.0인 경우 대각선 방향으로 메쉬를 배치할 때 전단 보강 효과가 높은 것으로 나타났으나, 1.5인 시험체의 경우, 정착 클립의 개수가 많을 경우 보강 효과가 높은 것으로 나타났다. The purpose of this study is to investigate shear strengthening effects and behaviour of RC beams strengthened in shear by Carbon Fiber Mesh(CFM) and mortar for fixing CFM to concrete. Test parameters in experiment are shear span-to-depth ratio, layout of CFM and number of clip. From the test, it was shown that the governing failure patten was the bond failure between cover mortar and RC beam initiated at about 60% of maximum strength. And the strength of CFM was developed up to 19.6% of it's maximum tensile strength when the specimen reached to failure. The most effective enhancement using CFM and mortar were to attach CFM diagonally to concrete in a/d of 1.0 and increase the number of cilps in a/d of 1.5, respectively.
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.
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.
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 ),김경태 ( Kim Kyong-tae ),윤승조 ( Yoon Seung-joe ),윤현도 ( Yun Hyun-do ),최창식 ( Choi Chang-sik ),최기봉 ( Choi Gi-bong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Strengthening method using carbon fiber sheets and boards have been developed for the rehabilitation of structures. However, it is very difficult to estimate their resistance capacity as time goes by. Therefore, damage information for strengthened structures with carbon fiber sheets and boards are investigated and the estimation method of their resistance capacity by using the damage information is developed. 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, specimens with strengthening method of carbon fiber sheet and boards as test parameter are tested and their behavior is discussed.
화재 피해를 입은 철근콘크리트 보의 전단거동에 관한 실험적 연구
서수연 ( Seo Soo-yeon ),윤숭조 ( Yoon Seung-joe ),김영만 ( Kim Young-man ),최기봉 ( Choi Ki-bong ),정채명 ( Jung Chae-myuong ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This paper presents experimental result about the shear behavior of RC beam damaged by fire mine parameters in the test are the exposed time to fire and shear span-to-depth ratio. Test result shows that the temperature of fire is mare effective to the strength of specimens then the exposed time. In case of experiencing same exposed time to fire, the variation of shear strength of specimens with different shear span-to-depth ratios in similar to those without fire damage.
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 ),윤승조 ( Yoon Seung-joe ),윤현도 ( Yun Hyun-do ),최창식 ( Choi Chang-sik ),최기봉 ( Choi Ki-bong ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
A study is performed to analyze the status and research trend of retrofit method used in building structures at Korea. 152 Reinforced Concrete buildings with retrofitted members of 7238 in domestic after 1999 are gathered and reviewed. In addition, literature review about 191 research papers for retrofit of RC structure is performed. Results show that most widely applied retrofit method and target member are wire tension method and flexural member such as beam and slab, respectively. Recently, the use of Carbon Fiber Sheet(CFS) is increasing and many research results concerning it are provided. Therefore, it is recommended to develop an effective method to estimate the structural capacity of retrofitted member with CFS.
일사량을 고려한 상부슬래브의 온도하중에 대한 거동 특성
서수연(Seo Soo-Yeon),조용만(Cho Yong-Man),김경태(Kim Kyong-Tae),윤승조(Yoon Seung-Joe),윤현도(Yun Hyun-Do),최기봉(Choi Gi-Bong) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
The purpose of this study is to perform an experiment to determine how much the temperature stress that works on roof slab due to differences in temperature on the surface of structure, may have effects on the long-term behaviors of structure, and thereby provide a useful reference material for measuring the serviceability of architectural structures. Based on actual survey data from Korea Meteorological Administration (KMA), the experiment is planned by calculating differences in the surface temperature of the structure in terms of insolation, as well as getting differences in temperature distribution of the upper slab structure. Next, the results are converted into cyclic temperature stress. The stress is applied to structures, depending on each experimental variable. Test result showed that the stiffness at nonlinear region after the experiment temperature stress of 20years.