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CFRP판으로 보강된 RC 보의 휨거동에 대한 유효깊이의 영향
우상균 ( Woo¸ Sang-kyun ),송영철 ( Song¸ Young-chul ),홍기남 ( Hong¸ Ki-nam ),한상훈 ( Han¸ Sang-hoon ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Experimental research was conducted to investigate the characteristics of various CFRP strengthening methods and effective depth of beam. A total of 12 specimens were tested in four point bending after strengthening them with externally bonded CFRP plates. The CFRP plates were bonded without prestress or with prestress levels of CFRP plate strain 0.6%. The non-prestressed specimen without anchor plate failed by separation of the plate from the beam due to premature debonding while the non-prestressed specimen with anchor plate failed by CFRP fracture and showed the significant increase of ductility capacity. In addition, the prestressed specimens failed by CFRP plate rupture. The maximum load and ductility capacity were most significantly increased. And it was founded the increasing ratio of ultimate load as to strengthening methods tends to decrease in case of the increase of effective depth of beam.
우상균 ( Woo Sang-kyun ),이홍표 ( Lee Hong-pyo ),송영철 ( Song Young-chul ),조명석 ( Cho Myung-seok ) 한국구조물진단유지관리공학회 2007 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.11 No.2
In this paper the characterization test for bond performance of CFRP plate was conducted, and based on its results, a new bond-slip model was proposed. The experiment results showed that as bond length and width of CFRP plate increased, its fracture load increased, but the increase also showed a tendency to reduce average bond stress due to the increase in bond surface. Also, as bond length and width increased, the strain of CFRP plate increased, but unlike bond length, increase in bond width was shown to reduce maximum bond stress. Among the test variables, as concrete strength increased in comparison to CFRP plate's bond length and width, fracture load and average bond stress showed tendency to increase, but the effect was revealed to be not significant. Also, as bond length increased, bond stress concentration was transmitted to the end parts of the CFRP plate, and as bond width increased, bond stress showed a tendency to uniformly spread along the bond surface. Based on the results of the bond experiment, a bilinear function was introduced to the ascending section and an exponential function was introduced to the descending section in correlating shear stress and slip in the bond-slip model, and a new bond-slip model was proposed that can effectively be applied to the analysis of boundary surface behavior between concrete and CFRP plates.
우상균(Woo, Sang-Kyun),조준형(Jo, Jun-Hyung),박성욱(Park, Sung-Wook),송영철(Song, Young-Chul) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
The construction of box culvert for power transmission are increasing more and more, and the life extension of it is very important. The development of DB system for structural life management of Box Culvert for power transmission is needed and widely discussed. Therefore, the DB system for structural life management for box culvert is developed. This system consists of four part, design data, maintenance data, investigation data using 3D optic scanner, and structural integrity evaluation data. This system makes progress in maintenance technology for box culvert and have various kind of advantages comparing with conventional method by visual inspection.
Blended 섬유를 사용한 양수 댐 표면 차수벽 콘크리트의 수축 특성
우상균 ( Woo Sang-kyun ),송영철 ( Song Young-chul ),원종필 ( Won Jong-pil ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The main purpose of this research was to enhance the durability in both the design and construction of dams. Especially, in case of rockfill dams, the durability of face slab concrete in a concrete-faced rockfill dam(CFRD) is achieved by optimizing the fly ash replacement for cement and application of blended fiber. The effect on durability and shrinkage property corresponding to the increasing replacement of fly ash and application of blended fiber was evaluated, and the optimum value of fly ash replacement and blended fiber application was recommended. The results show that 15% of fly ash replacement and 0.9kg/m<sup>3</sup> of blended fiber application was found to be an optimum level and demonstrated excellent performance in durability and shrinkage property.