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섬유시트로 보강된 철근콘크리트 기둥의 압축강도 특성에 관한 실험적 연구
김정섭,최진석,조철희,고송균,Kim, Jeong-Sup,Choi, Jin-Seok,Cho, Cheol-Hee,Go, Song-Kyoon 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.2
Test specimen test was performed using concrete reinforced with fiber sheet and the test variables were based on the kinds of fiber and the number of reinforcement layers. Using steel-concrete reinforced with fiber sheet, compression tests were performed and the test variables were the kinds of fiber, number reinforcement layers and reinforcement layer order. The following results were obtained: 1) It was demonstrated that compressive strength of the test specimen reinforced during test specimen test and member test increased as the number of reinforcement layers increased. 2) It was shown that non-reinforced test, specimen were destroyed during the member tests, but the specimen reinforced with CFS destroyed and the GFS-reinforced specimen and composite reinforced specimen showed ductile destruction. 3) As a result of tests on kinds of reinforcement fiber, it was demonstrated that CFS-reinforced test specimen had higher compressive strength in a 공시체 test. In the member test, 2ply-and 3ply-GFS reinforced specimens except lplied one had higher compressive strength. It was because partial destruction occurred due to the rate of height/section. 4) For layer strength order, compared with test specimen reinforced only with a single reinforced material, test specimen reinforced with CFS and GFS, and test specimen reinforced with CFS first showed better results in compressive strength and ductility judgement.
전단보강근이 없는 섬유보강 철근콘크리트 보의 특성에 관한 실험적 연구
김정섭,고송균,최진석,Kim, Jeong-Sup,Go, Song-Kyoon,Choi, Jin-Seok 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
This study examines the material characteristics of fibers and their influences on reinforced concrete through the tests of reinforced concrete by the types of fibers including non-reinforced, steel, polypropylene and cellulose fibers and the test of compressive strength and reinforced concrete beam without shear reinforcement and consequently it obtains the following conclusions. As a result of conducting compressive strength by the types of specimens, fiber reinforced specimen with the highest compressive strength value at 28 days of age was cellulose fiber reinforced specimen as 280.4kgf/$\textrm{cm}^2$ and steel fiber specimen had the highest compressive strength of 250.7kgf/$\textrm{cm}^2$ at 180 days of age. In case of non-reinforced specimen, its compressive strength was 277.4kgf/$\textrm{cm}^2$ at 28 days of age and 273.1kgf/$\textrm{cm}^2$ at 180 days of age. Comparing the compressive strength of non-reinforced specimen to that fiber reinforced specimen showed that the compressive strength of fiber reinforced specimen was lower in the passage of age and the results of this experiment showed no effects of fiber reinforcement. As a result of testing reinforced concrete beam without shear reinforcement, ductility factors of specimens were 4.67 for non-reinforced specimen, 8.18 for steel fiber reinforced specimen, 6.20 for polypropylene fiber reinforced specimen and 5.49 for cellulose reinforced specimen, and it is found that steel fiber reinforced specimen was highest. When non-reinforced specimen and steel fiber reinforced specimen were compared, steel fiber reinforced specimen had higher ductility factor of about 75.2% than that of non-reinforced specimen.
섬유보강 철근콘크리트 보의 강도특성에 관한 실험적 연구
김정섭,박영배,Kim, Jeong-Sup,Park, Young-Bae 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.1
This study aims to provide basic data that can be applied to construct real structures. For this, an experimental structure was manufactured to identify durability according to age of fiber-reinforced concrete which contains fiber reinforcement materials (polypropylene fiber, steel fiber, cellulose fiber) and structural property about flexural behavior and destruction of reinforced concrete beam, and a relation between load and deflection, crack and destruction according to increase of load and ductility capacity was examined. Fiber-reinforced concrete materials and other constructional materials were experimented and the result is presented as follows: The results obtained through material test of concrete and static experiment of members usings 1. The experiment shows that compressive strength of fiber-reinforced concrete was lower than that of non-reinforced concrete. 2. As a result of strength experiment according to different kinds of fiber, compressive strength of an experimented structure that contains cellulose fiber was the highest when age was 28. 3. When deflection of reinforced concrete beam was examined, it was reported that ductility capacity of the experimented structure that contains fiber-reinforced concrete was raise than that of non-reinforced concrete.
鐵筋콘크리트 보의 炭素纖維시트 補强에 따른 疲勞擧動에 관한 實驗的 硏究
김정섭(Kim Jeong-Sup),조창호(Cho Chang-ho),박영배(Park Young-bae),조철희(Cho Cheol-Hee) 대한건축학회 2002 大韓建築學會論文集 : 構造系 Vol.18 No.12
This study is an experimental study of reinforced-concrete beam with carbon fiber sheet under fatigue load. Non-strengthening and strengthening, kind of strengthening materials and the stress level in static or fatigue experiment are designed as the variables of experiment. The experimental results are as follows. The strengthening test specimen of non-resin CFS and of resin CFS indicate the increase of yield strength of 233% and 184% respectively in static experiment, its the fatigue strength prove 89.67% and 85.38% respectively in S-N curve of fatigue experiment. In this study, the test specimen reinforced with CFS has greater effects at static and fatigue yield strength, prevention of initial deflection and elastic deflection.
패각류가 함유된 철근콘크리트 보의 내력 및 거동에 관한 실험적 연구
김정섭(Kim Jeong-Sup),조창호(Cho Chang-Ho),고송균(Go Song-Kyoon),조철희(Cho Cheol-Hee),최진석(Choi Jin-Seok) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.1
This study makes experimental specimen to examine of concrete and structural characteristics of reinforced concrete beams such as shear destruction according to contents of shells in concrete using sea sand containing river sand and shells (8%, 10%, 20%, 30% and 40%) and age, evaluates its load, deflection, crack and destruction from load increase and ductility capacity and aims at supplying the data for applying it to actual structures. The results obtained through material test of concrete and static experiment of members using sea sand containing river sand and shells are as follows;<br/> As a result of strength test by shell contents, it is found that compressive strength of specimen using sea sand containing 8% of shells is highest and the more shell contents are, its compressive strength is reduced.<br/> Compressive strength of specimen using sea sand containing 8% of shells was reduced by 7.34% at 28 days of age and by 3.87% at 365 days of age compared to specimen using river sand.<br/> The flexural capacity test of reinforced concrete beam showed that specimen using sea sand containing shells has reduce ductility capacity compared to specimen using river sand.<br/> In strain of bar, specimen using river sand showed least result on tensile bar compressive bar and stirrup bar showed a great increase of strain of bar after yield. It is guessed that bar bear the compressive force and shear force after the loss of compressive strength of concrete.<br/> Therefore, in case of using sea sand containing shells, mixing and member design considering compressive strength and ductility capacity of concrete are needed. And it guessed that using sea sand containing over 10% of shells will be problematic.
김정섭(Jeong Sup Kim),김의식(Eui Sik Kim),양영성(Young Sung Yang),박진성(Jin Sung Park) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.3
Recently it has become common practice to cut multiple openings or large opening in the web of steel beams. This results in a considerable reduction of story height and saving in building costs. This paper is described to the ultimate strength and failure modes of the experimental work to the 23 beams, containing two rectangular openings with or without horizontal reinforcement. The results of the experiments are as follows ; 1) In case the width of web-post is narrow below 1.0H, the ultimate strength is fallen. 2) Failure modes of beams with multiple openings are composed of multiple opening interaction failure(failure mode A), single opening failure(failure mode B), multiple opening failure(failure mode C) in conformity to interaction between openings. The minimum width of web-post in order to become failure mode B is wide above 1.0H
전통 목구조 추녀부재의 구조적 재보강 특성에 관한 연구
김정섭(Kim Jeong-Sup),조철희(Cho Cheol-Hee),신용석(Shin Yong-Seok),유명환(Yoo Myung-Hwan),박춘걸(Park Chun-Geol) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.3
This study presents an experimental investigation of wood damaged by deflection from structural characteristics of hip rafter protrusions in traditional wooden frames. First, after the reinforcing damaged wood with a carbon fiber bar, the hip rafter was restrengthened by steel plates. Structural behaviors and reinforcement effects were examined through the experiment of the hip rafter. As a result of the hip rafter experiment, it was found that the specimen of damaged wood restrengthened by steel plates showed the reinforcement effects including an increase of yield load, ultimate load, and initial and plastic region stiffness, and internal lift control. In the comparison between theoretical and experimental values of ultimate load, experimental values were mostly higher than theoretical values. In addition, experimental values of the reinforced specimen were 9~70% higher than its theoretical values compared to the standard specimen and as the protruded length rate increased, reinforcement effects were remarkable. Restrengthening of the steel plate with bolt and nail in the reinforced specimen increased structural reinforcement effects with 6.4~9.2% in yield load and 9.3~12.6% in ultimate load compared to reinforcement with bolt only. Finally, it is considered that as reinforcement with steel plates can control external deflection and internal lift of hip rafter, structural reinforcement with steel plates, bolt and nail on the characteristics of natural wood material will be desirable.
김정훈(Kim Jeong-Hoon),신용석(Shin Yong-Seok),문금환(Moon Keum-Hwan),박춘걸(Park Chun-Geol),김정섭(Kim Jeong-Sup) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.5
This study made hybrid high-strength concrete mixed with polypropylene fiber and steel fiber to ensure ductility of high-strength reinforced concrete and prevent explosive spalling in fire. It conducted member experiment with this specimen and examined fire-resistant property of fiber on high-strength concrete, and obtained the following conclusions. As a result of fire resistance performance test of column mixed with fiber, standard specimen showed explosive spalling of 60 % compared to the total area. Hybrid fiber reinforced column showed minute crack, but not explosive spalling. In case of comparison with fire resistance time, standard specimen didn’t meet standard of notification by the Ministry of Land, Transport and Maritime Affairs, but hybrid fiber reinforced column ensured 3-hour fire resistance performance of such a notification. In addition, it showed double improvement of fire resistance performance compared to standard specimen.