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先加力 후 補修-補强한 鐵筋콘크리트 壓縮部材의 構造特性에 관한 實驗的 硏究
신용석,최진석,김판선,조철희,손순채,김정섭 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
This study examined the Stress and structural characteristics of reinforced concrete compressive member repair and strengthening by CFS and GFS after pre-loading. The following results were obtained. The results of compressive testing by the kind of fiber suggested that: In CFS, Specimen increased by about 26.9% and strengthening after pre-loading, by about 111.8%, compared with after strengthening, In GFS, Specimen increased by about 69.0% and repaired and models after pre-loading, by about 76.7%, compared with after strengthening. In the compressive testing, strengthen with CFS-Specimen showed a brittle fracture and strengthen with GFS-Specimen represented ductile fracture. More increasing in stress of Specimen, and repair and Strengthening specimen after pre-loading than loading specimen after strengthening suggested the strengthen effect of fiber.
신용석,이설,김판선,조철희,김정섭 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)
1) As a result of compressive strength experiment, rupture compressive strength showed more increases in specimens of 15% and 20% of Cockle shells in those of non-mixture. Comparing compressive strength between no-mixed Specimens and Specimens of containing Cockle shells, Specimens containing Cockle shells showed higher strength in 60 days of age, and as ark Cockle is contained and age is elapsed, compressive strength is also increased. 2) To sum up the above experimental results, it is found that using splitted Cockle shells as aggregate for concrete by 10% - 20% showed the same or higher compressive strength and shear strength as concretes using general aggregate and it can be used as substitute aggregate of concrete. It is considered that for future use of splitted Cockle shells as substitute concrete aggregate, continuous researches of its durability, applicability and economy are needed.
고막 貝殼의 콘크리트 잔골재로 재활용 방안에 관한 연구
김정섭,김광섭,김판선 한국건축시공학회 2004 한국건축시공학회지 Vol.4 No.1
1) As a result of compressive strength experiment, rupture compressive strength showed more increases in specimens of 15% and 20% of Cockle shells in those of non-mixture.Comparing compressive strength between no-mixed Specimens and Specimens of containing Cockle shells, Specimens containing Cockle shells showed higher strength in 60 days and 90 days of age, and as ark Cockle is contained and age is elapsed, compressive strength is also increased. In addition, estimation of compressive strength by reactive hardness in concrete using Cockle shells as aggregate shows low reliability.2) As a result of experimenting compressive strength after heating, Specimens containing Cockle shells and non-mixed Specimens showed similar strength at 200℃, but compressive strength was lowered as content of Cockle shells increased at over 400℃ and heating temperature was higher. It is because Cockle shells was fired by heat and then its adhesion and bonding capacity were lost. 3) To sum up the above experimental results, it is found that using splitted Cockle shells as aggregate for concrete by 10%~20% showed the same or higher compressive strength and shear strength as concretes using general aggregate and it can be used as substitute aggregate of concrete.It is considered that for future use of splitted Cockle shells as substitute concrete aggregate, continuous researches of its durability, applicability and economy are needed.
철근비에 따른 탄소섬유쉬트로 보강된 고강도 콘크리트 기둥의 거동에 관한 실험적 연구
이설 ( Lee Sul ),김판선 ( Kim Pan-sun ),김광석 ( Kim Kwang-suk ),조성찬 ( Jo Seong-chan ),장정수 ( Jang Jeong-soo ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
The purpose of this experimental study is to evaluate the strength characteristics and strengthening effects of reinforced concrete column confined with carbon fiber sheets. The main variables in this test are concrete strength and pre-loading. In the test, a total of twelve specimens have a 1.5, 3, 5 reinforcement ratio, which were concentrically loaded, have been used. While the non-confinement specimens with carbon fiber sheets were appeared sudden failure after shell-concrete was tom off, strength enhancement was showed on the specimens confined laterally with carbon fiber sheets.
혼화재를 사용한 콘크리트의 비파괴 시험에 의한 강도 추정에 관한 연구
김정섭,신용석,조철희,김판선 대한건축학회 2006 大韓建築學會論文集 : 構造系 Vol.22 No.4
This study made member specimen for taking specimen, core with the concrete mixing normal concrete, admixture and conducted the same air curing as field conditions. After performing destructive and nondestructive test by age, estimate expression was suggested by analyzing correlations between compressive strength, rebound number and ultrasonic pulse velocity and the results are as follows.As a result of comparing error rate of existing expressions and this estimation expression, error rate of this estimation is reduced compared to existing expressions and has higher reliability.When conventional concrete expression is applied to admixture concrete, error rate occurs and then this study suggests the following estimation expressions depending on types of admixture concrete.
조철희 ( Cheol Hee Cho ),김대성 ( Dae Sung Kim ),김판선 ( Pan Sun Kim ),조윤희 ( Youn Hee Cho ),김정섭 ( Jeong Sup Kim ) 조선대학교 공학기술연구원 2009 공학기술논문지 Vol.2 No.2
These studies experimentally investigates flexural behavior and reinforcing effects of sleeper(駕木) member in storied tower house(樓架構) as follows. As a result of sleeper member test, standard sleepers without CFB reinforcement show flexural cracks at the bottom member at the beginning of loading stage and leads 10 fracture. However, reinforced specimens with CFB show initial shrinkage at the upper part of specimen by compression. instead of flexural cracks at the bottom, and finally show compressive failure or fracture after failure of CFB and it proves that reinforcing effects Reinforced specimen showed higher strength in yield strength by 60/0-38%. and ultimate strength by 8%~17%, than standard specimen. This is regarded as strengthening effect of the timber encased strengthened by powerful tensile strength armature. Reinforted specimen shows higher Ductile Coefficient increase of average 152% compared than standard specimens and it proves that higher structural ductility can be expected in reinforced specimens.
전통 목구조 팔작지붕 추녀부재의 구조적 보강에 관한 연구
조철희(Cho Cheol-Hee),신용석(Shin Yong-Seok),문금환(Moon Kum-Hwan),김판선(Kim Pan-Sun),김정섭(Kim Jeong-Sup) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
These studies experimentally investigates structural behavior and reinforcing effects by strengthening the Carbon Fiber Bar(CFB) overhanging length ratio of hip rafter(春舌) in hipped-and-gabled roof(八作屋蓋) house as follows. 1) As a result of hip rafter member test, it is found that reinforced specimen shows increased yield strength by 13%~33.6%, and ultimate strength than non-reinforced standard specimen depending on the ratio of overhanging length by 0.6%~34.3%. Also, in yield strength, based on the ratio of overhanging length increases, flexural stress shows decrease of 1%~26% in standard specimen and of 5%~20% in reinforced specimen. 2) As a result of comparing standard specimen to reinforced specimen according to the ratio of overhanging length of hip rafter, Ductile Coefficient shows increase in reinforced specimen of ⅠType by 17%, but D.C. of standard specimen and reinforced specimen in ⅡType and ⅢType were similar. As a result of experiments and analysis with hip rafter member in traditional wooden structure, proposed retrofitting method with encased CFB is more rational than existing reinforcement methods such as slide installation, steel band reinforcement, plastering mud on the ceiling and core load adjustment and putting stone in the inside considering archetype preservation, structural safety and durability of cultural properties.