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대구지역 삼국시대 성곽 연구 -낙동강변 성곽을 중심으로-
조효식 ( Hyo Sik Cho ) 대구사학회 2007 대구사학 Vol.89 No.-
The gists of this study are as follows. (1) The fortress of Hwa-won, Mun-san, Jul-gok, Seol-hwa which located in west outskirts of Daegu region distribute in systemic network. (2) The construction era of Hwa-won fortress could be earlier than others because of its remains and rampart form. (3) It can be concluded that Hwa-won fortress was constructed at the 4th century, while the others were constructed at the 5th century. and it could be assumed that they were used at the 5th century mainly. (4) Fortress of Seol-hwa is assumed to be a strategic point as a scale of fortress, location and the inner facilities. (5) The mutual observation and connection was possible through stonemounded watch tower placed on the top point of the fortresses and they had formed defense system toward west-side to the north-side of Nak-dong River, based on their systemic distribution. (6) It could be conclude that Silla constructed fortresses located in this area through their remains, tombs, main monitoring direction. The purpose of construction of fortress is related to boosting control and defense in the whole area of the middle basin of Nak-dong River.
지진하중을 받는 철근콘크리트 골조면내 강재 대각가새 보강시스템 내진성능 평가
하기주 ( Ha Gee-joo ),이동렬 ( Yi Dong-ryul ),조효식 ( Cho Hyo Sik ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
지진하중을 받는 기존 철근콘크리트 건물의 내진성능을 개선하고 구조물의 안전성의 증대, 사용성의 향상 및 구조물의 수명을 연장시키기 위하여 철근콘크리트 골조면내에 강재 대각가새 보강시스템을 제안하였다. 지진하중을 받는 철근콘크리트 골조 및 골조면내 강재프레임과 대각가새 보강시스템의 내진성능 평가를 위하여 3개의 표준적인 기존 철근콘크리트 골조 및 보강시스템을 제작하고 실험을 실시한 결과 최대내력 및 에너지소산능력이 각각 2.3~4.7배 증가하였으며, 향후 실제 철근콘크리트 건물의 내진성능 개선 시 활용 할 수 있을 것으로 판단된다.
고인성섬유 복합재료와 배근상세를 활용한 철근콘크리트 골조면내 전단벽 보강시스템 내진성능 평가
하기주 ( Ha Gee-joo ),이동렬 ( Yi Dong-ryul ),조효식 ( Cho Hyo Sik ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
지진하중을 받는 기존 철근콘크리트 건물의 골조면내 전단벽이 구조물의 노후화로 인해 부재 내력 및 내진성능이 저하되므로 골조면내 전단벽에 연성능력과 강도개선이 뛰어난 고인성 섬유재료와 배근상세를 활용한 철근콘크리트 골조면내 전단벽 보강시스템을 개발하였다. 고인성 섬유복합재료 및 배근상세를 활용하여 철근콘크리트 골조면내 전단벽에 고인성섬유 복합모르타르, 경계면 앵커 및 배근상세로 보강하여 구조성능을 평가하고 내력 및 내진성능 개선을 통해 보다 안전하고 건전한 구조물을 확보하고자 한다.
CFRP 보강시스템을 적용한 철근콘크리트 골조면내 전단벽의 내진성능 평가
하기주 ( Ha¸ Gee-joo ),이동렬 ( Yi¸ Dong-ryul ),하영주 ( Ha¸ Young-joo ),조효식 ( Cho¸ Hyo Sik ),전찬목 ( Jun¸ Chan Mok ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
지진하중을 받는 기존 철근콘크리트 건물의 내진성능을 개선하고 구조물의 안전성의 증대, 사용성의 향상 및 구조물의 수명을 연장시키기 위하여 CFRP 보강시스템을 적용한 철근콘크리트 골조면내 전단벽의 내진성능 개선기술을 제안하였다. 지진하중을 받는 철근콘크리트 골조면내 전단벽에 CFRP 보강시스템을 적용한 후 내진성능 평가를 위하여 3개의 표준적인 기존 철근콘크리트 골조면내 전단벽 및 CFRP 보강시스템을 적용한 실험체을 제작하고 실험 및 분석한 결과 최대내력 및 에너지소산능력이 각각 1.40, 1.79배 증가하였으며, 향후 실제 철근콘크리트 건물의 내진성능 개선 시 활용할 수 있을 것으로 판단된다.
패널존 보강 프레임을 활용한 기존 철근콘크리트 골조의 내진성능 개선
하기주(Ha, Gee-Joo),이동렬(Yi, Dong-Ryul),하영주(Ha, Young-Joo),강현욱(Kang, Hyun-Wook),조효식(Cho, Hyo-Sik),황상진(Hwang, Sang-Jinn) 대한건축학회 2018 대한건축학회 학술발표대회 논문집 Vol.38 No.1
In this study, panel zone reinforced frames were constructed and tested to improve the seismic performance of existing reinforced concrete buildings. Specimens SRF-ES, designed by the retrofitting of steel frame in reinforced concrete frame were increased its maximum load carrying capacity by 2.53 times and its energy dissipation capacity by 2.54 times in comparison with standard specimen SRF for a displacement ductility of 7.
초고층 철근콘크리트 건물에 적용 가능한 보-기둥 접합부의 내진성능 개선 기술 개발
하기주 ( Ha Gee Joo ),신종학 ( Shin Jong Hack ),최민권 ( Choe Min Kwon ),이영범 ( Lee Young Bum ),조효식 ( Cho Hyo Sik ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.5 No.2
In this paper, experimental research was carried out to study the hysteretic behavior of reinforced high-strength concrete beam-column joints designed by high performance techniques, such as application of high-strength concrete, reducing of joint regions damage, moving of beam plastic hinge, and steel fiber concrete. Specimens(HJAI, HJCI), designed by moving of beam plastic hinge and development of structural performance were sufficiently moved away 20cm, 30cm from the column face respectively due to adding supplemental intermediate longitudinal reinforcement over a specific length 1.5d and application of closed Solving the congestion of reinforcement and throughly placing of concrete in reinforced beam-column joint, specimens(HJRS1, HJRS2), replaced shear reinforcement into steel fiber concrete were showed stable hysteresis behavior, sufficient maximum load carrying capacity, and satisfactory crack pattern.
초고층 철근콘크리트 건물의 적용 가능한 고성능 보-기둥 접합부의 개발
河基柱,曺孝植 慶一大學校 1999 論文集 Vol.16 No.6
In this dissertation, experimental research was carried out to study the hysteretic behavior of reinforced high-strength concrete beam-column joints designed by high performance techniques, such as application of high-strength concrete, reducing of joint regions damage, moving of beam plastic hinge, and steel fiber concrete. Specimens(HJAI, HJCI), designed by moving of beam plastic hinge and development of structural performance were sufficiently moved away 20cm, 30cm from the column face respectively due to adding supplemental intermediate longitudinal reinforcement over a specific length 1.5d and application of closed stirrup. Solving the congestion of reinforcement and throughly placing of concrete in reinfroced beam-column joint, specimens(HJRSI, HJRS2, HJRS3), replaced shear reinforcement into steel fiber concrete were showed stable hysteresis behavior, sufficient maximum load carrying capacity, and satisfactory crack pattern.
강섬유보강 고성능 철근콘크리트 보-기둥 접합부의 내진성능 평가 및 개선
하기주,신종학,조효식 경일대학교 산업기술연구소 1999 産業技術硏究所 論文集 Vol.6 No.-
In this dissertation, experimental research was carried out to study the hysteretic behavior of reinforce high-strength concrete beam-column joints designed by high performance techniques, such as application of high-strength concrete, reducing of joint regions damage, moving of beam plastic hinge, and steal fiber concrete. Solving the congestion of reinforcement and thoroughly placing of concrete in reinforced beam-column joint, specimens(HJRS1, HJRS2, HJRS3), replaced shear reinforcement into steal fiber concrete were showed stable hysteresis behavior, sufficient maximum load carrying capacity, and satisfactory crack pattern. Specimen HJRS3, designed by solving the congestion of reinforcement, thoroughly placing of concrete and application of steel fiber concrete and application of steel fiber concrete, was increased its maximum carrying capacity by 18% in comparison with the standard specimen HJC for displacement ductility of 3. For displacement ductility of 7, these were falled and successively crushed the concrete of beam at the 15∼20㎝ range of inside beam. Increasing the percent of steel fiber incorporated, spacing of crack was happed widely into inside beam.
초고층 철근콘크리트 건물의 보-기둥 접합부 구조성능 평가 및 개선
河基柱,曺孝植 慶一大學校 1999 論文集 Vol.16 No.3
In this dissertation, experimental research was carried out to study the hysteretic behavior of reinforced high-strength concrete beam-column joints designed by high performance techniques, such as application of high-strength concrete, reducing of joint regions damage, moving of beam plastic hinge, and steel fiber concrete. Specimens(HJAI1, HJAI2, HJCI), designed by the development of earthquake-resistant performance, moving of beam plastic hinge, and new disign approach, were attained the moving of beam plastic hinge and developed significantly earthquake-resistant performance of such joints. Especially, specimen HJCI, designed by the supplemental intermediate longitudinal reinforcement and the closed stirrup of confinement of concrete in beam, was evaluated very excellent new design details of reinforced beam-column joints. Specimens(HJAI1, HJAI2, HJCI), designed by moving of beam plastic hinge and development of structural performance were sufficiently moved away 20cm, 30cm from the column face respectively due to adding supplemental intermediate longitudinal reinforcement over a specific length 1.0d and 1.5d and application of closed stirrup.