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장극관,고태현,서대원,Chang, Kug-Kwan,Ko, Tae-Hyun,Seo, Dae-Won 대한건축학회 2012 대한건축학회논문집 Vol.28 No.1
Many existing reinforced concrete (RC) frame structures that had designed and constructed in Korea before 1997 do not meet the current seismic design requirements set forth by the Korea Building Code and have an inadequate safety assessment. For those structures constructed with insufficient strength and ductility, the required stiffness was also not provided. The frames of these structures have been designed to resist only gravity loads or gravity and moderate lateral loads and do not have proper reinforcement details needed to ensure ductile behavior. In this study, to improve the seismic capacity of masonry walls, hexagonal blocks were developed and the influence of masonry infilled wall on the seismic performance of RC frames that were designed in accordance with current code provisions were investigated. Four 1/2 scale, single story, single bay, frame specimens were tested. The parameters included that the strength of infilled walls using hexagonal blocks with respect to that of the reinforcemet and lateral load history were investigated. The experimental results were shown that infilled wall could significantly improve the performance of RC frames. The lateral loads developed by the infilled frame specimen were higher than that of the bare frame. It also were indicated that reinforced hexagonal block infilled walls could be potentially used to improve the performance of existing nonductile frames.
장극관,임호철,황기태,서대원,Chang, Kug-Kwan,Im, Ho-Chul,Hwang, Kee-Tae,Seo, Dae-Won 대한건축학회 2012 대한건축학회논문집 Vol.28 No.6
Seismic design of buildings has been well developed and is being continually updated and improved. But nonstructural elements in buildings are rarely designed with the same care or under the same degree of scrutiny as buildings. As a result, buildings that remain structurally sound after a strong earthquake often are rendered unserviceable due to damage to their nonstructural elements, such as access floors, telecommunication equipment and others. This damage has caused interruption of operations and large economic losses in the past. The objective of this study is to evaluate the seismic safety of computers and sensitive equipment of an existing internet data center(IDC) building. The approach to this study was to perform analytical and simulation studies of the seismic vulnerability of equipment in buildings. As a consequence, the floor acceleration are amplified and the secondary effects further deteriorate the earthquake resistant capability of the access floor systems.
장극관,서대원,천영수,Chang, Kug-Kwan,Seo, Dae-Won,Chun, Young-Soo 한국토지주택공사 토지주택연구원 2011 LHI journal of land, housing, and urban affairs Vol.2 No.4
프리캐스트 콘크리트는 현장작업을 최소화하고 공사품질을 보장할 수 있으며 공사기간을 단축시킬 수 있는 장점을 갖고 있다. 특히 계단실의 경우 재래식 거푸집을 사용할 경우 골조공사의 품질저하와 다수의 인력투입에 따른 생산성의 저하 및 시공의 어려움 등의 문제점이 있다. 본 연구에서는 PC 계단 접합부 상세를 개발하고, 제안한 접합부의 일체성확보와 사용성 및 안전성을 검증하기 위해 구조성능실험을 수행하였으며, 단순 핀접합 실험체에 비해 구속도의 증가, 내력, 강성 및 연성의 증가를 확인할 수 있었다. Compared with the traditional RC system, precast stairs can save construction time, reduce the cost of concrete casting, etc. This paper focuses on an investigation of improved continuous longitudinal joint details for PC stair systems. The performance of the precast concrete stair connections subjected to displacement control cyclic loading is compared with that of the monolithic connection. The developed connection is composed of U-rods and clamp joint metals. This paper proposes precast stair connection with improved structural performance and experimentally evaluates the structural performance of the proposed joints in terms of maximum load, displacement ductiliy, strain, crack and failure modes.
장극관 ( Chang Kug-kwan ),진병창 ( Jin Byung-chang ),천영수 ( Chun Young-soo ),서대원 ( Seo Dae-won ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In this paper, it is studied the influence of the damage occurred in the cable on dynamic character of the cable. Experimentally, it is examined the changes of natural frequencies of cables before and after damage for five specimens which have the character of tension cables in five World-Cup stadiums constructed in 2002. The result of experiments shows that with the decrease of the bending stiffness, the effect of the damage on the dynamic character of the cable is decreased, and if cable has the same length and damage location, the change of the dynamic character in the cable with the relatively large tension is small.
장극관 ( Chang Gug-kwan ),서대원 ( Seo Dea-won ),한태경 ( Han Tae-kyoung ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
Masonry structures are used throughout the world for the construction of residential buildings. However, from a structural viewpoint, the masonry material is characterized by a very low tensile strength; thus, masonry constructions often present diffuse fracture patterns. Moreover, masonry bearing and shear walls have been found to be vulnerable to earthquakes. In this study, to improve the seismic performance of masonry structures, hexagon blocks were developed and six hexagonal block walls were tested to failure under reversed cyclic lateral loading. This paper focuses on an experimental investigation of different types of hollow hexagonal block walls, i.e., walls with different hexagon blocks and with different reinforcing bar arrangements, subjected to slowly applied cyclic loads. The cracking and damage patterns and hysteretic feature are evaluated. Results showed that damage to blocks is reduced and brittle failure is avoided by the comparatively hexagonal blocks walls than the existing masonry walls.
장극관(Chang, Kug-Kwan),서대원(Seo, Dea-Won),고태현(Ko, Tae-Hyun),임호철(Im, Ho-Chul) 한국구조물진단유지관리학회 2011 한국구조물진단학회 학술발표회논문집 Vol.15 No.1
Masonry infilled walls can be frquently found as interior and exterior partision in reinforced concrete(RC) structures. In this study, to improve the seismic performance of masonry walls, hexagonal blocks were developed and the influence of masonry infilled walls on the seismic performance of reinforced concrete(RC) frames that were designed in accordance with current code provisions are investigated. Two 1/2 scale, single story, single bay, frame specimens were tested. The parameters investigated included that the strength of infill panels with respect to that of the lateral load history.
장극관(Chang, Kug-Kwan),고태현(Ko, Tae-Hyun),서대원(Seo, Dae-Won) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.1
Many existing reinforced concrete (RC) frame structures that had designed and constructed in Korea before 1997 do not meet the current seismic design requirements set forth by the Korea Building Code and have an inadequate safety assessment. For those structures constructed with insufficient strength and ductility, the required stiffness was also not provided. The frames of these structures have been designed to resist only gravity loads or gravity and moderate lateral loads and do not have proper reinforcement details needed to ensure ductile behavior. In this study, to improve the seismic capacity of masonry walls, hexagonal blocks were developed and the influence of masonry infilled wall on the seismic performance of RC frames that were designed in accordance with current code provisions were investigated. Four 1/2 scale, single story, single bay, frame specimens were tested. The parameters included that the strength of infilled walls using hexagonal blocks with respect to that of the reinforcemet and lateral load history were investigated.. The experimental results were shown that infilled wall could significantly improve the performance of RC frames. The lateral loads developed by the infilled frame specimen were higher than that of the bare frame. It also were indicated that reinforced hexagonal block infilled walls could be potentially used to improve the performance of existing nonductile frames.