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- 저자 : 장극관(Chang Kug Kwan) (검색결과 57 건)
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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.
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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.
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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.
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장극관(Chang, Kug-Kwan),임영철(Lim, Young-Chul),서대원(Seo, Dae-Won) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.1
Non-structural elements of a building are not a part of the main load resisting system. Therefore, there are often neglected from the structural design point of view. 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. This paper reviews the design philosophy and design provisions of several international seismic codes, and compare design lateral forces recommended in these codes.
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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.
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장극관(Chang, Kug-Kwan),유하나(Yoo, Ha-Na),서대원(Seo, Dae-Won) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.10
Reinforced concrete framed structures in urban areas are usually infilled with interior and exterior masonry walls. However, the effect of masonry infilled wall is often neglected in the analysis of infilled walls by structural engineers, as it is in current practice. But, experimental studies revealed that hexagonal block infilled walls have favourable effects on strength and stiffness of structures. The objective of this paper is to propose a nonlinear macro model for the lateral load analysis of reinforced concrete frames infilled with hexagonal blocks. The analysis procedure, based on the experimental and analytical studies reported in the literature, accounts for the effect of infilled walls. The results of the analyses were compared to damage and residual cracks observed on the masonry infilled walls. Analytical studies conducted shows that hexagonal block infilled wall could adequately be modeled by single and double diagonal compression struts.
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장극관(Chang, Kug-Kwan),임호철(Im, Ho-Chul),황기태(Hwang, Kee-Tae),서대원(Seo, Dae-Won) 대한건축학회 2012 大韓建築學會論文集 : 構造系 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.
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변동풍하중을 받는 고층건물의 시간이력 해석시 입력동하중의 최적간격
장극관(Chang Kug-Kwan),윤정환(Yoon Jung-Hwan) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
The purpose of this study is to propose the optimal distance of input load for efficient time history analysis on tall buildings. For the purpose of this study, fluctuating wind force for time history analysis are simulated by the one-dimensional multi-variate spectral representation method using Karman spectrum about along-wind direction and Liang spectrum about across-wind direction. Through comparison between the simulated and target spectrum of the wind field, this technique has been proved to be efficient and reliable. Optimal applied load distance is verified by comparing top acceleration standard deviation values obtained from time history analysis with those of wind tunnel test for the selected buildings models.
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