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이방향 중공슬래브의 최적 중공형성체 형상 도출을 위한 해석적 연구
정주홍,최현기,이승창,최창식,Chung, Joo-Hong,Choi, Hyun-Ki,Lee, Seung-Chang,Choi, Chang-Sik 대한건축학회 2011 대한건축학회논문집 Vol.27 No.7
This paper presents optimal hollow sphere shapes in a biaxial hollow slab. To derive optimal shapes, numerical simulations using nonlinear Finite Element Methods were executed by the nonlinear finite element program 'LUSAS'. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective system which can reduce weight of slab. A biaxial hollow slab has hollow spheres within slab in order to reduce weight of slab. Because of reducing self-weight of slab by hollow spheres, size of vertical elements like walls and columns can be smaller and slabs span can be longer. A capacity of biaxial hollow slabs is influenced by the shape and volume of hollow spheres. Therefore, in this study, several biaxial hollow slabs which have different shapes of hollow spheres were analyzed by using the finite element method program in order to derive optimal hollow sphere shapes.
정주홍(Chung, Joo Hong),안남규(Ahn, Nam Kyu),최현기(Choi, Hyun Ki),최창식(Choi, Chang Sik) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
This paper presents optimal hollow sphere shapes in hollow slab by using finite element method program. Recently, various types of reducing slab self-weight systems are studied as the height and width of the building structures rapidly increase. Hollow slab system is widely known one of the effective reducing slab self-weight. Hollow slab has hollow spheres within the slab in order to reduce slab self-weight. Because of reducing slab self-weight by hollow spheres, size of vertical elements like wall and columns can be smaller and slab span can be longer. A capacity of Hollow slab is influenced by hollow sphere shapes. Therefore, In this study, several hollow slabs which has different hollow sphere shapes are analyzed by using finite element method program in order to derive optimal hollow sphere shapes.
도넛형 이방향 중공슬래브의 내화성능에 관한 실험적 연구
정주홍(Chung, Joo-Hong),조해정(Cho, Hae-Jeong),이승창(Lee, Seung-Chang),최현기(Choi, Hyun-Ki),최창식(Choi, Chang-Sik) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.12
The biaxial hollow slabs are decreased self-weight of slab and retained structural performance similar with general reinforced concrete slab. The structural performance of this system was evaluated through various study of biaxial hollow slab. But, for actual application of biaxial hollow slab, this system is important to evaluation for fire resistance performance as well as structural performance. However, there is a lack of research on fire endurance assessment of biaxial hollow slab. Generally, the reinforced concrete slab has great fire resistance performance caused by excellent thermal material properties of concrete. But, In case of biaxial hollow slab will be expected to show different temperature distribution and fire endurance performance compare to reinforced concrete slab. Because hollow slab has internal void space that occurs decreasing regenerative effect of concrete and formation of internal air layer. Therefore, this paper was performed the fire test of biaxial hollow slab with donut type shape. and evaluated fire resistance performance of donut type biaxial hollow slab using Fire resistance design of Euro Code2. The result of this study, the thickness of slab affects the load bearing of fire resistance and temperature of unheated side. Also distance between hollow shape and steel is significant influence factor on the fire resistance of donut type biaxial hollow slab.
이방향 중공슬래브의 최적 중공형성체 형상 도출을 위한 해석적 연구
정주홍(Chung Joo-Hong),최현기(Choi Hyun-Ki),이승창(Lee Seung-Chang),최창식(Choi Chang-Sik) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.7
This paper presents optimal hollow sphere shapes in a biaxial hollow slab. To derive optimal shapes, numerical simulations using nonlinear Finite Element Methods were executed by the nonlinear finite element program ‘LUSAS’. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective system which can reduce weight of slab. A biaxial hollow slab has hollow spheres within slab in order to reduce weight of slab. Because of reducing self-weight of slab by hollow spheres, size of vertical elements like walls and columns can be smaller and slabs span can be longer. A capacity of biaxial hollow slabs is influenced by the shape and volume of hollow spheres. Therefore, in this study, several biaxial hollow slabs which have different shapes of hollow spheres were analyzed by using the finite element method program in order to derive optimal hollow sphere shapes.
도넛형 이방향 중공슬래브 뚫림전단 강도 및 파괴거동에 대한 실험적 연구
정주홍(Chung, Joo-Hong),윤주리(Yoon, Ju-Ri),이승창(Lee, Seung-Chang),최창식(Choi, Chang-Sik) 대한건축학회 2014 大韓建築學會論文集 : 構造系 Vol.30 No.4
This paper presents the punching shear strength and failure behavior of biaxial hollow slab with donut type hollow-shaper. Until now, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A biaxial hollow slab system is widely known as one of the effective slab system which can reduce self-weight of slab. According to previous studies, the biaxial hollow slab has weakness in slab-column connection compared with solid slab. And previous studies pointed out reduced cross-section area of concrete by hollows as the cause. It is assumed in this study that the shape of hollows and the location of hollow-shaper exert influence on the punching shear strength of biaxial hollow slabs. Therefore, donut type hollow-shaper which was suggested as the optimal hollow shape in previous study was used in this study. To verify the punching shear strength and failure behaviour of donut type biaxial hollow slab, punching shear tests were conducted. 4 test specimens were used for test parameters. One was conventional RC slab and 3 were hollow slabs. The test parameter was the area of critical section which were determined by the number of hollow-shaper around the column. The punching shear strength of the donut type biaxial hollow slabs are 87%∼103% of solid slabs and superior to generic biaxial hollow slabs. And punching shear cracks occurred at the first perimeter line of donut type hollows.