중공형성체가 이방향 중공 슬래브에 미치는 영향에 관한 해석적 연구

정주홍(Chung Joo-Hong),최현기(Choi Hyun-Ki),이승창(Lee Seung-Chang),오정근(Oh Jung-Keun),최창식(Choi Chang-Sik) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

This paper presents the impact of hollow sphere on biaxial hollow slab. To derivate the impact of hollow sphere on biaxial hollow slab, numerical simulations using nonlinear Finite Element Methods are ongoing by the nonlinear finite element program LUSAS. Recently, various types of slab systems which can reduce self-weight of slabs are 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. A biaxial hollow slab has hollow spheres within slabs in order to reduce self-weight of slabs. Because of reducing self-weight of slabs 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 has different shapes of hollow spheres are analyzed by using the finite element method program in order to derive the impact of hollow sphere on biaxial hollow slab

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.

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.

도넛형 중공슬래브의 휨 강도 및 휨 강성

정주홍(Chung, Joo-Hong),최현기(Choi, Hyun-Ki),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.5

This paper presents the flexural capacities of biaxial hollow slabs with donut type hollow shapes. Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures increase. A biaxial hollow slab system is widely known as one of the effective system which can reduce self-weight of slab. A biaxial hollow slab has hollow spheres within slabs in order to reduce self-weight of slabs. The capacities of biaxial hollow slab are influenced by the shapes, volume of hollow spheres. According to analytical studies, the hollow slab with donut type hollow sphere had good flexural capacities such as strength, stiffness and deflection. To verify the flexural capacities of this hollow slab such as strength and stiffness, flexural tests were performed. Three test specimens were planned to verify the effect of test parameters. One was conventional RC slab and others were donut type hollow slabs. The donut type hollow slabs have two different fixing methods of plastic balls. The one is used diagonal steel cage and the other is fixed with only its geometrical shapes without additional steel cage.

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.

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.

비선형유한요소해석을 통한 이방향 중공슬래브의 전단거동분석

강수민(Kang, Su-Min),김진욱(Kim, Jin-Wook),최경규(Choi, Kyoung-Kyu),박홍근(Park, Hong-Gun) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.12

Recently, biaxial hollow slab system is widely used since it can reduce self-weight of RC slabs. In order to reduce self-weight of slabs, biaxial hollow slabs have void hollow spheres within the webs of the slabs which do not mainly contribute to the flexural behavior of the slabs in ultimate state. However, the partial absence of webs reduces the shear strength of the slabs. Therefore, it is necessary to reasonably understand the shear performance of the biaxial hollow slabs. In this study, the shear behavior of biaxial hollow slabs was analyzed using nonlinear FEM according to various design parameters such as concrete strength, reinforcement ratio, the diameter and spacing of void spheres, and shear span to depth ratio. The existing shear strength models were evaluated to investigate their applicability to the shear strength prediction of biaxial hollow slab system and the strain-based shear strength model was modified to estimate the shear strength of biaxial hollow slab system.

2방향 중공슬래브 구조시스템의 지진거동 평가

박현재(Park Hyun-Jae),박용구(Park Yong-Koo),최병태(Choi Byeong-Tae),이동근(Lee Dong-Guen) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)

This study investigates seismic behavior of biaxial hollow slabs developed to reduce noise and vibration problems. To this end, equivalent plate element models corresponding to 3D models with solid elements were developed for example biaxial hollow slabs. Then, effective beam width method was introduced for the push-over analysis. To evaluate the performance under earthquake loads, push-over analysis of a 5-story flat-slab example structure was performed using the effective beam width model derived from the equivalent plate model. Comparing the results of analyses of the hollow and solid slab structures, seismic performance of the hollow slab structure turned out to be improved from that of solid slab structure. And the results of analysis were compared with those of solid flat-plate structure. Because of the reduction of weight due to the inner hollow balls, the biaxial hollow slab structure effectively respond to earthquake loading rather than solid flat-plate structure.

보행하중에 대한 2방향 중공슬래브의 진동성능 평가

김민균,박현재,이동근,황현식,김현수 한국지진공학회 2009 한국지진공학회논문집 Vol.13 No.5

2방향 중공슬래브 시스템은 슬래브 두께가 증가해도 자중은 크게 증가하지 않으면서 솔리드 슬래브에 비해서 휨강성이 크게 저하되지 않는 장점이 있다. 따라서 최근 넓은 바닥판 구조에 대한 수요가 커지면서 2방향 중공슬래브 시스템에 대한 관심이 증가하고 있다. 그러나 이러한 장스팬 구조의 경우 바닥판 진동의 증가에 의한 사용성에 문제가 발생할 수 있고 특히 2방향 중공슬래브의 경우 기존의 구조시스템과 동적특성이 상이하다. 따라서 본 연구에서는 기존의 라멘조 시스템과 2방향 중공슬래브 시스템의 바닥진동성능을 보행하중을 가하여 검토해 보았다. 본 연구에서는 해석의 효율성을 위하여 2방향 중공슬래브의 동적특성을 정확히 나타낼 수 있는 등가의 플레이트 모델을 사용하여 시간이력해석을 수행하였다. 해석결과를 바탕으로 일본건축학회와 미국표준협회에서 제안하는 진동성능평가 기준을 이용하여 진동성능 평가를 수행한 결과 2방향 중공슬래브가 사무실 수준의 진동성능을 만족하고 있는 것으로 나타났다. Considering that the weight of a biaxial hollow slab system is not increased with an incremental increase in its thickness, and that the flexural stiffness of a biaxial hollow slab is not significantly lower than that of a general solid slab, there has been a growing need for biaxial hollow slab systems, because long span structures are in great demand. In a long span structure, the problem of vibration of floor slabs frequently occurs, and the dynamic characteristics of a biaxial hollow slab system are quite different from the conventional floor systems. Therefore, in this study, the floor vibration of a biaxial hollow slab system subjected to walking load is investigated in comparison with a conventional floor slab system. For the efficiency of time history analysis, an equivalent plate slab model that can precisely represent the dynamic behavior of a biaxial hollow slab system is used. From the analytical results, it was determined that vibration of a biaxial hollow slab system subjected to walking load is evaluated as "office-level vibration," according to the classifications of the architectural institute of Japan and ANSI.

2방향 중공슬래브 구조시스템의 비선형 지진거동 평가

박용구,김현수,고현 아이스트,박현재,이동근 한국지진공학회 2011 한국지진공학회논문집 Vol.15 No.1

최근 들어 슬래브 차음성능에 대한 관심이 커지고 있으며 이에 대응하여 슬래브 두께 증가가 요구되고 있다. 또한 건축물의 효율적인 공간 활용을 위하여 장스팬의 바닥판 시스템이 많이 사용되고 있다. 이러한 요구를 만족하기 위해 개발된 바닥판 시스템중의 하나가 2방향 중공슬래브이다. 2방향 중공슬래브의 구조적 성능을 확인하기 위해서는 지진이 발생하였을 때의 안전성에 대한 검토가 반드시 필요하다. 따라서 본 연구에서는 재료비선형 시간이력해석을 통하여 2방향 중공슬래브의 지진하중에 대한 거동을 평가하였다. 효율적인 시간이력해석을 위하여 기존에 제안된 등가플레이트 모델을 사용하였고, 또한 유효보폭법을 적용한 비선형 모델을 이용하여 2방향 중공슬래브를 적용한 예제구조물의 내진성능을 평가하였다. 이를 통하여 2방향 중공슬래브를 사용한 구조물이 동일한 슬래브 두께의 일반 플랫 플레이트 구조물에 비하여 내진성능이 저하되지 않음을 확인 할 수 있었다. Recently, there has been an increased interest in the noise isolation capacity of floor slabs, and thus an increase of slab thickness is required. In addition, long span floor systems are frequently used for efficient space use of building structures. In order to satisfy these requirements, a biaxial hollow slab system has been developed. To verify the structural capacity of a biaxial hollow slab system, safety verification against earthquake loads is essential. Therefore, the seismic behavior of a biaxial hollow slab system has been investigated using material nonlinear time history analyses. For efficient time history analyses, the equivalent plate element model previously proposed was used and the seismic capacity of the example structure having a biaxial hollow slab system has been evaluated using the nonlinear finite element model developed by the equivalent frame method. Based on analytical results, it has been shown that the seismic capacity of a biaxial hollow slab system is not worse than that of a flat plate slab system with the same thickness.