• Title/Summary/Keyword: 고층 무량판 슬래브

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Lateral Resisting Capacity for CFT Column to RC Flat Plate Slab Connections (CFT 기둥 - RC 무량판 슬래브 접합부의 횡저항 성능)

  • Song, Jin-Kyu;Song, Ho-Beom;Oh, Sang-Won;Lee, Cheol-Ho
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.65-68
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    • 2008
  • This paper verified the lateral resisting capacity of CFT column-RC flat plate connection in comparison with general RC column-flat plate connection and detected moment capacity and ductility capacity of connection according to lateral force-displacement ratio. We made and tested specimens which have different variables respectively and as a result derive a following conclusion. In CFT specimen a critical section was extended and initial stiffness and moment increased 35%, 25$^{\sim}$35% respectively in comparison to general RC column specimen. In all specimens generally shear governed behaviors and in CFT specimen complemented with seismic band, flexure behavior region of slab was extended and also ductility ratio and energy absorptance increased.

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Prediction and Evaluation on Inequality Shortening and Long-term Deflection of High-rise Flat Plate Structure using 3D Finite Element Analysis (3차원 유한요소해석을 이용한 고층 무량판 슬래브 구조물의 부등축소량 및 장기처짐 예측 평가)

  • Shim, Hak-Bo;Park, Soon-Jeon
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.159-160
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    • 2020
  • Flat plate structures are designed in the form of long span due to the development of construction materials and the improvement of construction technology. However, a high-rise structure of a flat plate of 50 less floors is constructed without detailed review of the inequality shortening, long-term deflection of the slab, and cracks. Therefore, it is possible to examine the case of defects in the structure due to deformation and damage of non-structures such as crack and leak, deflection of the door frame, and deformation of equipment ducts. In this study, it is a high-rise structure, and the inequality shortening and long-term deflection of the slab of the flat plate structure were evaluated through finite element analysis, and it was confirmed that prior precision analysis and correction during construction is necessary.

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Two-way Shear Strength Evaluation of Transfer Slab-Column Connections Through Nonlinear FE Analysis (비선형유한요소해석을 통한 전이슬래브-기둥 접합부의 2면 전단강도 평가)

  • Jeong, Seong-Hun;Kang, Su-Min
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.31 no.6
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    • pp.315-329
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    • 2018
  • Recently, RC transfer slab systems have been used widely to construct high-rise wall-type apartments for securing parking space or public space. However, it is problem that the design method and structural performance evaluation method developed for thin RC flat slab are still used in the design of the transfer slab whose thickness is very thick and therefore structural behavior is expected to be different from RC flat slab. Thus, for the rational design of the transfer slab, the ultimate shear behavior of the RC transfer slab system is required to be analyzed properly. Accordingly, in the present study, the two-way shear behavior of the transfer slab was analyzed using nonlinear FEM according to various design parameters such as thickness of the transfer slab, strength of concrete, shear span ratio, and reinforcement ratio. In addition, the two-way shear strength evaluations of RC transfer slab by the existing evaluation methods were verified by comparing those with the results of nonlinear FEM analysis.

One-Way Shear Strength of Donut Type Biaxial Hollow Slab Considered Hollow Shapes and Materials (중공형상 및 재료의 영향을 고려한 도넛형 이방향 중공슬래브의 일방향 전단강도)

  • Chung, Joo-Hong;Lee, Seung-Chang;Choi, Chang-Sik;Choi, Hyun-Ki
    • Journal of the Korea Concrete Institute
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    • v.24 no.4
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    • pp.391-398
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    • 2012
  • This paper presents the shear capacities of biaxial hollow slab with donut type hollow sphere. Recently, various types of slab systems which can reduce self-weight of slabs have been studied for increasing constructions of taller and larger building structures. 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 hollow slab has low shear strength, compared to solid slab. Also, the shear capacities of biaxial hollow slab are influenced by the shapes and materials of hollow spheres. However, the current code does not provide a clear computation method for the shear strength of hollow slab. To verify the shear capacities of this hollow slab, one-way shear tests were performed. Four test specimens were used for test parameters. One was conventional RC slab and others were hollow slabs. The test parameters included two different shapes and materials of plastic balls. The shape parameters were donut and non-donut forms and the material parameters were general plastic and glass fiber plastic. The results showed that the shear strengths varied depending on hollow shapes and materials used in the slab.

Analysis of CFT Column-RC Flat Plate Interior Connections under Lateral Load (횡하중을 받는 CFT기둥-RC무량판 접합부의 해석연구)

  • Song, Jin-Kyu;Song, Ho-Bum;Oh, Sang-Won;Kim, Byung-Jo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.867-870
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    • 2008
  • Flat plate system has many advantages, story height reduction, a term of works shortening and changeableness of space, etc. However structures become a tendency of higher stories and when we use RC column, the size of column grow larger. For this reason the use of CFT column is increasing more and more. Accordingly, this study carried out the nonlinear finite element analysis. As a result of analysis moment strength of the connection increased but ductility decreased as the top reinforcement ratio in th effective width increased. And moment strength and ductility of the connection decreased as gravity load ratio decreased. In the case that shearhead length is not more than 0.27m, the effectiveness of shearhead length on the moment strength and ductility of the connection were small relatively to other variables. Initial stiffness and moment strength of connection increased as slab thickness increased

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