• 제목/요약/키워드: high-strength concrete high-rise building

검색결과 159건 처리시간 0.02초

초고층 건축물의 수직부재 보정 방법에 관한 연구 (A Study on The Compensation Method of Vertical Members for High-rise building)

  • 이재옥;소광호;유인근;양극영
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2003년도 학술.기술논문발표회
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    • pp.33-36
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    • 2003
  • Time-dependent axial shortening in the cores and columns of tall concrete buildings requires special attention to ensure proper behavior for strength of the structure and the nonstructural element. The effects of column shortening, both elastic and inelastic, take on added significance and need special consideration in design and construction with increased height of structures. In this paper, the compensation method of column shortening are introduced. It could be concluded that the survey is a significant factor for the compensation of column shortening.

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Compressive Behaviour of Geopolymer Concrete-Filled Steel Columns at Ambient and Elevated Temperatures

  • Tao, Zhong;Cao, Yi-Fang;Pan, Zhu;Hassan, Md Kamrul
    • 국제초고층학회논문집
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    • 제7권4호
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    • pp.327-342
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    • 2018
  • Geopolymer concrete (GPC), which is recognised as an environmentally friendly alternative to ordinary Portland cement (OPC) concrete, has been reported to possess high fire resistance. However, very limited research has been conducted to investigate the behaviour of geopolymer concrete-filled steel tubular (GCFST) columns at either ambient or elevated temperatures. This paper presents the compressive test results of a total of 15 circular concrete-filled steel tubular (CFST) stub columns, including 5 specimens tested at room temperature, 5 specimens tested at elevated temperatures and the remaining 5 specimens tested for residual strength after exposure to elevated temperatures. The main variables in the test program include: (a) concrete type; (b) concrete strength; and (c) curing condition of geopolymer concrete. The test results demonstrate that GCFST columns have similar ambient temperature behaviour compared with the conventional CFST counterparts. However, GCFST columns exhibit better fire resistance than the conventional CFST columns. Meanwhile, it is found that the GCFST column made with heat cured GPC has lower strength loss than other columns after exposure to elevated temperatures. The research results highlight the possibility of using geopolymer concrete to improve the fire resistance of CFST columns.

PP섬유 혼입 고강도 경량골재콘크리트의 내화특성 (Fire Performance of Structural Lightweight Aggregate Concrete using PP fiber)

  • 송훈;추용식;이종규
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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    • pp.797-800
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    • 2006
  • Normally, Structural light-weight aggregate concrete(LWC) has been main used in high rise building with the object of wight loss. In spite of LWC have the advantage of light-weight, limit the use of strength restrictions by reason that explosive spalling in fire. Especially, LWC is occurred serious fire performance deterioration by explosive spalling. Thus, this study is concerned with fire performance of LWC for the purpose of using PP fibers prevent to explosive spalling. From the experimental test result, LWC is happened explosive spalling.

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반복하중을 받는 대형 콘크리트 판구조의 이력거동에 관한 실험적 연구-3층 대형판 구조체 실험결과를 중심으로 (Experimental Study on the Hysteretic Behavior of Large Concrete Panel Structures Subjected to Cyclic Load)

  • 서수연;박병순;이봉효;김성수;이원호;이리형
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1992년도 가을 학술발표회 논문집
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    • pp.179-184
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    • 1992
  • Four 3-story 1/2 scaled large concrete panel structures were designed and tested to estimate the seismic resistance capacity of large concrete panel high rise building systems, Test specimens were modeled three story of 24 or 15 story buildings and set up to represent the actural stress of the building . The axial force was constant and the horizontal force was loaded by ductility ratio. Results indicated that the joints of specimens were behavied monolithically to maximum strength. It was shown that the joint box connecting system had lower maximum strength and energy dissipation capacity than welding connection system, but had better deformation capacity.

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Contribution of Reinforced Concrete Floor Slabs to Lateral Behavior of Tall Buildings

  • Rehmanjee, Yasmin;Leslie, Benjamin;Lamianski, Dmitri;Chafart, Manuel
    • 국제초고층학회논문집
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    • 제11권1호
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    • pp.25-29
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    • 2022
  • This paper focuses on how the coupling of the columns and walls through the structural slab contributes to the overall stiffness and strength of lateral systems. The rationale and procedures behind the design approach, which may offer a shift from more conventional assumptions made regarding compatibility and connectivity of gravity and lateral structural systems, will be introduced. The impacts on serviceability and strength design will be discussed, and observations on key design and analysis approaches will be featured. Mass and stiffness assumptions will also be reviewed. A case study on the topic will be presented describing implementation of slab coupling into engineering of a building project.

탄소섬유 및 유리섬유로 보강한 합성보의 내력산정과 보강효과에 대한연구 (A Study on the Strength Capacity and the Strengthening Effects of Steel Reinforced Concrete(SRC) Beams with Carbon Fiber Sheets (CFS) and Glass Fiber Sheets (GFS))

  • 김희규;신영수;최완철;홍영균
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 봄 학술발표회 논문집
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    • pp.565-570
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    • 1997
  • This study is on the strength capacity and the strengthening effects of crarbon fiber sheets(CFS) and glass fiber sheets (GFS) on steel reinforced concrete(SRC) beams. SRC beams are often used on high-rise building construction to save story height and construction cost. However, there are no strengthening design code in Korea and most engineers design it as steel beams ignored the composite effect if reinforced concrete. Test results on steel reinforced concrete beams reveal thar the strength capacity of SRC beam is more than simple addition of steel and reinforced concrete beams. In case of steel reinforced concrete beams, ultimate moment capacity of strengthening beam of carbon fiber sheets is 120% of non-strengthening one.

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Challenges in Structural Design of Bumeo W-project

  • Kim, Jong Soo;Jo, Duck Won;Choi, Eun Gyu
    • 국제초고층학회논문집
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    • 제9권2호
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    • pp.167-173
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    • 2020
  • W-Project is 60-story mixed-use residential building complex project in Daegu, the third biggest city in South Korea. There are lots explorable items to be solved to secure structural safety and meet the serviceability requirements. This paper describes what kind of structural system is optimized based on the architectural requirements and structural components design and the grade of concrete strength altered on floors. The defining process of lateral resisting system of outrigger compared to the core ratio of typical plan is illustrated in detail.

한중콘크리트의 저온에 의한 강도지연 개선연구 (A Study on the improvement of Strength delay according to Low Temperature of Cold Weather Concrete)

  • 이상수
    • 한국건설순환자원학회논문집
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    • 제7권1호
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    • pp.51-59
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    • 2012
  • 최근의 초고층건축물의 건설로 인하여 겨울철에 타설하는 한중콘크리트의 문제점을 해결하기위한 노력이 이루어지고 있으며, 본 연구에서는 조기강도 개선을 위한 실험 변수별 배합확인 실험을 통해 조기강도 개선용 콘크리트의 표준배합을 설정하고 각요인별 강도특성을 검토하고자 하였다. 한중콘크리트 실험에서 OPC보다 OPC에 조기강도 특성을 개선한 시멘트와 3종조강시멘트가 우수하였다. 혼화제는 폴리카르본산계 혼화제가 강도발현 특성에 우수한 것으로 나타났으며, 혼화재의 경우 플라이애시의 사용으로 인한 조기강도 발현성능이 불리한 것으로 판단하여 본실험에서는 배제하였고, 강도발현을 위한 최적온도는 $12^{\circ}C$ 이상으로 나타났다.

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The influence of different factors on buildings' height in the absence of shear walls in low seismic regions

  • Keihani, Reza;Bahadori-Jahromi, Ali;Goodchild, Charles;Cashell, Katherine A.
    • Structural Engineering and Mechanics
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    • 제76권1호
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    • pp.83-99
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    • 2020
  • Shear walls are structural members in buildings that are used extensively in reinforced concrete frame buildings, and almost exclusively in the UK, regardless of whether or not they are actually required. In recent years, the UK construction industry, led by the Concrete Centre, has questioned the need for such structural elements in low to mid-rise reinforced concrete frame buildings. In this context, a typical modern, 5-storey residential building is studied, and its existing shear walls are replaced with columns as used elsewhere in the building. The aim is to investigate the impact of several design variables, including concrete grade, column size, column shape and slab thickness, on the building's structural performance, considering two punching shear limits (VEd/VRd,c), lateral drift and accelerations, to evaluate its maximum possible height under wind actions without the inclusion of shear walls. To facilitate this study, a numerical model has been developed using the ETABS software. The results demonstrate that the building examined does not require shear walls in the design and has no lateral displacement or acceleration issues. In fact, with further analysis, it is shown that a similar building could be constructed up to 13 and 16 storeys high for 2 and 2.5 punching shear ratios (VEd/VRd,c), respectively, with adequate serviceability and strength, without the need for shear walls, albeit with thicker columns.

잔골재 종류에 따른 내화피복용 모르타르의 고온 성상에 관한 연구 (Study on the High Temperature Properties of Fireproof Mortar Using Various Types of Fine Aggregate)

  • 임서형
    • 한국건설순환자원학회논문집
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    • 제2권2호
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    • pp.100-106
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    • 2014
  • 고강도 콘크리트는 구조적으로 우수하며 사용성 및 내구성이 뛰어나 건축물에서 그 활용성이 꾸준히 증가하고 있다. 그러나 화재처럼 고온에서 고강도 콘크리트는 폭렬이 발생될 가능성이 있으며, 폭렬 원인은 콘크리트 내부의 수증기압이 가장 큰 원인으로 알려져 있다. 콘크리트의 폭렬을 제어할 수 있는 일반적인 방법은 콘크리트 표면에 내화피복을 사용하여 화재 시 부재의 온도상승을 억제하는 방법이 있다. 이에 따라 본 연구에서는 각종 골재와 유기섬유를 사용하여 콘크리트 내화피복용 모르타르를 제조하고 그 고온 성상을 파악하고자 한다. 실험결과 퍼라이트와 폴리프로필렌 섬유를 사용한 모르타르는 내부공극과 밀도를 변화시켜 내부온도 상승을 지연시킨다. 그 결과 고강도 콘크리트의 폭렬을 방지할 수 있는 내화 피복재로 활용 가능하다.