• Title/Summary/Keyword: SPLICE

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Simplified Design Equation of Splice Length of Deformed bars in Compression (압축을 받는 이형철근의 단순화된 이음 설계식)

  • Chun, Sung-Chul;Lee, Sung-Ho;Oh, Bo-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.33-34
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    • 2010
  • A compression lap splice becomes an important issue due to development of ultra-high strength concrete. Based on the basic form of design equations for development lengths of deformed bars and hooks in tension, simplifed design equation of deformed bars in compression was proposed using regression analyses.

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Etructural Performance Evaluation of Columns in a Reinforced Concrete Ordinary Moment Frame Building (철근콘크리트 보통모멘트조건물의 기두에 대한 구조성능 평가)

  • 배성진;한상환;이리형
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.440-445
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    • 2000
  • The purpose of this study is to investigate the structural performance of columns in an Reinforced Concrete Ordinary Moment Frame building. For this purpose, a 3-story building was designed according to the Korea seismic design provisons and ACI 318-99, and the columns of in the first story were constructed. The columns were classified into interior and columns. For each interior and exterior columns, upper and lower parts ate modeled by the 2/3 scale experimental specimens. The specimens for lower part columns have lap splice. The interior columns were tested under the constant axial force, while the exterior columns were tested under the fluctuating axial force. Based on the results of the experiments, the effects of the lap splice and axial force on the column performance are evaluated.

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Experimental Research on Development and Splices Length in High-Strength Concrete Flexural Members (고강도 콘크리트 휨부재의 정착 및 겹침이음길이에 관한 실험적 연구)

  • 이기열;김우;정기오
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.865-871
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    • 2003
  • This paper presents the test results of 24 beam-end specimens to investigate the effect of concrete strength and cover thickness on the development resistance capacity in tensile lap splice length regions. The results showed that as higher strength concrete was employed, nor only development resistance capacity was influenced by cover thickness, but also more sufficient safety factor reserved shorter than the lap splice length provision in current design code. From experimental research results, high-strength concrete development length was not inverse ratio of ($\sqrt{f_{ck}}$) but directly inverse of $f_{ck}$, and it is also said that there is a certain limit length of the embedded steel over which the assumption of uniform bond stress distribution is valid specially for high-strength concrete not having a same embed length such as normal-strength concrete in current design criteria hypothesis.

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Rigid-Body-Spring Networks를이용한 철근콘크리트의 Lap Splice 설계 모델 시뮬레이션

  • Yun, Seung-Hyeon;Park, Ji-Un
    • Proceeding of EDISON Challenge
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    • 2017.03a
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    • pp.180-186
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    • 2017
  • 거의 모든 철근콘크리트 구조물의 보강 강재는 분할된 두개 이상의 철근으로 제작되며, 이러한 철근의 분할 부위를 평행한 두개의 철근으로 겹쳐 설치하는 것을 겹이음(Lap splice)이라고 부른다. 일반적으로 겹이음 설계는 무리없이 설계 강도를 만족시킬 뿐만 아니라 충분히 긴 수명을 가진다. 그러나 550MPa 이상의 항복 강도를 갖는 철근이나 인장 부재의 설계, 초고성능 섬유보강 콘크리트의 보강재 설계와 같은 경우, 현행 철근 겹이음 설계만으로는 그 한계가 발생한다. 따라서 현 겹이음 설계는 관련 기준의 추가와 구조적인 측면에서의 개선이 필요할 것으로 보여지며, 이를 위해 적절한 실험과 데이터 분석, 그리고 컴퓨터를 이용한 새로운 설계 모델의 개발 등의 과정이 필요할 것으로 여겨진다. 본 연구는 균질하지 않은 물성의 파괴를 다루는 RBSN(Rigid-Body-Spring Networks)을 통한 컴퓨터 시뮬레이션으로 더 효과적이고 정확한 겹이음 설계가 가능할 것으로 판단하고, 실제 모델링으로 그 가능성을 검증하였다.

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Application of PC Beam-Column Interior Joint with Splice Type Re-bar (PC 다층 연성 골조시스템의 현장적용 사례 연구)

  • Kim Joon-Ho;Jeon Byong-Kap;Park Soon-Kyu;Kim Gwang-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.05a
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    • pp.9-13
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    • 2006
  • The purpose of this study was to introduce the applied care of PC beam-column interior joint with splice type rebar. In this case, although the erection time of the introduced case was a little bit higher than that of general precast concrete method, this method was more effective than general precast concrete method in aspect of direct cost and the number of column joint. Therefore, this method could be adopted in the construction of the commercial and residential building in the future.

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A Hierarchical Clustering Algorithm Using Extended Sequence Element-based Similarity Measure (확장된 시퀀스 요소 기반의 유사도를 이용한 계층적 클러스터링 알고리즘)

  • Oh, Seung-Joon
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.5 s.43
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    • pp.321-327
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    • 2006
  • Recently there has been enormous growth in the amount of commercial and scientific data. Such datasets consist of sequence data that have an inherent sequential nature. However, only a few of the existing clustering algorithms consider sequentiality. This study presents a similarity measure and a method for clustering such sequence datasets. Especially, we present an extended concept of the measure of similarity, which considers various conditions. Using a splice dataset, we show that the quality of clusters generated by our proposed clustering algorithm is better than that of clusters produced by traditional clustering algorithms.

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An Experimental Study on Effects Transverse Reinforcement in Lap-Spliced Tension Reinforcing Bars (인장철근의 겹침이음에서 횡보강근의 효과에 관한 실험적 연구)

  • 이호준;최선아;연규원;박찬수
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.879-884
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    • 2000
  • In this study, an experimental work is conducted to evaluate the bond performance between reinforcing bars and surrounding concrete in a lapped splice. The major variable of this test is a transverse reinforcement in lap-spliced tension reinforcing bars. The test results indicate that the bond strength per unit splice length increases with an increase in the transverse reinforcement factor $K_{\alpha}$. The specimens taken less than (c+$K_{tr}$)/$d_b$=3.0 tend to be very brittle at failure. But the specimens taken longer than (c+$K_{tr}$)/$d_b$=3.0 tend to be somewhat ductile at failure.

Analytical Study on Splice Performances with the Vertical Noncontact Lapped of Reinforcing Bars (수직으로 비접촉 겹침이음된 철근의 이음성능에 관한 해석적 연구)

  • Lee Ho-Jin;Kim Seung-Hun;Ha Sang-Su;Moon Jeong-Ho;Lee Li-Hyung;Lee Yong-Taeg
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.05a
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    • pp.171-174
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    • 2005
  • In this study, new moment-resisting precast concrete beam-column joint is proposed for moderate seismic regions. It has the connection reinforcing bars, penetrated the joint and lap-spliced with the bottom bars of precast U-beam. To evaluate the performance for noncontact lapped splice, analytical works were conducted. Major variables for FEM analysis are the length of lap, the diameter of connection reinforcing bars, and the distance between lapped bars. The results of this study show thar the these variables has much influence on strength and deformation of lapped joint.

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Effect of Construction Element on the Mechanical Properties of Carbon Fiber Sheet (시공요소가 탄소섬유쉬트의 역학적 특성에 미치는 영향)

  • 이한승;유영찬;최근도;최거선;류화성;김긍환
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.1073-1078
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    • 2000
  • This study is to investigate the effect of construction element such as the number of CFS ply, curing temperature, splice length and curing periods on the mechanical properties of Carbon Fiber Sheet (CFS). Through the tensile tests of CFS specimens, it can be said that the reduction factor stemmed from the number of CFS ply must be considered in the calculation of the design tensile strength of CFS. Also, the minimum splice length of CFS and curing period in $20^{\circ}C$ to satisfy the standard tension strength of CFS are over 5cm and after 3days, respectively. The measuring error of epoxy resin have no effect to tension strength of CFS until $\pm$20% error.

Similitude in Flexural Bond Behavior of Small-Scale Reinforced Concrete Beams (축소모델 철근콘크리트 보의 휨부착거동에 있어서의 상사성)

  • 이한선;고동우
    • Journal of the Korea Concrete Institute
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    • v.11 no.3
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    • pp.47-57
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    • 1999
  • The small-scale models have been utilized for the prediction of inelastic behavior of reinforced concrete structures for several decades. The parameters that affect the similitude between the model and prototype are various. Among them, the effect of bond between the model reinforcement and the model concrete is one of the most important factors. The study reported herein is addressed to verifying this similitude in bond behavior. The simple beams which have the lap splice at the midspan were made and flexural tests were performed under two-point loading. The length of lap splice are varied from 0.4ld through 0.7ld and up to 1.0ld where ld is the development length of the reinforcement. The selected scales are 1/1, 1/5, 1/10 and 1/12. Two prototype specimens and three models were tested in addition to the associated material tests and the test results are compared from the viewpoint of similitude.