• 제목, 요약, 키워드: Slab joint

검색결과 210건 처리시간 0.051초

Seismic behavior and strength of L-shaped steel reinforced concrete column-concrete beam planar and spatial joints

  • Chen, Zongping;Xu, Deyi;Xu, Jinjun;Wang, Ni
    • Steel and Composite Structures
    • /
    • v.39 no.3
    • /
    • pp.337-352
    • /
    • 2021
  • The study presented experimental and numerical investigation on the seismic performance of steel reinforced concrete (SRC) L-shaped column- reinforced concrete (RC) beam joints. Various parameters described as steel configuration form, axial compressive ratio, loading angle, and the existence of slab were examined through 4 planar joints and 7 spatial joints. The characteristics of the load-displacement response included the bearing capacity, ductility, story drift ratio, energy-dissipating capacity, and stiffness degradation were analyzed. The results showed that shear failure and flexural failure in the beam tip were observed for planar joints and spatial joint, respectively. And RC joint with slab failed with the plastic hinge in the slab and bottom of the beam. The results indicated that hysteretic curves of spatial joints with solid-web steel were plumper than those with hollow-web specimens. The capacity of planar joints was higher than that of space joints, while the opposite was true for energy-dissipation capacity and ductility. The high compression ratio contributed to the increase in capacity and initial stiffness of the joint. The elastic and elastic-plastic story deformation capacity of L-shaped column frame joints satisfied the code requirement. A design formula of joint shear resistance based on the superposition theory and equilibrium plasticity truss model was proposed for engineering application.

고강도 콘크리트 보-기둥-슬래브 접합부의 반복하중 실험 (Experimental Study of High Strength Concrete Beam-Column-Slab Connections subjected to cyclic loading)

  • 오영훈;오정근;장극관;김윤일
    • 한국콘크리트학회:학술대회논문집
    • /
    • /
    • pp.339-344
    • /
    • 1995
  • In the design of ductile moment-resisting frames (DMRFs) following the strong column-weak beam dsign philosophy, it is desirable that the joint and column remain essentially elastic in order to insure proper energy dissipation and lateral stability of the structure. The joint has been identified as the "weak link" in DMRFs because any stiffness or strength deterioration in this region can lead to substantial drifts and the possibility of collapse due to P-delta effects. Moreover, the engineer is faced with the difficult task of detailing an element whose size is determined by the framing members, but which must resist a set of loads very different from those used in the design of the beams and columns. Four 2/3-scale beam-column-slab joint assemblies were designed according to existing code requirements of ACI 318-89, representing interior joints of DMRFs with reinforced high strength concrete. The influence on aseismic behavior of beam-column joints due to monolithic slab, has been investigated.estigated.

  • PDF

Structural Behavior of Cement Concrete Pavement at Transverse Joint Using Model Test

  • Ko, Young-Zoo;Kim, Kyung-Soo;Bae, Ju-Seong
    • KCI Concrete Journal
    • /
    • v.12 no.2
    • /
    • pp.23-30
    • /
    • 2000
  • This paper presents behavior of concrete pavement at transverse joint subject to static test load. The test was conducted on 1/10 scale model in the laboratory. Load transfer across the crack is developed either by the interlocking action of the aggregate particles at the faces of the joint or by a combination of aggregate interlock and mechanical devices such as dowel bars. In this study, significant three variables considered to the performance of joints were selected. : (a)diameter of dowel bars(2.5mm, 3.0mm, 4.0mm), (b)presence or absence of dowel bars, (c)aggregate types(crushed stone, round stone). Experimental results were analyzed to find relationships among displacement of discontinuous plane at jointed slab, load transfer efficiency and joint opening, etc. Displacement of discontinuous plane at joint was decreased according to the increase of dowel bar diameter. In addition, it is found that model slabs made using crushed stone had better load transfer characteristics by aggregate interlock than model slabs made using similarly graded round stone. Displacement of discontinuous plane was increased according to the increase of loading. In addition, it was decreased as dowel diameter(2.5mm, 3.0mm, 4.0mm) was increased. In the case of slab without dowel bars, displacement of discontinuous plane was greatly increased and load transfer effciency of slab applied crushed stone was shown 30 percent greater than round stone. In addition, load transfer efficiency of slabs, which were made using crushed and round stone without dowel bars, was decreased to 20 percent and 30 percent, respectively as it was compared with slabs made us-ing dowel bars.

  • PDF

슬래브 형식 프리캐스트 모듈러교량 종방향 연결부의 휨강도 및 균열 사용성에 관한 정적재하실험 (Static Load Tests on Flexural Strength and Crack Serviceability of a Longitudinal Joint for the Slab-Type Precast Modular Bridges)

  • 이정미;이상윤;송재준;박경훈
    • 한국콘크리트학회논문집
    • /
    • v.27 no.2
    • /
    • pp.137-145
    • /
    • 2015
  • 슬래브 형식 프리캐스트 모듈러교량은 횡방향으로 분절되어 제작된 프리캐스트 모듈을 현장에서 조립하는 형태의 교량으로서 분절된 프리캐스트 모듈 사이에는 종방향 연결부가 형성되며, 프리캐스트 모듈의 조립은 모듈 사이에 고성능 무수축 모르타르를 주입한 후에 횡방향으로 긴장력을 도입함으로써 이루어진다. 본 연구에서는 연결부의 휨 거동을 바탕으로 설계단계에서 산정된 횡방향 도입 긴장력 수준의 적정성 및 연결부의 형상이 휨 거동에 미치는 영향을 검토하기 위해 슬래브 형식 프리캐스트 모듈러교량의 연결부를 적용한 실험체를 이용한 4점 재하 휨 실험과 3점 재하 휨 실험을 수행하였다. 4점 재하 휨 실험은 긴장력의 변화가 연결부의 휨강도에 영향을 미치며 연결부의 형상은 순수한 휨모멘트가 작용하는 단면의 휨강도에는 영향을 미치지 않는다는 결과를 보여주었다. 3점 재하 휨 실험은 연결부에 휨모멘트와 전단력을 동시에 작용시키는 실험 방법으로, 연결부의 형상이 휨강도와 균열 사용성에 영향을 미친다는 결과를 보여주었다. 두 가지의 휨 실험 결과로부터 본 연구에서 적용한 긴장력은 적정하였으며 두 개의 전단키를 갖는 연결부가 균열 사용성 측면에서 유리하다는 것을 확인할 수 있었다.

강섬유 보강 초고강도 콘크리트의 확대 타설을 통한 기둥 하중 전달 성능 향상 (Improved Transmission of UHSC Column Loads by Puddling of Fiber Reinforced UHSC)

  • 이주하;양준모;이승훈;윤영수
    • 한국콘크리트학회논문집
    • /
    • v.19 no.2
    • /
    • pp.209-216
    • /
    • 2007
  • 본 연구는 강섬유 보강 초고강도 콘크리트가 적용된 슬래브-기둥 접합부의 구조적 특성을 파악하였다. 2개의 슬래브-기둥 시험체와 4개의 독립 기둥 시험체의 기둥 하중 전달 실험이 수행되었다. 기둥 하중 실험 수행시, 슬래브-기둥 접합부의 실제 구속 상태를 고려하기 위해 슬래브 하중을 적용하였다. 주 변수로는 강섬유 보강 초고강도 콘크리트의 확대 타설이며, 이에 더하여 슬래브의 접합부 구속 효과, 강섬유 보강, 그리고 접합부의 콘크리트 강도 등이 실험을 통해 파악되었다. 또한, ACI Code(2005)와 CSA Standard(2004)의 예측식과 실험 결과를 비교하였다. 슬래브-기둥 접합부를 통한 기둥 하중 전달에 대한 강섬유 보강 초고강도 콘크리트의 효과를 실험을 통해 확인하였다.

PC 기둥-H형강보의 볼트접합부에관한 실험적 연구III (An Experimental Study III on the Bolted Connection between H-Beam and Precast-Concrete Column)

  • 여인석;박순규
    • 한국콘크리트학회:학술대회논문집
    • /
    • /
    • pp.307-310
    • /
    • 2005
  • The PCS system, which consists of precast concrete column and steel beam, has been under development. Experimental test has been carried out to investigate the structural performance of the system under earthquake. Two types of test specimens of beam-column joints are designed in order to compare the performances. One is the system with reinforced concrete slab and the other is without slab. It is found that the system with slab could satisfy all of the requirements from ACI Criteria such as strength, stiffness degradation and energy dissipation capacity except initial stiffness. It is also investigated that the stiffness of the joint is belong to rigid joint type according to Bjorhovde criterion. And it is observed that the partial-composite system between beam and slab is more effective than full-composite system in the respect of the energy dissipation capacity of the system.

  • PDF

활절점으로 연결된 철근콘크리트 슬래브 내력에 기존 슬래브 철근이 미치는 영향 (Effection of The Existing Reinforcement on The Strength of Reinforced Concrete Slabs Connected by Hinged Jointeds)

  • 심규관;김상식;최광호;임주혁;이정윤
    • 한국콘크리트학회:학술대회논문집
    • /
    • /
    • pp.271-274
    • /
    • 2005
  • In this research, 13 RC slabs connected by hinged joints were tested. the new slab was connected to the existing slab by hinge joint injecting dowel bars between two slabs. Main parameters of the slabs were the spacing of the dowel bars (150mm, 300mm, and 450mm) and the locations of the longitudinal reinforcement of the old slab. The test results indicated that the joint strength of the RC test slabs having various types of dowel bars was about twice that calculated by the ACI 318-02 code. The locations of the longitudinal reinforcement of the old slab slightly increased the strength of the slabs connected by hinged joints.

  • PDF

철근트러스 압접 데크플레이트 바닥 구조의 설계 프로그램 (Design Program of Deck Plate Slab System with Non-welding Truss Type Reinforced Bar)

  • 윤명호;오상훈
    • 한국디지털건축인테리어학회논문집
    • /
    • v.8 no.1
    • /
    • pp.57-64
    • /
    • 2008
  • There are many problems in present truss-deck slab system for example welding defect, segregation, water leakage, rust and tarnish etc. These problems may be caused by spot welding thin galvanized steel plate and lattice bar. The TOX Joining Systems is to join metal sheets of different material and thickness with and without coating or painting without adding heat or a joining part. Newly developed TOX-deck slab system using non-welding joint is free from above mentioned problems. The objects of this study are suggestion of design strength of TOX joint by experimental and statistical analyses and development of window based program to design the TOX-deck slab system.

  • PDF

Investigation of Composite Action on Seismic Performance of Weak-axis Column-tree Moment Connections

  • Xu, Yinglu;Lu, Linfeng;Zheng, Hong
    • 국제강구조저널
    • /
    • v.17 no.3
    • /
    • pp.1199-1209
    • /
    • 2017
  • This paper presents an experimental study on a developed weak-axis column-tree moment connection subjected to horizontal cyclic loading. In order to study possible positive or negative effect of a composite slab on the seismic performance of the proposed connection, six cruciform specimens were designed and constructed in pairs, where one specimen was bare steel joint and the other involved a composite slab. The standard, cover-plate, and material-changed connection details were considered. The test program is described in detail, and then the structural behavior of test specimens is discussed based on the test data. The tests revealed that although designed with 50% degree of shear connection, the concrete slab still caused obvious upward shift of the neutral axis and increase the strain demand on the bottom flange. But it is clear from the comparison of results that the composite joint specimens performed slightly better than the bare steel counterparts in terms of load-displacement hysteretic curves and energy dissipation capacity, as the concrete slab could effectively enhance the stability of the steel beam and delay the deterioration of the strength and stiffness. The cover-plate connection appears to be one of the more promising moment connection schemes which are able to deliver a much higher level of stability and energy dissipation capacity. The maximum magnitude of slab-steel beam interface slip was less than 0.5 mm, indicating that the concrete floor slab and steel beam could work well together under 50% partial shear connection.

다우얼 바의 저진동 슬래브 궤도 시스템 적용 가능성 (Application possibility of dowel bar in low floating slab system)

  • 박성재;김용재;박명균;전종수;이두화;박만호
    • 한국철도학회:학술대회논문집
    • /
    • /
    • pp.665-670
    • /
    • 2009
  • 본 연구의 선행기술조사결과 플로팅궤도 슬래브에는 dowel bar 등의 별도의 슬래브 연결부 보강이 없었다. 본 연구모델에 비해 선행기술조사 대상 슬래브의 연장이 매우 짧으며, 긴지간의 슬래브에 연결부에 대한 보강이 없다면 단부에서의 단차에 의해 슬래브의 파괴가 예상된다. 따라서 dowel bar 등의 추가적인 보강이 요구된다. 본 연구에서는 dowel bar의 일반적인 특성과 국내외 dowel bar에 대한 선행기술에 대하여 조사함으로써, 추후 수행될 해석연구의 자료를 확보하고자 하여 그 적용가능성을 검토하고자 하였다.

  • PDF