• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.1091-1096
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• 2001

Generally, in a steel girder and the concrete slab act as a composite structure, the connectors must have adequate strength and stiffness. If there are no horizontal or vertical separations at the interface, the connectors are described as rigid, and complete interaction can be said to exist under these idealized circumstances. In previous study, it was considered that the strength of stud is affected by the stud diameter, height of stud and compressive strength of concrete. The differences between previous study and this study are variables, which are shank diameter of shear connector, the spacing of shear connector, the size of specimen and the row of shear connector. So this paper, as a study on the strength of shear connector with the spacing of shear connector, size of specimen (block-out size), row of shear connector and shank diameter of shear connector resulted from the push-out specimen are conducted with ABAQUS program. It is to investigate the effects of characteristics of these factors. The load-slip relations obtained from the experiments are compared with those of analyses. From these results, the trends of stress are stress estimated and compared with push-out test.

• 한국강구조학회 논문집
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• 제27권1호
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• pp.63-75
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• 2015

본 연구에서는 앵글을 전단연결재로 사용하여 합성보의 휨성능을 실험적으로 조사하였다. 실험의 주요변수는 앵글의 크기와 간격 및 콘크리트가 합성 전과 합성 후의 휨에 대한 전체적인 거동을 실험적으로 검증하였다. 또한 중공PC슬래브와 일반RC슬래브와 같이 사용하였을 때의 휨성능을 비교하였다. 이를 종합적으로 판단하면, 앵글을 전단연결재로 사용한 합성보의 휨성능은 앵글의 간격을 적절하게 배치시키면 예상내력보다 25-55% 이상의 공칭내력을 보유하고 있음을 확인할 수 있었다. 예상한 바와 같이, 합성보의 내력에 미치는 앵글의 변수를 살펴보면 앵글의 크기가 클수록 앵글의 간격이 좁을수록 합성보의 내력이 상승함을 확인할 수 있었다. 또한 중공PC슬래브에서도 앵글을 사용한 합성보의 성능이 잘 발휘됨을 실험적으로 검증하였다.

• Steel and Composite Structures
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• 제43권3호
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• pp.311-325
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• 2022

For multi-story structural systems, Korean steel industry has fostered development of a steel-concrete composite beam. Configuration of the composite beam is characterized by steel angle shear connectors welded to a U-shaped cold formed-steel beam. Effects of shear connector orientation and spacing were studied to evaluate current application of the angle shear connector design equation in AC495. For the study, interfacial shear resistance behavior was investigated by conducting 24 push-out tests and attuned using unreinforced push-out specimens. Interfacial shear to horizontal slip response was reported along with corresponding failure patterns. Pure shear connector strength was also evaluated by excluding concrete shear contribution, which was estimated in relation to steel beam-slab interface separation or interfacial crack width.

• Steel and Composite Structures
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• 제3권4호
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• pp.289-306
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• 2003

A series of tests was conducted to study the behaviour of steel-composite sandwich beams under low velocity hard impact. Damage characteristic and performance of sandwich beams with different spacing of shear connector were evaluated under impact loading. Thin steel plates were used as top and bottom skins of the sandwich beams and plain concrete was used as the core material. Shear connectors were provided by welding of angle sections on steel plates. The sandwich beams were impacted at their midpoint by a hemi-spherical nose shaped projectile dropped from various heights. Strains on steel plates were measured to study the effects of impact velocity or impact momentum on the performance of sandwich beams. Spacing of shear connectors is found to have significant effects on the impact response of the beams.

• Computers and Concrete
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• 제17권2호
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• pp.227-240
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• 2016

An analytical study was conducted to investigate the effect of the shape and spacing of modified inclined studs used as shear connector between concrete and steel plate on the cyclic behavior of steel plate concrete (SC) shear wall. 9 different analysis cases were adopted to determine the optimized shape and spacing of stud. As the results, the skeleton curves were obtained from the load-displacement hysteresis curves, and the ultimate and yielding strengths were increased as the spacing of studs decrease. In addition, the strength of inclined studs is shown to be bigger compared to that of conventional studs. The damping ratios increased as the decrease of stiffness ratio. Finally, with decreasing the spacing distance of studs, the cumulative dissipated energy was increased and the seismic performance was improved.

• 한국전자파학회논문지
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• 제27권12호
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• pp.1084-1096
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• 2016

본 논문에서는 12.5 Gbps의 전송 속도를 갖는 고속 직렬 인터페이스 커넥터(high-speed serial interface connector)의 설계 및 분석 방법을 제안한다. 고속 직렬 인터페이스 커넥터는 다양한 매질로 구성되며, 내부 선로도 복잡한 구조를 가지고 있으므로, 선로의 불연속 부분의 각각을 임피던스 정합하기가 매우 어렵다. 따라서 커넥터의 각 부분을 단순화한 커넥터 라인(connector line)의 구조를 제안하였으며, 이 구조에서 R, L, C, G 파라미터를 추출하고 차동 모드 임피던스를 분석하며, TDT(Time Domain Transmissometry)와 TDR(Time Domain Reflectometry)을 이용하여 임피던스 불연속(impedance discontinuity)을 최소화 하는 방법을 제시한다. 본 논문은 단순화한 커넥터 라인에서 추출된 분석 방법 및 결과를 고속 직렬 인터페이스 커넥터에 적용하였다. 제안한 커넥터는 총 44개의 핀(pin)으로 구성되며, 본 논문에서는 4개의 핀의 폭과 간격을 변경하여 신호 전달 특성을 분석하였다. 분석결과, 접지 핀의 폭이 증가할수록 임피던스는 소폭으로 감소하고, 접지핀과 신호 핀 사이의 간격이 증가할수록 임피던스가 증가했다. 또한, 신호 핀의 폭을 증가시키면 임피던스가 감소하며, 신호 핀과 신호 핀 사이의 간격을 늘리면 임피던스가 증가하였다. 최초 커넥터 임피던스 특성은 $96{\sim}139{\Omega}$ 사이에서 변화되는 값을 나타내었으나, 제안된 커넥터 구조를 적용했을 때 임피던스 특성은 $92.6{\sim}107.5{\Omega}$ 사이의 값으로 나타나, 설계 목표 $100{\Omega}{\pm}10%$를 만족함을 보였다.

• Journal of the Korean Wood Science and Technology
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• 제41권1호
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• pp.12-18
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• 2013

기존의 목재 데크는 보행자의 반복하중으로 못이 인발되어 안전사고가 발생할 우려가 있다. 또한, 데크재와 장선재를 접합 시 접합구에 의하여 목재가 갈라지거나 접합구의 재질에 따라 목재의 부후 속도가 빠르게 진행되는 문제점이 있다. 본 연구에서는 국내 A사에서 개발한 플라스틱 연결구를 사용하여 데크 유닛을 제작, 휨 하중시의 접합내력 성능을 평가하였다. 데크재는 Southern yellow pine (Pinus palustris Miller)을 사용하였다. 접합구의 종류를 달리하여 장선 간 간격(400, 600 mm)에 따른 데크 유닛의 휨 내력 시험을 실시하였다. 시험결과 탄소강 재질의 접합구로 강화플라스틱 연결구에 접합한 시험체의 평균 휨 내력(장선재 간 간격 : 400, 600 mm)이 가장 높게 측정되었으며, 장선재의 폭(40, 50, 70, 80 mm)에 따른 휨 내력 시험 결과 장선재의 폭이 40 mm일때 가장 높은 내력이 측정되었다.

• 한국구조물진단유지관리공학회 논문집
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• 제11권2호
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• pp.145-154
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• 2007

본 연구는 조적조 치장벽체의 신축과 보강공사에 사용될 수 있는 나선형 긴결철물을 사용하여 내부벽체와 긴결된 치장벽체의 전단거동실험을 행하여 이 벽체의 구조적 성능을 검증하고 적절한 시공간격 형태 등을 제안하기 위한 실험연구이다. 본 연구를 통해 벽체의 Rocking거동에 있어서는 나선형 긴결철물을 사용한 벽체가 기존 시공법의 벽체보다 동일 간격에서는 우수한 전단저항능력을 나타내며, 간격이 30%정도 증가하여도 유사한 능력을 발휘한다. 짧은 간격에서의 긴결도는 기존 시공법보다 상당히 높음으로 고층건물의 치장벽체로 연와조 조적체의 적용가능성을 높일 수 있을 것으로 판단된다.

• Steel and Composite Structures
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• 제38권4호
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• pp.399-414
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• 2021

This paper aims to verify the feasibility of rubber rings to mitigate the shear concentration in perfobond connector (PBL) groups. Firstly, modified push-out tests for five specimens with four holes were conducted to investigate the effects of rubber rings on the shear mechanism of PBL groups. The test results showed that by employing rubber rings on partial holes, more shear forces were distributed to the holes without rubber rings. The rubber rings significantly improved the slip ability of the specimens, and the ductility of PBL groups is dependent on the number and thickness of rubber rings. Subsequently, three-dimensional numerical models were established and validated by the experimental results. According to the plastic strain distribution in concrete dowels, the action principle of rubber rings in PBL groups was explained. Furthermore, the parametric study was conducted to investigate the influential factors on shear distributions, including the width of steel plates, the hole spacing, the number of holes, the rubber ring thickness, and the positions of rubber rings. The parametric analysis results showed that the redistribution of shear forces is significantly affected by the rubber rings with the smallest thickness. By properly employing rubber rings in PBL groups, the shear forces of holes are more even. Finally, an analytical model for PBL groups with rubber rings was proposed to predict the shear distribution at the serviceability stage.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 추계 학술발표회 논문집
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• pp.297-300
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• 2006

One of main issues of the FRP-concrete composite member is shear connection between FRP and concrete in order to secure composite behavior of FRP and concrete. To solve this problem, perfobond rib FRP shear connector is introduced for the mechanical shear connection. In this study, experimental study was carried out on the perfobond rib FRP shear connectors in order to develop the effective details of perfobond rib FRP shear connectors. Pull-out test specimens were manufactured with FRP plate with holes embedded in concrete block. Main parameters considered in this study were diameter of holes, ratio of spacing between the centres of holes to the diameter of holes, and thickness of FRP plates. Test results are discussed according to above parameters compared with other empirical expressions for steel perfobond rib connector.