• Steel and Composite Structures
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• 제14권5호
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• pp.493-509
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• 2013

Bending behavior of reinforced concrete slabs encased over shallow I-sections at different levels of compression heads were investigated in present study. 1500 mm long I-sections were used to create composite slabs. Compression heads of monolithic experimental members were encased at different levels into the concrete slabs. Shear connections were welded over some of the I-sections. The testing was carried out in accordance with the principles of four-point loading. Results revealed decreasing load bearing and deflection capacities of composite beams with increasing encasement depths into concrete. Mechanical properties of concrete and reinforcing steel were also examined. Resultant stresses calculated for composite beams at failure were found to be less than the yield strength of steel beams. Test results were discussed with regard to shear and slip effect.

• 한국강구조학회 논문집
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• 제11권2호통권39호
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• pp.181-190
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• 1999

본 논문은 신형상의 합성용 데크플레이트 개발에 따른 합성슬래브의 구조적 거동에 관하여 연구한 것이다. 신형상의 데크플레이트가 구조재로서 사용이 되어질 수 있도록 합성슬래브의 실험결과를 국제적인 규준식에 의한 계산결과와 비교 검증하였으며 또한 회귀분석을 통해 합성슬래브의 유효단면2차모멘트식을 제안하였다. 또한 데크플레이트 단면요소의 구조적인 특성에 대한 고찰을 위하여 이것을 변수로 하여 유한요소해석을 실시하였다. 합성슬래브 실험은 새롭게 개발한 두 type의 데크플레이트를 사용하여 36개의 시험체를 제작 실험하였으며, 유한요소해석은 3차원 Solid 모델링이 가능한 ABAQUS 프로그램을 사용하여 해석모델링을 개발, 해석을 실시하여 그 결과를 분석하였다.

• Steel and Composite Structures
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• 제13권6호
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• pp.571-586
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• 2012

The paper addresses some key issues related to the design of composite slabs with cold-formed profiled steel sheets. An experimental programme is first presented, involving six composite slab specimens tested with a view to evaluating Eurocode 4 (EC4) provisions on testing of composite slabs. In four specimens, the EC4-prescribed 5000 load cycles were applied using different load ranges resulting from alternative interpretations of the reference load $W_t$. Although the rationale of the application of cyclic loading is to induce loss of chemical bond between the concrete plate and the steel sheet, no such loss was noted in the tests for either interpretation of the range of load cycles. Using the recorded response of the specimens the values of factors m and k (related to interface shear transfer in the composite slab) were determined for the specific steel sheet used in the tests, on the basis of three alternative interpretations of the related EC4 provisions. The test results confirmed the need for a more unambiguous description of the m-k test and its interpretation in a future edition of the Code, as well as for an increase in the load amplitude range to be used in the cyclic loading tests, to make sure that the intended loss of bond between the concrete slab and the steel sheet is actually reached. The study also included the development of a special-purpose software that facilitates design of composite slabs; a parametric investigation of the importance of m-k values in slab design is presented in the last part of the paper.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.467-470
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• 2005

This study was performed to evaluate the static strength of long-span PSC deck slabs. In the previous study, the minimum thickness of PSC deck slabs in the composite two-girder bridge was proposed. To examine the structural behavior and safety of the PSC deck slabs designed in accordance with the proposed minimum thickness, 1/3 scaled PSC deck slabs in the composite two-girder bridge were tested under the static loading. The test results were compared with the predicted values proposed by the code and Matsui. Test results showed ultimate static strength of the PSC deck slabs designed in accordance with the proposed minimum thickness have enough margin of safety. The static failure mode of each test specimen was punching shear mode.

• Structural Engineering and Mechanics
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• 제21권3호
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• pp.295-313
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• 2005

This paper evaluates the effective width of composite steel beams with precast hollowcore slabs numerically using the finite element method. A parametric study, carried out on 27 beams with different steel cross sections, hollowcore unit depths and spans, is presented. The effective width of the slab is predicted for both the elastic and plastic ranges. 8-node three-dimensional solid elements are used to model the composite beam components. The material non-linearity of all the components is taken into consideration. The non-linear load-slip characteristics of the headed shear stud connectors are included in the analysis. The moment-deflection behaviour of the composite beams, the ultimate moment capacity and the modes of failure are also presented. Finally, the ultimate moment capacity of the beams evaluated using the present FE analysis was compared with the results calculated using the rigid - plastic method.

• Steel and Composite Structures
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• 제8권5호
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• pp.361-388
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• 2008

The Eurocode 4 presents some negative aspects in the design of composite slabs by the m-k Method or the Partial Connection Method. On one hand, the component chemical adherence is not accounted for in the connection between the profiled steel sheet and the concrete. On the other hand, the application of these methods requires some fitting parameters that must be determined by full scale tests. In this paper, the Eurocode 4 methods are compared with a method developed at the Federal Polytechnic School of Lausanne, based on pullout tests, which can be a valid alternative. Hence, in order to calculate the necessary parameters for the three methods, several tests have been performed such as the full scale test described in Eurocode 4 and pull-out tests. This last type of tests is of small dimensions and implicates lower costs. Finally, a full-scale test of a steel-concrete composite slab with a generic loading is presented, with the goal of verifying the analytical formulation.

• Steel and Composite Structures
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• 제27권5호
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• pp.647-659
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• 2018

Through extensive research, there exist a new type of connection between railway bridge girders and steel-concrete composite panels. In addition to conventional shear connectors, newly developed blind bolts have been recently adopted for retrofitting. However, the body of knowledge on their influence and application to railway structures has not been thoroughly investigated. This study has thus placed a particular emphasis on the application of blind bolts on the Sydney Harbour Bridge as a feasible alternative constituent of railway track upgrading. Finite element modeling has been used to simulate the behaviours of the precast steel-concrete panels with common types of bolt connection using commercially available package, ABAQUS. The steel-concrete composite track slabs have been designed in accordance with Australian Standards AS5100. These precast steel-concrete panels are then numerically retrofitted by three types of most practical bold connections: head studded shear connector, Ajax blind bolt and Lindapter hollow bolt. The influences of bolt connections on load and stress transfers and structural behaviour of the composite track slabs are highlighted in this paper. The numerical results exhibit that all three bolts can distribute stresses effectively and can be installed on the bridge girder. However, it is also found that Lindapter hollow bolts are superior in minimising structural responses of the composite track slabs to train loading.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2010년도 춘계 학술대회 제22권1호
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• pp.95-96
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• 2010

이 연구는 압출 성형한 ECC 패널과 철근콘크리트로 구성된 합성 슬래브의 균열제어성능을 평가하고 있다. 이를 위하여 ECC를 압출 성형하여 패널로 제작한 후, 그 패널에 현장타설 콘크리트를 일체 타설하여 실규모의 1방향 슬래브를 제작하였고, 그 실험체에 대하여 휨 실험을 수행하였다.

• 한국강구조학회 논문집
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• 제13권3호
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• pp.255-263
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• 2001

구조용 데크플레이트를 사용한 합성슬래브의 파괴형식 중에서 수평전단파괴는 가장 일반적인 파괴형태로써, 본 논문에서는, 데크 춤 60mm인 신개발된 (ACE-DECK) 합성구조용 평데크플레이트를 개발하여 합성슬래브의 전단거동에 관한 실험적 연구를 수행하였다. 실험체는 데크의 형상, 두께 및 콘크리트의 토핑두께를 변수로 하여 총 22개의 실험체를 제작하여 전단부착성능 실험을 실시하였다. 실험결과, 데크의 두께 및 콘크리트 토핑두께에 따른 합성슬래브의 전단부착성능은 크게 영향이 없는 것으로 나타났고, 신형상(ACE-DECK)의 평데크플레이트는 전단부착응력이 $3.6kgf/cm^2$ 까지 나타나 기존의 평데크 형상에 비교하여 효과적인 전단부착성능을 발휘함을 알 수 있었다.

• 한국공간구조학회지
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• 제13권4호
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• pp.6-10
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• 2013