Influencing Parameters on the Load‐bearing Capacity of Composite Dowels positioned close to the free Surface of Concrete Slabs

Broschart, Yannick; Wolters, Kevin; Kurz, Wolfgang; Christou, George; Claßen, Martin

doi:10.1002/cepa.1059

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…The surface of ceramsite is rough, the surface area is large, the bonding force with cement mortar is strong, and it is not easy to produce interface cracks; it is also conducive to the bonding of the combination in the visual environment. Therefore, the performance of the ceramsite material itself determines the strength of concrete 15,16 .…”

Section: Performance Of Ceramsite Concretementioning

confidence: 99%

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

Liu

Xue

Zhao

et al. 2023

International Conference on Computer Application and Information Security (ICCAIS 2022)

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At present, the research work on recycled concrete is still relatively slow and backward, and many problems are not studied in detail enough. It only stays at the material level, and there is no in-depth research on the performance of recycled concrete structures. The purpose of this paper is to study the automatic testing system of ceramsite concrete bearing capacity based on genetic algorithm. A prediction model for the flexural and shear resistance of RC beams after high temperature, and the bearing capacity of RC columns after high temperature, based on BP neural network and GA-BP neural network, was established to prove the effectiveness and efficiency of the automatic test system based on ceramsite concrete bearing capacity accuracy. The overall structure of the system is analyzed, and the following conclusions are obtained: Compared with the BP neural network prediction model, the flexural and shear bearing capacity of the RC beam based on the GA-BP neural network after high temperature and the axial compression of the RC column after high temperature are analyzed. The relative error, absolute error, average error and root mean square of the predicted data obtained by the bias bearing capacity prediction model and the theoretical calculation value are smaller.

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Section: Performance Of Ceramsite Concretementioning

confidence: 99%

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

Liu

Xue

Zhao

et al. 2023

International Conference on Computer Application and Information Security (ICCAIS 2022)

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“…While high stiffness is required from the connectors to minimize the deflection of composite girders, they must also be ductile in order to allow for force redistribution within the composite joint and thus a plastic design. Composite dowels possess both these properties and are therefore favoured increasingly both in building [1][2][3][4][5][6] and bridge [7][8][9][10][11][12][13][14][15][16] constructions. These innovative shear connectors are cut into the steel web or into the flanges of steel girders and positioned within the concrete slab, as shown in an example in Figure 1a or Figure 1c.…”

Section: Introductionmentioning

confidence: 99%

Combined Shear-Tension Loading of Composite Dowels in Cracked Concrete—Experimental Investigations and Design

et al. 2022

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The importance of slim decks has led engineers to the exploration of high-strength materials and also of innovative shallow shear connectors, such as composite dowels in the case of composite constructions. Minimizing the overall slab depth often leads to composite girders being weakened by means of web openings that are necessary for installations such as ventilation ducts. Depending on the geometrical and loading conditions, some of the shear connectors are subjected to a combination of tensile and shear forces. However, the load-bearing behaviour of these connectors has only been rudimentarily investigated in the case of shear-tensile interaction. In addition, the load-bearing capacity of composite dowels under combined tensile and shear forces has not been investigated in cracked concrete. Earlier investigations under pure shear and pure tensile loading indicate a dependence of the connectors’ load-bearing behaviour on the crack width, so that under combined loading, a similar influence is expected. In this paper, experimental investigations on composite dowels in transversely cracked concrete under systematically varied shear-tension loading combinations are presented. Hereby, predefined crack widths and patterns were considered using a special test rig. Finally, a design approach for concrete failure of composite dowels under shear-tension loading is proposed based on the test results.

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“…As an alternative, composite dowels can be used with the rules given in a German technical approval [1]. Existing investigations under monotonic [2], [3], [4], [5], [6], [7], [8], [9], [10], [11] and cyclic loading [12], [13], [14], [15], [16] and regulations on composite dowels include various failure modes of the structure. Specifically, if the position of the composite dowels is close to the concrete surface, as to be seen in Figure 1, an additional failure mode can occur in which the concrete cover at the edge of the concrete slab spalls (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Development of a new design approach for composite dowels positioned close to the concrete surface

Broschart¹,

Kurz²,

Wolters³

et al. 2021

ce papers

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Composite dowels as shear connectors between steel profiles and concrete sections have been investigated for decades. The long‐term aim is to implement a consistent design concept within Eurocode 4 ‐ covering both, the fields of bridge and building construction. Especially in building construction, where the concrete slabs are dimensioned increasingly slimmer in contrast to bridge construction, the composite dowels are positioned unavoidably close to free concrete surfaces. This causes additional failure modes, leading to the overall failure of the structure, which have not been entirely investigated yet. At University of Kaiserslautern more than 30 push‐out tests were performed within a joint research project in cooperation with RWTH Aachen University. These tests were focused on the resistance of composite dowels close to the concrete surface in dependence of varying influence parameters. Some results showed a significant reduction in shear strength and deformation capacity, mostly accompanied by the spalling of the concrete cover. Simultaneously, numerical simulations were calibrated and utilized to get a deeper understanding of the load transfer mechanisms and to interpolate between existing experimental results. On the basis of experimental measurements and numerical simulations a load transfer model was developed with a corresponding design approach to calculate the theoretical resistance.

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Influencing Parameters on the Load‐bearing Capacity of Composite Dowels positioned close to the free Surface of Concrete Slabs

Cited by 3 publications

References 3 publications

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

Automatic testing system for ceramsite concrete bearing capacity based on genetic algorithm

Combined Shear-Tension Loading of Composite Dowels in Cracked Concrete—Experimental Investigations and Design

Development of a new design approach for composite dowels positioned close to the concrete surface

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